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"Aquatic Ecosystem of Cold Region" is a comprehensive exploration of the diverse and dynamic aquatic resources that define the unique landscape of the Kashmir region. This book delves into the rich tapestry of fish species, their habitats, and the intricate relationship between the aquatic ecosystems and the local communities that have relied on them for generations. Through sixteen captivating chapters, the reader is taken on a journey that unravels the complex web of factors shaping the fisheries sector in Kashmir. From the biology and ecology of iconic species like the Schizothoracinae and Salmonid fishes to the impact of climate change and the introduction of exotic species, this book offers a well-rounded understanding of the challenges and adaptations necessary for the sustainable management of these precious resources. The book also sheds light on the traditional fishing practices, gear, and crafts that have been passed down through the ages, providing a glimpse into the rich cultural heritage that is inextricably linked to the aquatic life of the Kashmir Valley. Furthermore, the exploration of sports fisheries development and the associated socio-economic benefits underscores the multifaceted role of fisheries in the region. Ultimately, "Aquatic Ecosystem of Cold Region" is a testament to the remarkable diversity and resilience of the aquatic ecosystems in this trans-Himalayan region. It serves as a valuable resource for researchers, policymakers, and all those who are invested in preserving the delicate balance between human activities and the natural world. Through its forward-looking perspective on sustainable management and conservation strategies, this book paves the way for a future where the fisheries of Kashmir can thrive in harmony with the needs of the local communities and the ever-changing environmental landscape.

Introduction Fish and fisheries play a significant role in Kashmir's economy and people's livelihoods. Kashmir abounds with water bodies the lakes, rivers, and streams run the course to produce a favourable environment for numerous species of fish. Apart from the natural water bodies, fish farming has also emerged significantly in Kashmir, where several small-scale fish farmers are engaged in the fish rearing and fisheries activity in ponds and race ways, both for commercial and subsistence purposes (Islam, 2020). The fish farmers do more than just contribute to local food supplies; they also provide money and work for people locally. However, the fish and fisheries sector of Kashmir is faced with various challenges. The challenges range from overfishing, Exclusively Distributed by NIPA GENX Electronic Resources and Solution Pvt. Ltd. New Delhi environmental degradation, and pollution to the lack of infrastructure for fish handling and processing and climatic change. Despite all odds against this sector, the government and other agencies/organizations are trying their best to achieve sustainable management and development of fisheries in Kashmir. Moreover, full- and part-time work by fish farmers and fish workers, seasonal or occasional, supplement thousands of livelihoods with additional income in the sector's activities (Qayoom and Bhat, 2015). Most of those engaged in small-scale fisheries and aquaculture in Kashmir are self-employed, hence directly contributing towards food security within their households and communities. Due to the ever-increasing demand for protein-rich food, the production of fish has elevated around the world. According to the Food and Agriculture Organization, fish production attained 179.2 million metric tons in 2020, which is valued at USD 345 billion (FAO, 2020). This shows a large increase from the years of the 1990s when world fish production was 100 million metric tons. Fish Production of India Trends in fish production of India indicate a continuous rise of an annual average growth rate of 8.61% over the period from 2014-15 to 2021-22 (dof. gov.in). It is due to inland fisheries, which contributes around 75 percent of the total fish production in the year 2021-22, while the remaining 25 percent is from marine fisheries (dof.gov.in). Value-wise, the country's fish production has also had a massive outflow in exports, touching US$ 8.09 billion in FY 2022-23 (Handbook of fisheries statistics, 2023).

Introduction The Trans-Himalayan region, often known as the Tibetan Plateau, is a vast region of Central Asia that is covered with high altitude topography. This enormous and untamed terrain, with its lofty peaks, wide plateaus, and profound valleys, is fundamental in determining the biodiversity and climatic patterns of the surrounding area. Geographically speaking, it includes portions of the Tibetan Autonomous Region (TAR), Ladakh (India), and Tibet (China), among other places, making it a varied and culturally rich region. The Trans- Himalayan region, with an average height of 4,500 metres (14,800 feet), is sometimes referred to as the "Third Pole" because of its large ice fields and glaciers, which hold enormous amounts of freshwater that are essential for areas downstream. Major rivers like the Indus, Brahmaputra, and Yangtze, which supply water to millions of people in South and East Asia, are fed by these glaciers (Xu et al., 2009). The harsh climatic conditions in the area present special possibilities as well as problems for the local population and fauna. Extreme weather, such as low oxygen levels and frigid temperatures, have prompted the emergence of specialised plants and animals that are suited to these high-altitude environments. For example, the Tibetan Plateau is home to famous animals that flourish in its harsh environment, including the Tibetan antelope (Pantholops hodgsonii) and the snow leopard (Panthera uncia) (Zhao and Guo, 2020). Furthermore, indigenous people have established traditional livelihood practices tailored to the severe circumstances of the Trans- Himalayan area, which carries considerable cultural and spiritual significance for them. These communities depend on the freshwater ecosystems and other natural resources of the area for agriculture, subsistence farming, and cultural activities (Immerzeel and Droogers, 2018). Geography and Climate of the Trans-Himalayas The Trans-Himalayan region is a large high-altitude territory situated north of the Greater Himalayas. It is also known as the Tibetan Plateau or the Roof of the World. At an average elevation of 4,500 metres above sea level, this plateau, which spans more than 2.5 million square kilometres, is among the tallest and biggest in the globe (Shi et al., 2019). This region is distinguished by its vast plains, mountain ranges like as the Kunlun, Karakoram, and Pamir, and a complicated network of mountains.

