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Introduction In aquaculture practises carried out in open environments (e.g. ponds, cages and pens), natural interaction between the culture and non-culture species, where the culture species are been fed by the non-culture species (predation) can occur, causing significant economic loses (Ross, 1988). As many as thirteen different predators are considered to cause loss or damage on salmon farms in Scotland alone among which cetaceans are notable. Seals, sea lions, aquatic birds, dolphins, whales, otters, crabs, starfish, snail, snakes, rats etc are generally considered as predators (SSGA, 1990; Miron et al., 2005), but cetacean species are not notable predators within salmon farms. It is necessary to develop an environment friendly and economically feasible methods or technologies to limit the useless natural interaction. Manual chasing away or removal of predators, usage of scarecrows, anti-predatory nets, covering nets and increasing the tension of nets are some methods used to prevent predations in different aquaculture scenarios. Acoustic Deterrent Devices (ADDs) otherwise called as Acoustic Harassment Devices (AHDs) help to prevent predation as they produce strong underwater noises (sound waves) that disturb and scare off the predators (Gordon & Northridge, 2002). AHDs are comparatively higher energy output devices than ADDs that operate at a power level of above 185 dB re 1µPa @1m. However, as the hearing threshold of different predators differ, the term “ADDs” are generally used for those that are efficient to deter the predators irrespective of their operating power levels (Götz & Janik 2010). One of the first usage of different unspecified sounds (eg: killer whale’s recorded voice) to deter predators (seals) were during the 1970s and no sounds were then found efficient in a long-term run (Anderson and Hawkins, 1988). Later through the 1980s, the precursor of modern ADDs (175-210 dB re 1uPa @1m) that emit out sound waves of frequency range (8-17 kHz), which is similar to the predator’s (seals) most sensitive hearing range were developed (Mate et al.,1987).

Introduction In the face of a burgeoning global population, the imperative for robust advancements in food production, especially within the aquaculture industry, is more pressing than ever. The expansion of this industry necessitates a nuanced consideration of environmental, economic, and social factors underpinned by a commitment to sustainable development. However, the intensification of aquaculture, particularly in coastal regions, poses long-term environmental risks due to increased organic matter in water, demanding innovative solutions. In recent decades, recirculating systems have emerged as a step toward sustainable aquaculture, offering an effective approach to control wastewater. High operating costs have hindered widespread adoption despite their potential, particularly in developing countries. Enter the need for a game-changing, cost effective, and environmentally friendly technology that resonates with farmers on a large scale. This is where the Biofloc system, or Biofloc technology (BFT), takes center stage. A beacon of cost-effectiveness, sustainability, and environmental friendliness, the BFT reduces water exchange to almost zero and slashes artificial feeding ratios. This revolutionary system enhances water quality and generates microbial protein for aquatic species, addressing critical challenges faced by the aquaculture industry.

Sustainability Issues Regarding Major Marine Raw Materials Used in Aquaculture Diets In 2018, more than 70% of the fish production is from fed aquaculture where f ish meals (FMs) and fish oils (FOs) are the main marine raw materials used in aquaculture diets or fish feed (Hua et al. 2019). They are derived or reduced products from the catch of small, pelagic, low-priced marine fish (forage fish) like Peruvian anchoveta that are rich in protein, micronutrient and lipid and are commonly termed as the ‘feed grade marine fishery’ (Bell and Waagbø, 2008; Bendiksen et al. 2011). The whole fish or any other f ish processing by-products are either cooked and then pressed to produce a liquid which on centrifuging produce the fish oil or are dried and crushed into powder-like material which is called as the fish meal (FAO, 2020). FM has the enough balance and concentration of essential amino acids and FO are rich in n-3 essential fatty acids especially eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). FM and FO are the main ingredients in aquaculture diets as they are relatively cheap, readily available, accepted and digested by the fish. The highest amount of these ingredients are often used in feeds for the high value aquatic organisms like carnivorous finfish (eg: Dicentrarchus labrax, Rachycendron canadum) (mostly marine), eels, salmonids, trouts, marine shrimps and freshwater crustaceans (see figure 1) etc. (Houlihan et al. 2001; Halver and Hardy, 2002; Miller et al. 2008) which are mainly imported by prosperous countries adding to good seafood trade value. All the intensive aquaculture production systems like recirculatory aquaculture systems, raceway aquaculture systems, aquaponics, cage culture, shrimp ponds etc are the major end users of the marine raw materials.