Introduction The Kashmir Valley, located on the northern side of the Indian subcontinent, is renowned for its stunning aquatic habitats, integral to its biodiversity and cultural heritage. The state is endowed with natural water resources Exclusively Distributed by NIPA GENX Electronic Resources and Solution Pvt. Ltd. New Delhi encompassing a total water spread area of about 0.40 lakh hectares (Department of Fisheries, Government of Jammu and Kashmir). These resources exist in the form of fast-flowing cold-water streams, lakes, rivers, marshes, springs, and high-altitude lakes. These waters hold great potential for the development of various types of fisheries, including cold water fisheries, warm water fisheries, sport fisheries, and reservoir fisheries (Department of Fisheries, Government of Jammu and Kashmir). The data outlining the fishery resources of Jammu and Kashmir is presented in (Table 1). The state is blessed with the presence of significant rivers, namely the Indus, Jhelum, Chenab, and Ravi (Shukla and Ali, 2018). Indus originates from Lake Mansarovar at an elevation of 5100 meters in the Himalayas and flows diagonally toward the northwest (Ahmad and Rais, 1998). Jhelum, another important river, originates from a spring at Verinag, which lies northeast of Anantnag Town. The river flows through the city of Srinagar and the towns of Sumbal, Sopore, and Baramulla (Raina, 2002). The third major river in the state is the Chenab, which originates from the Himalayas. The lakes of the Kashmir Valley are surrounded by the majestic Himalayan Mountains (Romshoo et al., 2020). These lakes are invaluable natural water bodies housing a diverse gene pool. The valley boasts numerous lakes and wetlands at varying altitudes, categorized as high-altitude lakes (such as Gangabal, Vishan Sar, Kishan Sar, Sheesh Nag, Nilnag, Kauser Nag, etc.) and valley lakes (including Wullar, Dal, Manasbal, Aanchar, Ahansar, Hokersar, Haigam, etc.). The main factors contributing to the degradation of the lakes include indiscriminate cutting of surrounding vegetation, leading to increased silt and nutrient accumulation in the lake. Additionally, the disposal of sewage and domestic waste, along with the excessive use of pesticides and insecticides in the surrounding areas, and agricultural practices utilizing agrochemicals have been identified as significant contributors (Jamal et al., 2022; Kumar et al., 2022).

Introduction Understanding the diversity, distribution, and habitat preferences of fish species is crucial for devising effective conservation strategies for fisheries resources. Fish distribution patterns are influenced by factors such as dispersal mechanisms, environmental tolerance, and historical factors, while aquatic organisms are directly impacted by variables like climate, land use, geological features, vegetation, topography, and water chemistry fluctuations (Carter et al., 1980; Wiley et al., 1997). Fish represent the most abundant class of vertebrates, comprising nearly half of all vertebrate species globally, with diverse characteristics in terms of size, biology, morphology, and habitat preferences (Kour et al., 2015). Freshwater ecosystems, which account for 68.7% of the world's cold water fisheries, are particularly significant, especially in regions like the Himalayas, where they support vital aquatic life and offer economic opportunities through aquaculture (Fricke et al., 2023). Cold water fish species, predominantly belonging to the Cyprinidontiformes order, are particularly abundant and important in these ecosystems (Fricke et al., 2023). The biological diversity of the planet, including its freshwater ecosystems, has long been a subject of fascination and study (Joshi et al., 2013). India is ranked ninth in the world for freshwater biodiversity, with over 2,500 fish species, 930 of which are unique to freshwater environments. India has been recognized as one of the mega-diversity countries of the world (Mittemeier and Mittemeier, 1997; Jayaram, 2010). The Himalayan region alone contributes approximately 17% of India's fish population (Ghosh, 1997). This chapter aims to comprehensively understand the diversity, distribution, and habitat preferences of fish species in the Kashmir Valley. By examining key factors influencing fish distribution patterns—such as dispersal mechanisms, environmental tolerance, climate, land use, geological features, vegetation, topography, and water chemistry—we seek to develop effective conservation strategies for fisheries resources. Given the significance of freshwater ecosystems, especially in cold-water regions like the Himalayas, this study will shed light on the ecological and economic importance of these habitats. Additionally, by documenting the diversity and distribution of fish species in the Kashmir Valley, this chapter aims to contribute to the broader understanding of freshwater biodiversity, inform conservation policies, and support sustainable management practices for India's rich fisheries resources.

Introduction Schizothoracinae, commonly known as snow trouts, are a specialized group of fish thriving in the fast-flowing, snow-fed streams and lakes of regions such as Afghanistan, Pakistan, the Himalayas in India and Nepal, China, and parts of the former USSR. Adapted to these challenging environments, Schizothoracinae have not been extensively studied due to the difficult terrain they inhabit. In India, they are primarily found along the Himalayan range, with an exception in the Periyar, Kerela (river and lake). The Indian Schizothoracinae are classified into seven genera, forming a significant part of Exclusively Distributed by NIPA GENX Electronic Resources and Solution Pvt. Ltd. New Delhi the Himalayan fishery. Resembling Salmonidae, they are commonly referred to as "Indian Trout." Early mentions of Schizothorax species by Day (1877, 1889) were brief. Subsequent taxonomic studies by researchers such as Hora (1921, 1934, 1937, 1953), Misra (1949), and Mukerji (1936) have provided a more comprehensive understanding of their taxonomy. The Schizothoracinae, part of the Cyprinidae family, represent a diverse group uniquely adapted to high-altitude environments and have been categorized into three groups based on their morphological characteristics: "primitive group," "specialized group," and "highly specialized group" (Cao et al., 1981). The primitive group includes Schizothorax and Aspiorhynchus, which share more traits with the outgroup Barbodes hexagonolepis. They are distinguished by the presence of uroneuralia, three or four rows of pharyngeal teeth, minimal scale degeneration, and a lack of pronounced sexual dimorphism. The specialized group includes Ptychobarbus, Gymnodiptychus, and Diptychus, and is marked by the absence of uroneuralia, one or two rows of pharyngeal teeth, and moderate scale degeneration. The highly specialized group, which comprises Gymnocypris, Oxygymnocypris, Schizophygopsis, Chuanchia, and Platypharodon, is characterized by the complete absence of barbels and scales and a well-developed canalis preoperculomandibularis (Qi et al., 2012, Yonezawa et al., 2014). The genus Schizothorax comprises 63 species in total. Among these, 34 species are mainly found in Central Asia, while 28 species inhabit the Indo-Himalayan region. The species of Schizothorax in the Himalayan region include S. curvifrons, S. nasus, S. richardsonii, O. sinuatus, S. planifrons, S. esocinus, Schizothoraichthys progastus, S. longipinnis, S. kumanonensis, O. molesworthii, S. hugelli, S. labiatus, and S. micropogon (Menon, 1999; Mishra, 2003; Zhang et al., 2018; Ma et al., 2020).

Introduction to the Salmonid Family (Trout’s and Salmon) The Salmonidae constitute the only extant family of ray-finned fish in the order Salmoniformes, with 11 genera and more than 200 species collectively referred to as "salmonids" or "salmonioids". This family includes all coldwater mid-level predatory fish found in subarctic and cool temperate waters in the Northern Hemisphere, such as char, graylings, freshwater whitefish, taimens, lenoks, and salmon (both Atlantic and Pacific species). In addition to being the Exclusively Distributed by NIPA GENX Electronic Resources and Solution Pvt. Ltd. New Delhi eponym of its genus, the Atlantic salmon (Salmo salar), has also been given the names of its family and order as well. Among teleost fish, salmonids have a relatively primitive appearance, with pelvic fins in the rear and an adipose fin at the rear. There is a single row of sharp teeth in their mouth, along with rounded scales and forked tail fins (Mc Dowell, 1998). Salmonids vary greatly in size, and the smallest reach only 13 cm (5.1 in) when adults, while the largest reaches 2 m (6 ft 7 in) (Pauly et al., 2008). Salmonids are migratory fish that spawn in the shallow gravel beds of freshwater headstreams, develop into juveniles in rivers, creeks, small lakes, and wetlands, and then migrate downstream to spend the majority of their adult lives in larger bodies of water upon reaching maturity. Often euryhaline, salmonid species migrate to the sea or brackish estuaries as soon as they reach adulthood. Just for breeding purposes, they migrate back to the upper streams. Some freshwater salmonids that migrate only between lakes and rivers are referred to as potamodromous, whereas the life cycle of these sea-run salmonids is known as anadromous. In the middle food chain, salmonids are carnivorous predators that eat smaller fish, crustaceans, aquatic insects and larvae, tadpoles, and occasionally fish eggs (even those belonging to their own species), which are then eaten by larger predators. Salmonids are regarded as keystone organisms that contribute biomass to freshwater and terrestrial ecosystems as a result of their mass migration from oceanic to inland waterbodies. Three lineages of salmonids are currently recognized, each classified as a subfamily: Coregoninae (freshwater whitefish), Thymallinae (graylings), and Salmoninae (trout, salmon, char, taimens, and lenoks). Each of the three lineages is generally accepted to belong to a monophyletic group based on derived traits (McPhail and Strouder, 1997). Salmons and trouts are well-known for their economic importance as both sport fish and commercial products. Trout and salmon stocks are stocked worldwide each year for sport and commerce. Millions of salmon and trout are hatched, raised, and stocked every year as part of government investment programs. To meet market and restaurant demands for trout, a large private industry has developed—especially in Denmark, Japan, and the U.S. Scientists are confronted with the challenge of perpetuating and increasing the abundance of salmon and trout because of the increasing human population and industrial and agricultural demands on rivers. Among heavily populated regions, the demand for trout outstrips the supply. As a result, state and federal agencies in the United States have initiated massive programs to raise and stock trout in heavily fished waters. The artificial abundance of trout, however, is not a good substitute for the natural abundance of the fish.