With constantly increasing population and need for food security in the present era, an alternate option to safeguard the nutritional well-being of human civilisation is the utmost necessity of the hour. Aquaponics is a system which combines two food-producing systems such as a recirculatory aquaculture system and hydroponics in such a way, that, the waste of one system is utilised in the other system making it a perfect example of the eco friendly model. This system is a soil-less system which can be set up in small vicinity, providing higher outputs. The designs can be changed according to one’s needs, but the main components of the unit should be kept in mind. The main components consist of a fish tank, mechanical filter, biological filter, hydroponics unit along with sump. Although the hydroponics unit are of various kinds but broadly it can be classified into three main types-1. media bed, 2. Nutrient film technique and 3. Deep water culture. If there is a scarcity of land and water or if the quality of soil is poor, usage of aquaponics will be sustainable. Introduction Aquaponics is a combination of hydroponics with recirculatory aquaculture system(RAS) as a single production system. Water with fish wastes coming from the fish tank circulates and passes through the filters, the plant grows on beds and water recycles back to the fish tank in an aquaponic system. At f irst solid waste are removed by mechanic filtration followed by biofiltration for removal of dissolved wastes. Ammonia, which is poisonous to fish, is converted to nitrate, a more readily available fertiliser for plants, by bacteria in the biofilter. The plants absorb nitrate and other nutrients when the water passes through plant growing beds, filtering it prior to its arrival in the fish tank.

Introduction In the 21st century aquaculture has become one of the most important booming industries in the world. With just a mere contribution to the worlds fish production in 1960’s, and able to contribute to about nearly 50% in 2021, production from aquaculture has increased manifolds. Successful aquaculture relies on creating a suitable environment for growth of aquatic animals. Water quality has to be the most important component for successful aquaculture production. Throughout the farming period, it is necessary to maintain good water quality to ensure high survival and fast growth of cultured species. There are numerous water quality parameters that can impact the well-being of fish and crustaceans, most of which are discussed in this chapter. Factors like salinity and water temperature play a critical role in assessing the suitability of a location for the cultivation of specific species. Additionally, factors such as alkalinity, turbidity, phosphorus, and nitrogen hold significance due to their impact on plant productivity, which, in turn, affects aquaculture production. As the cultivation progresses, factors like dissolved oxygen, carbon dioxide, ammonia, and others gain importance, as they have the potential to create stress for the cultured animals. This chapter offers an overview of the presence and behavior of each of these variables in both natural water environments and aquaculture ponds.

Crabs are one of the fast-growing animals from phylum arthropod. Freshwater crabs is now becoming as an important shellfish in freshwater aquaculture production due to its delicacy and nutritional richness. Freshwater crabs are considered good for human consumption and economically important crustacean in many developing countries such as India, China, Nigeria, Japan etc. Freshwater crabs are distributed in the tropical region of the world and they spend their entire lives in freshwater. In Indian territory Western ghats of Maharashtra and north east part of India are considerably more diverse in freshwater crab biodiversity. While only freshwater crab species Barytelphusa cunicularis is commonly observed all over India. In Maharashtra Kolhapur and Konkan region stands out for well-established crab market, driven by high freshwater crab consumption. Freshwater crab serve as good protein food, lipid and cheap carbohydrate source as well as valuable mineral source for human consumption particularly tribal and poor people. Freshwater crab aquaculture, like other types of aquaculture practices, offers a wide range of culture systems, extensive monoculture to intensive monoculture. In freshwater crab aquaculture crab farmers mainly prefers Barytelphusa cunicularis as a culture species.

Introduction The global population is expected to reach 10 billion by 2050, with seafood making up about 15% of the animal protein consumed, averaging 20.2 kg per person in 2020 (Boyd et al., 2022). Due to the overfishing of fish stocks, estimated at 93.8%, aquaculture is seen as crucial to meet future seafood demand (FAO, 2022). Aquaculture offers a promising solution to food security challenges by leveraging our oceans, seas, and freshwater bodies to produce healthy and nutritious food. However, it's worth noting that aquaculture has been linked to the loss of mangroves, with shrimp farming accounting for 38% of historical global mangrove depletion (Friess et al., 2019). Mangrove forests play a crucial role in supporting diverse ecosystems and providing essential services, primarily in tropical and subtropical coastal areas where they thrive in intertidal zones. However, these same areas are often utilized for aquaculture activities, leading to significant mangrove forest conversion. For instance, aquaculture has been responsible for converting approximately 5,44,000 hectares of mangrove forests in eight tropical countries (Hamilton, 2013). To address the challenge of balancing mangrove conservation with aquaculture production, integrated mangrove aquaculture (IMA) has been proposed. IMA involves planting mangroves within or alongside shrimp or f ish ponds. However, it's important to note that mangroves within IMA shrimp systems typically do not provide the same level of biodiversity and ecosystem functions and services as intact mangrove forests.