Introduction Any species that has been accidentally or purposely brought outside of its current range by humans is considered an introduced (or exotic) species (Kottelat and Whitten, 1996). According to the International Union for Conservation of Nature and Natural Resources (IUCN), an alien species is considered invasive when it establishes itself in natural or semi-natural ecosystems or habitat, causes change, and endangers the biological diversity of the host species. These invasives encompass all classes of living things and are widely dispersed throughout the world's ecosystems (Raghubanshi et al., 2005). Numerous reasons led to the introduction of exotic fish species in various parts of the world: (a) increasing the potential for local fisheries and diversifying species in aquatic systems; (b) promoting sport fishing; (c) maintaining aquariums; and (d) managing undesired organisms like mosquitoes, etc. (Biju Kumar, 2000). Furthermore, floods and a variety of other factors may allow exotic fish imported into one nation to spread to its neighbors. According to Welcome (1988), 168 fish species from 37 families have been introduced worldwide outside of their native area. At least 67 of these species have established themselves in various bodies of water, with 27 of them turning out to be serious pests. Approximately 20 percent of freshwater fish species worldwide are either extinct or in danger of going extinct (Moyle and Leidy, 1992). Over time, the introduction of new species might prove to be a very harmful issue. Nyman (1991) stated that the introduction of alien species may cause the aquatic environment to undergo permanent alterations and perhaps cause the extinction of some species. As a result, the careless introduction and movement of aquatic species, especially fish, caused much worry across the world since it led to several issues, including the extinction of native species. Fish native to the area compete with exotics for food and habitat. They might kill local fish, bring in new illnesses and parasites, create hybrids, pollute the genetic pool, and lower the standard of the aquatic ecosystems. The loss of priceless biodiversity will result from all of these (Nyman, 1991). Potential hazards include those that might affect not just biodiversity quality or quantity but also the socioeconomic facets of the human society that depend on aquatic environments for survival (Philipp et al., 1995). Introductions are a legitimate way to increase aquaculture and fisheries productivity and economic advantage. Indeed, the primary driving force behind the migration of fish and shellfish across continents and even geographic regions has been aquaculture. To address the growing need for food and nutritional security, exotic species have been used to diversify fisheries and aquaculture. Species introductions and transfers from one hydrographic

Introduction The Kashmir Valley, situated in the western Himalayas between latitudes 33°01'N and 35°00'N and longitudes 73°48'E and 75°30'E, spans an area of 4,920 square kilometers and sits at an elevation of 1,585 meters. This region is rich in water resources, featuring numerous lakes, rivers, and wetlands. The ecosystem benefits from a continuous supply of water from perennial glaciers, mountain streams, and a multitude of springs. It is estimated that more than Exclusively Distributed by NIPA GENX Electronic Resources and Solution Pvt. Ltd. New Delhi 6% of Kashmir's land surface is covered by various types of water bodies, enhancing the valley's natural beauty (Zutshi and Gopal, 2000). Whether from glaciers, springs, rivers, or lakes, the water in Kashmir contributes significantly to its picturesque landscape. The Kashmir Valley hosts a variety of 23 fish species, both native and introduced (Bhat et al., 2020). Cypriniformes, the largest group of freshwater fish, are divided into two main superfamilies: Cyprinoidea (carp like fishes) and Cobitoidea (loach fishes). This classification covers a wide variety of aquatic species, highlighting the extensive biodiversity within the Cypriniformes order (Nelson et al, 2016). The initial documentation of cold-water fish in India was provided by Hamilton in 1822. The Cobitidae family, known as true loaches, includes species such as Botia birdi found in the Kashmir Valley. The family Balitoridae, specifically the subfamily Nemacheilinae, in this region include two scaleless fish species earlier named as Cobitis vittata and C. marmorata by Heckel (1838) but Kullander et al. (1999) renamed them as Triplophysa marmorata and T. kashmirensis and Paraschistura punjabensis. Loaches are a fascinating subject for aquatic enthusiasts and researchers alike. Found predominantly in Eurasian waters, these bottom-dwelling fish are recognized for their distinctive elongated bodies, small scales, and barbels around the mouth which aid in their sensory and feeding functions. Loaches are renowned for their adaptability, thriving in a variety of habitats ranging from fast-flowing rivers to stagnant ponds. With over 200 species classified across several genera, loaches exhibit a remarkable range of behaviours and ecological roles, from the well-known clown loach (Chromobotia macracanthus), popular in the aquarium trade, to the stone loach (Barbatula barbatula), a species integral to the ecosystems of European rivers and streams (Nelson, 2006; Kottelat, 2012). Loaches play significant roles in their natural habitats, contributing to the benthic community dynamics and nutrient cycling. Their sensitivity to environmental changes makes them valuable bioindicators for assessing the health of freshwater ecosystems (Kottelat & Freyhof, 2007).