According to the facts, groundwater salinization and the scarcity of freshwater are indeed expanding. In the coming decades, saline water will replace freshwater as the principal resource for agriculture and aquaculture. Over 8.62 million hectares of land in India and over 397 million hectares of land worldwide have been rendered unusable for traditional agriculture as a result of secondary salinization. Use of salinized land and the water resources for aquaculture is a flexible solution to reduce environmental problem with multiple potential benefits on the economic, social, and environmental fronts. As aquaculture demand has increased, new production methods have been developed. Inland saline aquaculture, here defined as a land-based aquaculture system using saline groundwater and surface water, is practised by a number of countries, including Israel, USA, India, and Australia. The possibility that saline groundwater may differ chemically from coastal seawater is one of the key barriers to the growth of inland saline aquaculture. One must either change the chemistry or choose species that can tolerate the fluctuations to get around this. Several species are farmed or evaluated for their potential including finfish like tilapia, Indian Major Carps, catfishes, climbing perch, Asian sea bass, cobia, milkfish, mullet, and sturgeons. By combining the usage of resources, cultural systems play a significant part in attaining the disruptive technology of inland saline aquaculture. This review revealed the finfish species raised in inland saline resources as well as culture methods such as pond-based, tank-based, biofloc, and aquaponic systems for inland saline aquaculture. One of the cutting-edge food production methods required to boost aquaculture productivity and meet the expanding seafood demand is inland saline aquaculture. In spite of this, inland saline aquaculture has yet to become an industrial-scale and rural business to produce sustainably from unutilized lands.

Introduction Shrimp aquaculture is a rapidly growing sector worldwide due to transform the intensive cultural practices. The demand for shrimp in the global trade market has increased significantly. The commercially farmed shrimp species, Pacific white leg shrimp, P. vannamei, dominate the market compared to tiger shrimp, P. monodon. Achieving higher shrimp aquaculture production often involves employing high stocking densities and large volumes of feed. This intensification can lead to increased waste and the accumulation of toxic substances, resulting in water pollution, requiring costly management measures to address these issues (Liu et al., 2019; Abakari et al., 2021). Therefore, addressing waste management and water quality concerns is crucial for sustaining the productivity and profitability of shrimp aquaculture operations. In addition to these, several other associated problems – decline in available land resources, escalated environmental pollution, the spread of recurring diseases, the emergence of drug-resistant microorganisms, and the impacts of climate change – with the development of shrimp aquaculture were reported (Santos and Ramos, 2018). To avoid these issues, it is essential to regulate and implement sustainable shrimp aquaculture practices that can be achieved through species and system diversification and environmentally sustainable technologies. Adopting these BFT systems allows for a more sustainable and resilient aquaculture operation (Zhao et al., 2016; 2021).

Fisheries management has evolved, acknowledging the intricate connections between individual fisheries, ecosystems, and human activities. Discards, the portion of the catch discarded at sea, have garnered attention due to their significant global impact. Analysing the global research landscape on discards, the USA, Spain, and Australia lead in publications, highlighting the global interest in addressing this issue. This review article explores the reasons for discarding, its consequences, and the subsequent fate of discarded catch. Discards result from factors like economic considerations, fishing regulations, and storage constraints. The aftermath of discarding involves various outcomes; the survivability of discarded fish varies, with high mortality observed in small fishes and those with gas bladders, death, or being used as bait. The timeline of discards, spanning from the 1970s to the present, reflects the increasing awareness and international efforts to address this issue. In 2019, the estimated annual global discards were 10.5 million tonnes, recorded significantly in the northwest Pacific and southwest Atlantic regions. This review article delves into gear-wise and species-wise discards, revealing variations in discarding practices across fisheries. The Indian scenario highlights the decline in discards, especially in shrimp freezer trawlers. The decline in discards is attributed to changes in fishing technologies such as bycatch reduction devices, management actions like discard bans, quantifying the economic disincentives due to discards, and societal attitudes that aim to mitigate discards. Regulations and initiatives worldwide, assessing discards in fisheries is crucial for sustainable resource utilization, as depicted in a flowchart illustrating the necessity of such assessments. In conclusion, reducing discards contributes to healthier ecosystems, sustainable fisheries, and long-term global food security, calling for continued efforts to minimize wasteful practices in fisheries, this article emphasizes the need for responsible fishing practices.

Introduction Tumaria wetland (29° 18' N & 78° 57'E) is a manmade wetland near Corbett Tiger Reserve, Nainital district, Uttarakhand (Figure 1). It was constructed in the year 1961 and has an average depth of 3.1 m. It was mainly used for irrigation, fish production and has been a favorite place for several migratory birds during winter season (Bhattacharjee and Bargali, 2013; Bhattacharjee,2014). Tumaria bears a humid subtropical climate; emprises hot and dry summer which commences from early October to the mid of June. The area experience wet season from the mid of June to early October and then feels the cold winter. The reservoir catchment area is 284.16 sq. km and its north area is covered with thick, reserved forest of Jim Corbett National Park (Figure 2). The infestation of Salvinia weed is one of the major problems being faced by this wetland. The exotic free-floating weed, Giant Salvinia (Salvinia molesta Mitchell), belongs to Salviniaceae family and is a native of south-eastern Brazil (Forno, 1983). It is commonly known as water fern, water weed, Kariba weed or water spangle and African payal in India (Jones, 1987). During the past 50 years, it has widely extended throughout the world and has infester the areas of Australia, New Zealand, Africa, southern USA, the Indian subcontinent, south-east Asia and some Pacific islands (Thomas and Room, 1986) (Figure 3). In India, it was f irst established in the state of Kerala since early 1970s (Cook, 1976; Thomas, 1976 and 1979). This aquatic weed has invaded in various aquatic habitats, such as lakes, wetland, rivers, reservoirs and paddy fields.

Introduction The biology is the study of life forms, subdivided into a variety of specialist categories that include their morphology, physiology, anatomy, behavior, origin, and distribution.The conservation of endangered species is often equated with the preservation of biodiversity by people all over the world. Although endangered species are among the most obvious and understandable markers of the continual loss of biodiversity, ecologists are aware that biodiversity involves much more than just endangered species. An increasingly popular and crucial component of initiatives to preserve the ecological diversity of the planet is the protection of such species. Endangered species Endangered (EN): A taxon that is not critically endangered but facing a very high risk of extinction in the natural environment in the near future, it is considered to be endangered. The important criteria are 1. A decline of at least 50% over at least 10 years or three generations that has been observed, estimated, inferred, or suspected. 2. Population thought to consist of no more than 2500 mature individuals.

Introduction Because of their incredible diversity of life and amazing distinctiveness, coral reefs are frequently referred to as the "Tropical Rainforests of the Sea". Reefs are vast biological treasure troves that provide millions of people throughout the world with a variety of economic and environmental services. Corals are useful and beautiful things that are members of the phylum Anthozoa. The massive reefs that are only visible at low tides are built by hermatypic corals and their symbiotic zooxanthellae. Corals are only found in the ocean and, taxonomically speaking, are part of the scleratinia order. The solitary forms, known as ahermatypes, are both solitary and colonial and lack symbionts. Corals that form reefs are actively growing in the ocean's photic zone. Around the world, a belt of coral reefs can be seen in the tropical waters. Coral reefs are of immense importance, but due to both natural and man-made influences, they are rapidly degrading and disappearing at an alarming rate. By 2030, 90% of the reefs would be in danger if current rates of erosion are permitted to continue. It is crucial to comprehend the coral reefs' current state of health and the growing dangers to them. The study's goals are to examine management and conservation strategies and shed knowledge on the expanding issue of coral exploitation (Jhajhria, 2021).

Introduction In 1952, the classical theory of survey sampling neared completion. In 1952, Horvitz and Thompson created a general theory with an aim to create objective estimations. As Horvitz and Thompson completed the Classical theory, the random sampling strategy was mostly agreed upon. The majority of the great books on sampling were written by numerous authors. (Yates, 1949; Deming, 1950; Hansen, Hurwitz, and Madow 1953; Cochran et al., 1953). Why Sample? • Particularly in fisheries, it is impractical to count every single specimen. • Sampling gives a depiction of an organism's abundance and dispersion. • A sufficient number of samples must be used to ensure that the results are accurate representations of the condition. Notwithstanding the fact that the sample is considered to be the credible and representative of the population and that the data shows accuracy, the sample may not accurately reflect the system's real population. As a result, sampling introduces a mistake. • Sampling error is the statistical error showing the difference between the values derived from the sample of a population and the true values of a population parameter when all the units in the population are counted in the same way that the sample is counted.

Introduction Plastics has the versatile properties like light weight, durability, less expensiveness, and it is readily available for the consumers usage. Due to these diverse properties, the usage of the plastics is increasing day to day and their production has been increased drastically in the past 50 years (Cressey, 2016). At present, global plastics production has reached to 159 million tonnes. This diversified consumption has led to the production of enormous amount of plastic waste (Hahladakis et al., 2018) and their properties allows for long range transport in the ocean (Baalkhuyur et al., 2018). According to the Earth Action reports, nearly 68,64,299 tonnes of plastic waste will end up in nature due to imbalance between the plastics consumption and production. India is among 12 countries responsible for 52 % of the world mismanaged plastic waste (Plastic Overshoot Day: Report 2023). Marine litter occurrence and impacts are common in worldwide marine systems (Bhattacharya and Khare, 2019) and they are degraded into micro sized particles called microplastics through a various physical, chemical and biological processes such as U-V light, wind and ocean currents (Solomon and Palanisami, 2016). Microplastics are < 5mm in size and are further divided into large and small microplastics of size 1–5 mm and 20 µm–1 mm, respectively (Loder and Gerdtz, 2015). Microplastics are classified into 2 categories: i) primary microplastics, intentionally produced as small sizes, used in cosmetics, microfibers from clothing, fishing nets, and their shape, size, colour, and chemical composition may vary depending upon the products. ii) Secondary microplastics are the tiny particles including fibres, fragments formed by the degradation or breakdown of larger plastics particles due to the UV rays from sunlight oxidation process. These particles are generated from the plastic films, accidentally or intentionally discarded fishing ropes and nets, plastic bottles and plastic bags etc. (Andrady, 2011).