Introduction Climate change refers to alterations in the earth's global or regional climates over time, encompassing shifts in atmospheric variability or average conditions over periods ranging from decades to millions of years. The United Nations Framework Convention on Climate Change (UNFCCC) differentiates between "climate change" for human-induced alterations and "climate variability" for other changes. Over the past century, ending in 2005, the average global air temperature near the earth's surface has risen at an estimated rate of 0.74 ± 0.18°C (1.33 ± 0.32°F) (IPCC, 2007). In contemporary discussions, especially within environmental policy, "climate change" often refers to recent climate alterations. Both natural processes and human activities influence the earth's temperature and subsequent climate change. Significant increases in global anthropogenic greenhouse gas (GHG) emissions over the years have been major contributors to global warming. The sun, the earth's primary energy source, has a nearly constant output, but minor variations over extended periods can lead to climate change. Natural processes such as orbital changes (orbital forcing), volcanic eruptions, and greenhouse gas concentrations in the atmosphere also affect the earth's climate. Changes in atmospheric concentrations of greenhouse gases and aerosols, land cover, and solar radiation modify the climate system's energy balance, leading to either warming or cooling. Volcanic eruptions release several gases, notably sulfur dioxide (SO2), which forms sulfate aerosols (SO4) in the atmosphere. Although linking specific weather events to global warming is challenging, increased global temperatures can result in broader changes like glacial retreat, Arctic shrinkage, and rising sea levels worldwide. Variations in precipitation patterns could lead to floods and droughts. Other impacts may include shifts in agricultural yields, the creation of new trade routes, reduced summer stream flows, species extinctions, and the spread of disease vectors. Most global climate change models predict a decline in snowpack on many western mountain ranges, adversely affecting fish populations, hydropower, water recreation, and water availability for agricultural, industrial, and residential use. Partial loss of polar ice sheets could lead to significant sea level rise, altering coastlines and inundating low-lying areas, with the most significant effects on river deltas and low-lying islands. These changes are projected over millennial timescales, but rapid sea level rise within centuries cannot be ruled out. Current climate change models predict a rise in sea surface temperatures between 2 °C and 5 °C by 2100 (IPCC Third Assessment Report, 2001; Done et al., 2003). According to the climate profile document of Jammu and Kashmir, the region has seen an increase in average temperature, with the Kashmir valley rising by 1.45°C and the Jammu region

Overview of fishing methods in Kashmir The water resources of the region of Jammu and Kashmir are abundant, ranging from large lakes in valleys and high altitudes to ponds, pools, streams, marshes, springs, and rivers. Its approximate size is 222236 square kilometers, extending from latitudes 32° 17′ N to latitudes 36° 58′ N and from longitudes 73° 26′ E to longitudes 80° 30′ E. Its whole water spread area is around 32765.3 hectares, or 2% of its overall area (Anon., 2013). Because of their unique natural characteristics, the vast water resources found in lakes, marshes, streams, and rivers are ideal locations for cold water fishing and, as such, have played a significant role in the growth of this sector. These water bodies support diverse populations of both indigenous and exotic fish species, suitable for cultivation as well as those that thrive without human intervention (Mahanta et al., 2009). The Kashmir Valley's water bodies are home to several native and alien fish species (Shah et al., 2020). The Central Asian fauna, which is dominated by the Schizothorax group, makes up the majority of Kashmir's ichthyofauna (Sunder et al., 1978). Kashmir is endowed with several lakes, including Manasbal, Dal, Wular, and others, each having a unique hydrological environment (Balkhi et al., 1987). Since every lake in Kashmir Valley is located on the Jhelum River's flood plain, the lakes' origins are either tectonic or fluviatile. The Wular Lake, which is situated in District Bandipora and is referred to as the "fish bowl of Kashmir" since it supplies 60% of the fish produced in the Kashmir valley, is said to be the biggest freshwater lake in India (Malik et al., 2018). It spans over 200 square kilometers. The Wular Lake is bordered by several villages all along its shores, including two sizable cities, Bandipur and Sopore, Gurumayun and Choudhury (2009). Rich biodiversity is supported by Wular Lake and the marshes that surround it. It is a significant fishing resource in the valley, providing food for a sizable population that lives on its edges. The lake is the valley's greatest fishing resource and an essential home for migrating water species, including geese, ducks, shorebirds, and cranes (Syed et al., 2020). An understanding of fishing gear is essential for managing fisheries, Target species, fishing location, climate, and water velocity are only a few of the variables that affect how different fishing methods and equipment are used and regulated. Due to the unique characteristics of these habitats, classic fishing techniques that are useless in plains water bodies with slower current may be used in locations with swiftly flowing water, especially in mountainous regions. Understanding the traditional catching practices and gear of a region is