Introduction ''Sewage, also known as domestic or municipal wastewater, is produced by communities of people. It is characterized by its volume or flow rate, physical condition, chemical and toxic constituents, and bacteriological status. Sewage primarily consists of greywater (from sinks, tubs, showers, dishwashers, and clothes washers) and blackwater (water used to flush toilets, combined with human waste)." The four primary types of wastewater are domestic, industrial, agricultural, and urban. Domestic wastewater comprises black water containing human and animal feces, along with gray water from household tasks such as bathing, washing, cooking, and gardening. Industrial wastewater consists of industrial byproducts like pulp, paper, petrochemical runoff, chemicals, salts, and acids. Agricultural wastewater originates from agricultural practices, contaminated groundwater, and farming methods, particularly those involving fertilizers and pesticides. Urban wastewater is a blend of domestic and industrial wastewaters, compounded by sewage infiltration and rainwater.

Introduction India has a coastline of 8,118 km, with an exclusive economic zone (EEZ) of 2.02 million sq km and a continental shelf area of 3,72,424 km², spread across 9 maritime States and seven Union Territories, including the islands of Andaman and Nicobar, and Lakshadweep. India represents 2.5 percent of the world’s landmass and supports a population of over one billion people. India is also one of 17 mega-biodiverse countries in the world, with 7.8% of the recorded species of the world, including 45,500 recorded species of plants and 91,000 recorded species of animals. The marine ecosystem is extremely diverse, attributed to the geomorphologic and climatic variations along the coast. The coastal and marine habitat includes near shore, gulf waters, creeks, tidal flats, mud flats, coastal dunes, mangroves, marshes, wetlands, seaweed and sea grass beds, deltaic plains, estuaries, lagoons and coral reefs. Importance of Study The detailed studies on the coastal and marine biodiversity of the Indian mainland are lacking, and so these habitats and the biodiversity are represented poorly. It is obvious that the biodiversity is distributed widely among different associated habitats and conserving a single area would never support all the important species and ecological processes worth protecting. Furthermore, biodiversity can only be conserved by preventing habitat loss and by restoration. The importance of any single species in the functioning of an ecosystem may not be high, but protection of a mosaic of habitats will certainly preserve diversity among the species of conservation importance. Also, to achieve the Biodiversity Aichi Targets with reference to the marine environment are to preserve ecologically sensitive areas and maintain the health of the marine environment by protection, sustainable use and conservation of marine living resources.

Introduction Plastic is the main component of environmental pollution, as it is continuously disposed of into the environment in substantial quantities. Since the creation of the first plastic polymer in the mid-twentieth century, plastic production has increased dramatically, from 1.5 million tons in 1950 to 280 million tons of plastic produced in 2011, with an annual growth rate of 8.7 % (Europe, 2017). By the 2050s, humans are expected to generate 26 billion tons of plastic waste, four times the current levels of plastic waste globally. Due to this serious concern, the United Nations has prioritised plastic waste and its management as one of the fundamental environmental concerns in its 2030 Agenda for Sustainable Development. Plastics appear in the environment in visible and invisible forms. The visible form refers to common scenes, such as bags “flying” on tree branches, PET bottles floating in rivers, lakes, and seas or face masks we use daily. The visible form of plastic in the environment is an aesthetic mockery and a reminder of the socially indiscriminate reception of all offers from the petrochemical industry. The invisible form of plastics is called nanoplastics.

Introduction The production of seaweeds in 2018 is about 36 million tonnes were produced from the dominated by the species Japanese kelp, Laminaria japonica followed by Eucheuma spp mostly originated by mariculture (SOFIA, 2022). In India seaweed are widely present in the Gulf of Mannar in the Tamilnadu and Gulf of Kutch in Gujarat coastal region. Parallelly the work on the seaweeds is also unrestricted in India, being top in the area of research especially in their bioactive compounds(Fig.,1). Since the age of ancient Egyptians to our current generation, peoples towards the beauty conscious unrestricted. Currently the exposure of e-commerce platform to the all-aged groups makes them the urge to buy more beauty enhancing products. From the film stars, whom it’s their main line of work to the people it doesn’t costs any financial income the role of cosmetics is unavoidable. Though it’s not providing any physical health, the emotional sanity enduring self-confidence is one of the principal reasons. And so the beauty industry is considered as the a dynamic segment that is ripe for disruption and the well-known actors are their key for its premiumization. Nowadays peoples are concern about their health along with beauty which leads to many companies investing in green and ecofriendly cosmetic product development. Seaweed is one among them. Seaweeds are marine macro algal species includes Chlorophyceae (green algae), Rhodophyceae (red algae) and Phaeophyceae (Brown algae) grown along the seashore which get differentiated based on the presence of carotenoids like chlorophyll, phycobiliproteins, fucoxanthins, beta carotene and so on. The presence of versatile bioactive compounds like diterpenes, proteins, antioxidants, flavonoids, phenols and especially polysaccharides (sulfated and non-sulfated) associated with seaweed makes them a good alternative to the synthetic cosmeceutical industry by producing novel beauty products (Couteau & Coiffard, 2016).

Introduction Revolutionary makeovers have happened in the fisheries, from traditional f ishing practices to the FAD and so on. However the introduction of trawlers had made a huge impact on the marine ecosystem. As trawling is made for catching the bottom dwelling shrimps, but one of the untargeted catch in trawling is Squid. As the squids gained an important role in the export market, the demand for the squids is being increasing inevitably. In response specialised fishing practices called Squid Jigging directly targeting squid resource in parallel minimised the harm on other Marine resources. The frozen and dried squids are extensively exported from the India since 1973and now it ranked fourth in terms of quantity and economic value (CMFRI). In the year 2020-22 The total f ish production of India was about 162.48 lakh tonnes in which the marine and inland sectors contributed about 41.27 and 121.21 lakh tonnes respectively (Handbook of fisheries statistics, 2022), In That the bulk of the squid landing comes from the west coast (0.28 lakh tonnes) from landed, which mostly dominated by Karnataka and from the east coast (0.12 lakh tonnes) the catch is dominated by Tamilnadu followed by Odisha. Even though a considerable amount of squid catch is obtained as the by-catch from the trawl nets, but the primary catch comes from squid jigging.

Introduction Seaweeds, also known as marine macroalgae, grow in intertidal zones to deep sea environments. Based on their pigmentation, seaweeds are classified into three groups. They are red (Rhodophyta), green (Chlorophyta), and brown (Phaeophyta). Seaweeds are the primary producers in marine ecosystems; they also contribute to carbon fixation, nutrient cycling, reducing wave energy, preventing coastal erosion, and oxygen production. The complex, three dimensional growing nature of seaweeds helps habitat marine flora and fauna. Seaweeds are consumed as food in many countries, particularly in Asia due to their high nutritional content. Along with their nutritional value, they contain bioactive compounds with potential pharmaceutical and cosmetic applications. Agar and alginate from seaweeds are used in the food and pharmaceutical industries. Seaweeds are integral part of marine ecosystems. Chemical pollutants including pesticides can disrupt these ecosystems by harming their populations, which directly or indirectly affect the marine environment. seaweeds are not only essential components of marine ecosystems. They are also consumed directly or indirectly in various food products (e.g., sushi, soups, and salads). The pesticides in the marine environment absorbed by seaweeds and bioaccumulate in the food chain. Seaweed cultivation is an emerging sector worldwide. The applications of seaweeds are food, pharmaceuticals, cosmetics and biofuels production. Seaweeds contaminate with pesticides leads to economic loss and reducing market demand. Manu of the seaweed consuming countries have safety limit for pesticide residues in food products, including seaweeds. The presence of pesticides in seaweeds also helps the development of risk assessment and management strategies including source identification, exposure pathways, and mitigating measures. The monitoring of pesticides in seaweeds provides the contamination levels over time, which helps to identifying the emerging issues, assess the effectiveness of regulatory measures, and guide adaptive management strategies.

Introduction The integration of the Internet of Things (IoT) into the fisheries sector repre sents a significant advance toward modernizing an industry critical to global food security and economic stability. This chapter highlights the comprehensive exploration of the role of IoT technology in fisheries, its applications, implications and the challenges faced by fish farmers in adopting it. Background and Context of IoT in Fisheries Sector The fisheries industry, with its complex web of marine ecosystems and global supply chains, has long been characterized by fundamental interactions between humans and the environment. As the global population grows and consumer demand for seafood increases, the need for sustainable, efficient and technologically advanced fishing practices is becoming increasingly important (Prapti et al., 2022). This is where IoT introduces an innovative range of devices and solutions to meet the emerging demands of the sector. Overview of IoT Applications in Fisheries IoT technology opens up a box of possibilities in the fisheries sector. Real time monitoring of marine conditions, vessel tracking and fleet management, aquaculture optimization, supply chain management and predictive analytics are among the primary applications explored in this chapter. By analyzing these applications, we show how IoT increases the efficiency and sustainability of the fishing industry.

Contemporary tilapia cultivation is aligned with the principles of circular bioeconomy, aiming to minimize resource inputs while maximizing waste and effluent reuse. This strategy involves closing the loops of various economic and ecological resources as well as decentralizing the production systems for localized production and consumption. Growing concerns about disease outbreaks along with market demands for environmentally responsible and sustainable aquaculture practices are propelling a transformative shift. This shift is characterized by structural advancements in water and effluent reuse through closed-loop recirculation systems that repurpose waste as valuable nutrients. Today one of the pivotal trends in tilapia farming is the adoption of circular bio-economy principles which is exemplified by diverse recirculation systems including Biofloc Technology (BFT), Partitioned Aquaculture Systems (PASs), Recirculatory Aquaculture Systems (RAS), bio RAS, , In Pond Recirculation Systems (IPRS) and Integrated Multitrophic Aquaculture (IMTA). The trajectory of tilapia culture often aligns with the trajectory of urban agriculture as well as waste fermentation. Low-demand water recirculation systems are poised to spearhead a disruption in industries across five key sectors (material, information, energy, transport, and food/ health) that rely heavily on extraction. This transformation is driving the transition towards a more sustainable and localized model.