Introduction The northernmost territory of the Republic of India, Jammu and Kashmir (latitude 32.28–37.06° and longitude 72.53–80.32°), is situated in the North Temperate Zone, characterized by its temperate-like conditions due to altitudinal variations (220 to 8611 m above mean sea level). The area is rich in biodiversity, with its mountainous terrain creating a beautiful aquatic landscape that is a key feature of its idyllic scenery. The aquatic resources over the valley primarily consist of high-altitude lakes, with wetlands and rivers following. These resources are more prevalent at higher altitudes, with decreasing occurrence at mid and lower altitudes. The freshwater bodies in the valley support a diverse array of macrophytes, phytoplankton, and zooplankton (Shah et al., 2020). Aquatic weeds, or hydrophytes, are found in water bodies worldwide, including those in India. Aquatic weeds are generally described as unwanted plants in the aquatic ecosystem. They occupy various ecological niches within these water bodies and play crucial roles in their ecosystems. India is home to numerous native vascular aquatic plants, as well as various non-native species. These aquatic plants include monocots, dicots, periphyton, and angiosperms. They serve as primary producers in the water bodies, contributing to oxygen production and offering nutritional and medicinal benefits. Despite their importance to the aquatic ecosystem, excessive growth of aquatic weeds can pose significant risks to aquatic organisms, particularly fish diversity in the affected areas. The aquatic macrophytes of the Kashmir valley have been documented extensively by various authors over time, continuously updating the knowledge of the regional aquatic flora. Based on the recent finding of Ganie et al. (2020), the valley currently hosts 191 species of macrophytes, both aquatic and semiaquatic. These plants belong to 27 families and 80 genera, distributed across 22 dicotyledons, 12 monocotyledons, and 3 pteridophytes. Of these, 92 species are fully aquatic, including free-floating and submerged types, while 99 species are semiaquatic and emergent. In terms of diversity, the highest number of macrophyte species (160) has been reported from Kashmir, followed by 94 species in Jammu and 44 species in Ladakh. The distribution of aquatic weeds in the Kashmir valley includes prominent water bodies such as Dal Lake, Wular Lake, and Manasbal Lake. These lakes support a variety of macrophytes, contributing to the rich biodiversity of the valley. Dal Lake, for instance, is known for its extensive growth of Hydrilla verticillata and Potamogeton natans, while Wular Lake hosts species like Nymphaea alba and Trapa natans. The variety of aquatic plants in these water bodies is crucial for maintaining the ecological balance and health of the aquatic ecosystems of the valley. The diverse array of aquatic weeds in the waterbodies of the valley acts as a "double-edged sword" for the ecosystem. On one hand, these plants provide oxygen, maintain the nutrient cycle, and serve as food for some phytophagous fishes. On the other hand, their overabundance can create mosquito breeding grounds, absorb vital nutrients from the water, release toxic chemicals, and cause dead zones at night by consuming oxygen for respiration. Therefore, it is crucial to control and manage the population of aquatic weeds to ensure the wellbeing and sustainability of the aquatic ecosystem.

Introduction An organism can be highly destructive in one habitat while coexisting peacefully in another. It is exceedingly challenging to forecast the impact of a new species on the local flora and fauna when it is brought into an ecosystem where it has never before lived naturally. In competition for resources and space, the imported species can surpass the native fauna. A delicate web of interdependence that gradually shaped over thousands of years is harmed when introduced species compete more successfully for resources because they have no predators in the area. In certain cases, they even kill and eat native populations (Raman et al., 2013). Fish species classified as non-native are those that have been intentionally introduced outside of their natural range (for example, to support aquaculture, improve a reservoir or recreational fishery, through the ornamental fish trade, or to control mosquitoes), accidentally introduced (for example, through bait releases, aquaculture escapes, or ballast water transport (Gupta and Everard, 2019), or introduced in the name of wellmeaning but misguided religious practices (Everard et al., 2019). Due to their higher birth rate, the tendency to feed on local fish species, increased growth rate, larger size, longer life spans, or competition for comparable food supplies and habitat, these species may negatively impact native fish species (Ricciardi and Rsmussen, 1998). The International Union for Conservation of Nature and Natural Resources (IUCN) classifies alien invasive species as those that spread quickly through natural or semi-natural ecosystems or habitats, act as change agents, and endanger the biological diversity of the host species. These invasive are widely dispersed across the world's ecosystems, including every class of living thing (Raghubanshi et al., 2005). Fish native to the area compete with exotics for food and habitat. The quality of the aquatic ecosystems may deteriorate, new illnesses and parasites may be introduced, hybrids may be produced, native fish may be killed, and genetic "pollution" may occur. All of these will eventually cause the priceless biodiversity to disappear (Nyman, 1991). The socioeconomic facets of the human population that depend on aquatic environments for survival are also at danger, in addition to possible consequences on the quantity or quality of biodiversity (Philipp et al., 1995). The most varied group of vertebrates is fish, and freshwater fish in particular are thought to be among the most critically threatened animal species due to the introduction of alien (or non-native) species, which are species that do not typically occur in an aquatic environment (CONABIO, 2008). According to Contreras-Balderas (1999), these species hurt local populations when they are introduced and harm ecosystems by causing the water body to deteriorate. Maclvor brought the first group of exotic fish in 1874, namely crucian carp