Introduction In a world often characterized by competition and individualism, co-operatives emerge as unique entities that prioritize unity, shared goals, and collective well-being. Co-operatives, also known as co-ops, are voluntary associations of individuals who come together to address common needs and aspirations through collectively owned and democratically governed enterprises. Rooted in principles of collaboration, inclusivity, and mutual support, co-operatives play a vital role in various sectors, including agriculture, finance, consumer goods, and social services. Their essence lies in creating a platform where people can pool resources, skills, and efforts to improve their economic, social, and cultural conditions. At the heart of the co-operative philosophy is the belief that by working together, individuals can achieve more than they could on their own. Co-operatives are not driven by profit-maximization but by the desire to meet the needs of their members while fostering a sense of community and empowerment. Whether it's farmers joining forces to access better markets, consumers forming buying clubs to obtain affordable products, or workers creating businesses to share ownership and decision-making, co operatives embody the principle of "people helping people."

Introduction The population pressure, economic expansion, and dietary changes have all led to the rise in demand for foods with animal origin. On the other hand, the fishing industry has a lot of opportunity to close the supply and demand imbalance. The average global per capita consumption has climbed to 20.3 kg, with Asia accounting for about 91.6% of the world's supply of aquaculture fish. Most of this fish is consumed domestically (FAO, 2022). India produced 14.16 million tonnes of fish in 2019-20. Across the region, per capita consumption varies significantly ranging from 63 kg/year in the case of Japan (Delgado et al. 2003) to only 5-6 kg/year in India where only one-third of the population are f ish-eaters (Dey et al. 2005). As you know fish consumption rate is increasing day by day because it contains high protein, Omega-3 polyunsaturated fatty acids {Docosahexaenoic acid (DHA) and Eicosapentaenoic acid (EPA)} which is expected to have huge health benefits. Although the supply and demand for different species vary, the Indian major carp (IMC) predominates in satisfying the nation's demand for fish. With a diverse population of around 1.3 billion to feed, knowledge of demand and supply is necessary especially in fisheries sector. Since, fish is a perishable commodity its supplying is a tough task to accomplish. Before studying the demand and supply firstly we have to focus on what is ‘Need’ and ‘Want’.

Introduction Seafood demand has grown over the years due to its numerous nutritional advantages, acting as a primary contributor to global nutritional security, and the industry supports the livelihood of several million people. Persistent growth in demand for animal protein keeps the fisheries and aquaculture an important role. The average annual seafood demand growth across countries varies between 6 % and 7.5% (Kidane et al., 2021). Hence, Increased fish production, increased the per-capita fish consumption of the respective country (Garlock et al., 2022). Global average fish consumption has increased from 9.9 kg in 1961 to 20.5 kg in 2019 (FAO, 2022). The coastal countries of Iceland and Maldives are leading in per capita fish consumption with 92 kg and 85 kg respectively. While, landlocked countries such as Afghanistan, Ethiopia, and Tajikistan are the least in per capita fish consumption with less than 1 kg of fish per annum. The leading fish producers China (39 kg) and India (6.8 kg) positioned 7th and 15th place respectively in 2019 (World Economic Forum, 2022). India plays a significant role in export as like production with a global share of 5.2 % after Norway (10.4 %) and China (8.6 %). Shrimp is the primary commodity of export in India’s seafood basket with a share of 25 % of the World’s shrimp export next to Ecuador (44 %) during 2021-22. Frozen f ish is the second largest exportable item of India’s seafood export which contributed 22 % in quantity and 8.6 % in earnings next to frozen shrimp with 41 % in quantity and 67 % in export earnings. Followed by frozen cuttlefish & squid and dried items had an export share of 9 % and 5 % respectively during 2022-23 (MPEDA, 2023). Shrimp farming in India is also extending from 1.17 lakh hectares during 2010-11 to 1.67 lakh hectares during 2020-21 in India with production of 1.3 lakh tons to 8.4 lakh tons of shrimps respectively to meet the trade advantage.

Introduction Aquatic habitats are essential to preserving the delicate balance of life in the complex web of ecosystems that make up our world. We must investigate novel and sustainable strategies to maintain the health and vigour of aquatic species because we are the custodians of these delicate ecosystems. In the course of this endeavour, an intriguing chapter titled "Green Medicine for Aquatic Wellness: Phytotherapy as a Promising Approach to Fish Health Management" is presented. A world filled with different aquatic life exists within the glittering depths of our lakes, rivers, and seas. Each species is a vital component of the aquatic ecology, from the colourful tropical fish that adorn coral reefs to the hardy creatures that live in freshwater streams. The peace of their environments might be disturbed by a number of diseases that these animals are prone to, just like any other living thing.