Overview of Recreational Fisheries in India with Special Emphasis on Kashmir Valley Sport fishing, often referred to as Recreational fishing is fishing for fun or competition. It differs from commercial or subsistence fishing which targets for profit or fishing for survival respectively (Mandal et al., 2016). As per FAO (2012), recreational fishing is fishing of aquatic animals (mainly fish) that do not constitute the individual’s primary resource to meet basic nutritional needs and are not generally sold or otherwise traded on export, domestic or black markets. It is one of the most adventurous things in the world. In the simplest form, sport fishing involves using rods, lines, hooks and bait or lures to attract and catch the fish (Mandal et al., 2016). The fighting attributes of the target species leads to the sport of the fishermen in Sport fishing. Even though the sport fishing seems to be limited in the freshwater ecosystems it is extended to the marine waters also. Sport fishing involves catching of fishes which require skills as well as knowledge regarding the behaviour and food preferences of the target species. Sport or game fish are the targeted species that are caught by rods and lines and not released back into the water by the hobbyist or fishermen in disgust. However, releasing the catch to the environment should be a prerequisite for sport fishing considering the ecological and conservation point of view. In sport fishing, the target fish is played by the hobbyist until the fish is landed or lost (IGFA, 2016). According to Mandal et al. (2016), sport fish can be categorised into 2 group namely Small and Big. The fish which as less than 50 kg are grouped as the small ones like mahsser, trout etc. whereas fish weighing more than 50 kg are grouped as big ones like Goonch catfish. Fishing is an old age practice and fishing by hooks and line is the primitive form. Fishing purely for fun and releasing caught fish is a much more modern development. Although it is not possible to clearly state when fishing was first said to be recreational, the book titled ‘The Complete Angler’ by Izzak Walton in 1963 described recreational fishing for the first time. In India, King Somesvara’s (1127 AD) has mentioned about recreational fisheries (Matsyavinoda) in his treatise “Manasollosa” (Hora, 1951). With the record and description of mahseer from Ganges in the early 19th century, soon it became popular as an angling species through the efforts of the Oriental Sporting Magazine (Nautiyal, 2014). In the meantime, many different authors have pointed out about angling in India and highlighted about the sporting fishes. British anglers have introduced first-time brown trout (1860s) and rainbow trout (1909) in streams and rivers of the Himalayas and Western Ghats (Sehgal, 1999a, b). Although recreational angling struggled to maintain its

Introduction Fish raised in cold water fisheries are species that flourish in temperatures usually below 20°C. To increase fish production and provide jobs for the local population, cold water fisheries have been established throughout India. One important region in India where cold-water fisheries have been effectively Exclusively Distributed by NIPA GENX Electronic Resources and Solution Pvt. Ltd. New Delhi established is Himachal Pradesh. There are plenty of cold-water rivers and streams in this area that are perfect for fish farming. To encourage cold water fisheries, the state government has launched several programmes, including financing for the construction of fish farms and the purchase of supplies and equipment. The most often farmed fish species in Himachal Pradesh's cold water fisheries are brown trout, rainbow trout, and mahseer (Bhat et al., 2023). India is well known for its cold-water fish, which are highly prized for their flavour. In addition to Himachal Pradesh, other states that have embraced cold-water fisheries include Jammu and Kashmir, Uttarakhand, Sikkim, and Arunachal Pradesh. However, obstacles to their growth include restricted market access, a lack of technological know-how, and inadequate infrastructure. The many cold-water fisheries in northern and northeastern India demonstrate the region's enormous potential despite these obstacles (Pandey et al., 2021). These fisheries support a variety of fish species that have evolved to live in colder waters. With an approximate length of 2,500 km, the Himalayas stretch from Nanga Parbat (8,126 m) in the west to Namcha Barwa (7,756 m) in the east, encompassing an area of 594,400 km². Its western boundary is the high plateau of Tibet; its northern boundary is the Karakoram Mountains; the range's southern and northern limits are separated by 200–400 km. The Siwaliks, the lesser and Greater Himalayas, and the Trans-Himalaya run parallel to each other from south to north and are identified by their physiographic features and geological histories. With a combined catchment area of around 160,000 km², the Indus and Brahmaputra are the longest of the nineteen major rivers that meander through the Himalayas. When these rivers emerge from the mountains; many of them pass through wide valleys. According to Shinn et al. (2015), the distribution of fish species in Himalayan streams is influenced by variables such as flow velocity, substratum type, water temperature, and the availability of food. The intensification of aquaculture systems has resulted in the appearance of new pathogens and a greater dependence on antibiotics and other supplements, which threaten the health of fish, humans, and the environment (Watts et al., 2017). Aquaculture faces a great deal of difficulty due to diseases, which result in large production losses that surpass six billion USD annually (Bhat et al., 2023). According to estimates, 10–50% of aquaculture production expenses are related to disease management (Sahoo et al., 2017). This book chapter provides a brief overview of some prevalent parasite, viral, and bacterial diseases that have been linked to temperate and cold-water aquaculture, along with information on potential remedies and preventative measures. Commonly disease found in fish are presented in (Table 1, 2 and 3).