Introduction Aquaculture stands as the swiftest expanding sector within the food industry, with an escalating per capita consumption of fish-derived animal protein. India, as the world's third-largest fish producer, contributes significantly to this trend, boasting a fish production of 16.24 million tons, which corresponds to 8% of the global fish production. Nevertheless, several challenges persist and must be addressed, including the absence of species-specific or functional feeds, the dearth of genetically modified strains or breeds, the availability of high-quality fish species, and the rising incidence of fish diseases. Recent strides in "omics" technologies have furnished a potent toolkit and conceptual framework that enables the comprehensive dissection of the phenotypic and functional networks of genes and proteins within cells or organisms (Mohanty et al., 2019). This innovative research domain has spawned technological advancements that harness the power of "omics" to scrutinize diverse biological systems (Ning and Lo, 2010). The integration of "omics" in aquaculture research has effectively surmounted numerous challenges related to production and reproduction, thereby ensuring its relevance and economic viability. This technology empowers researchers to analyze an array of molecules on a massive scale, marking an early and groundbreaking technological leap forward in this field.

Introduction Aquaculture, involving the cultivation of fish, crustaceans, molluscs, and aquatic plants, has become indispensable for global food security and employment. However, the intensification of aquaculture practices, characterized by high stocking densities, has led to increased stress among farmed organisms, which in turn makes them more susceptible to diseases. Disease outbreaks in aquaculture can have devastating effects, necessitating both prophylactic and therapeutic measures to maintain the health and productivity of these organisms. Prophylactic measures, such as vaccines and immunostimulants, play a vital role in preventing disease outbreaks. For instance, vaccines targeting common bacterial pathogens like Aeromonas hydrophila are widely used in fish farming. Immunostimulants like beta-glucans are also administered to enhance the immune response of aquatic organisms. On the therapeutic front, antibiotics remain the most commonly used agents to treat infections once they occur. However, the extensive use of antibiotics has led to several significant issues. Firstly, antimicrobial resistance (AMR) has emerged as a major concern, with the excessive use of antibiotics in aquaculture contributing to the development of resistant bacterial strains. These resistant pathogens can spread to other aquatic organisms and humans, posing a serious public health risk. Secondly, the presence of antibiotic residues in seafood can lead to export rejections, as many countries enforce strict regulations on such residues. This can result in considerable economic losses for aquaculture producers. Lastly, residual antibiotics in seafood can cause allergic reactions in consumers and contribute to the emergence of antibiotic-resistant infections.

Introduction The organism’s defence against infection is provided by the intricate network of organs, cells, and proteins that make up the immune system. In general, there are two types of immunological responses seen in vertebrates: the innate and adaptive immune systems. Innate immunity is the first line of defence against any foreign molecule or pathogenic invasion. Innate immunity can be classified into physical barriers, cellular and humoral factors. The physical barriers such as scales, skin, gill, gastrointestinal tract and mucus are used to prevent entry of pathogens into the body. Fish mucus contains different enzymes, complement proteins, antimicrobial peptides and IgM that are efficient in trapping and killing of pathogens (Magnadóttir B. 2006). Cellular components of an innate immune system include a variety of immune cells like macrophages, neutrophils, opsonins, lymphokines, natural cytotoxic cells, eosinophils, basophils, mast cells, eicosanoids and cytokines. They play different roles in innate immunity with their own specific pathways to prevent pathogens in the host body. Humoral factors include growth inhibitor proteins like transferrin, interferons, enzyme inhibitors, lysin, C-reactive proteins, lectins and lysozymes (Secombes and Belmonte, 2016; Roberts, 2012).

Introduction In the past few decades, the shrimp aquaculture industry has become an increasing disease challenge, impacting huge economic losses and sustainable development. Viruses, bacteria, and microsporidian parasites are major pathogens that threaten shrimp healthcare and currently, antimicrobial resistance (AMR) pathogens, and fungi have emerging diseases in the shrimp industry worldwide. Naturally, invertebrate crustaceans, including shrimp, depend on nonspecific immune responses mainly involved by haemolymph and hemocytic cells. A cellular immune process involving phagocytosis, encapsulation, nodulation, and prophenol oxidase leads to melanin synthesis and humoral responses such as secretion of clotting protein, enzyme inhibitors, antioxidant enzymes and antimicrobial peptides for killing or resistance against invading pathogens. Antimicrobial peptides (AMPs) are evolutionary conserved small peptide molecules ubiquitously found in all living organisms. AMPs are an integral part of the innate immune system in various organisms. These peptides have a broad spectrum of inhibitory effects against bacteria, viruses, fungi, and parasites. Shrimp AMPs are short, molecular weight of less than 13 kDa, possess diverse structures, sizes, and biochemical features, and have an amphipathic structure with cationic or anionic properties that selectively target the negatively charged membranes of microbes.

A Acoustic Deterrent Devices (ADDs) 2 Activated Sludge 261, 263, 264, 332 Aquatic Mammals 4, 8 Aquaponics 25, 37, 38, 39, 40, 41, 43, 44, 45, 46, 47, 87, 95, 335, 336, 337, 338 Anti- Aging 285, 287 Antimicrobial Peptides (AMPs) 139, 428, 429, 430, 431, 437, 439 Antimicrobial Resistance (AMR) Pathogens 428