Introduction The Union Territory of Jammu and Kashmir is blessed with various water resources dispersed over an area of 0.40 lakh hectares due to its distinct terrain and three distinct climatic conditions. There is enormous potential for coldwater, warm-water, reservoir, and sport fishing due to the existence of coldwater streams, rivers, lakes, high-altitude lakes, springs, and sars, among other features (DoF-J&K, 2022). Three-quarters of the cold-water fisheries Exclusively Distributed by NIPA GENX Electronic Resources and Solution Pvt. Ltd. New Delhi are derived from J&K. Still, the UT makes for no more than 1% of the nation's aquaculture output. According to DoF (2020), J&K had 0.21 lakh tonnes of inland fish output in 2019–20. In Kashmir, just 15% of the 70% of people employed in agriculture are fishermen (Qureshi, 2013). Limited infrastructure and connectivity in the highlands are substantial obstacles to the sector's expansion. However, the fishing industry still plays a significant role in the existence of the inhabitants of Kashmir, providing subsistence fishing as a means of nutrition and operating as an affordable and dependable supply of protein in the landlocked area (CMFRI, 2015). Approximately 70% of the entire output comes through the lakes of Dal and Wular, which account for the bulk of the harvest (Qureshi, 2013). The characteristics of cold-water assets, including creeks and upland streams, contain exceptional transparency, high dissolved oxygen (DO), bedrockboulder- sand substrata, and high flow rates. These natural settings consist of gushing waters, cascades, torrents, and deep pools. The slopes of the Himalayas are home to 272 fish species (Sarma et al., 2018). Elevated heights result in reduced human influence and nutrient-poor water bodies due to catchment features. The glacier lakes are ultra-oligotrophic at relatively high elevations (Gopal, 2012). Fish in these waters develop slowly and only to tiny sizes because of the limited biological production. Large-scale commercial fisheries are therefore not supported by these cold-water resources. Likewise in other areas, human footprints have had a noticeable effect on Kashmir's flora, wildlife, and water sources. Challenges include things like contamination, eutrophication, and the inundation of alien species. Massive sedimentation has been made worse by tourism and growing urbanisation, which has reduced fisheries. Particularly impacted are native fish species, notably those in the Schizothorax genera (Qureshi et al., 2013). The future value of resourcefulness is diminished by this deterioration, which affects regional populations' ability to make a living and provide adequate nutrition. At this stage, the lakes in Kashmir are frequently contaminated, weed-filled, vulnerable to harmful algal blooms, bordered by marshlands (Tahseen et al., 2018). The concern must be addressed, with special attention to the larger context of Kashmir. Under several topics, this section examines the primary human interactions and how they affect the cold-water fishing industry and management.

Introduction The global population is on track to surpass 9 billion by 2050, leading to a staggering 70% increase in the worldwide demand for food, feed, and fibre. This population growth is closely linked to significant shifts in lifestyle and consumption patterns, primarily driven by the accelerating pace of urbanization. As a consequence, it is anticipated that there will be a decline in the consumption of grains and pulses, coupled with a significant increase in the consumption of vegetables, fruits, meat, dairy, and fish. Aquaculture, a time-tested industry, stands out as a crucial source of high-quality protein for humanity (Nash, 2010; Gui et al., 2018). As our global population continues to expand, the challenges of resource scarcity and environmental degradation are becoming increasingly evident. Land resources alone are no longer sufficient to support the evolving needs of our society. Consequently, our oceans are emerging as a new frontier for human sustenance and development, with fish taking on a pivotal role as a source of high-quality protein and a fundamental dietary staple (Baiden and Bissiri, 2007). Over the past few decades, aquaculture has risen to become the fastest-growing sector within agriculture. Since 2013, its production has even outstripped that of wild fisheries (FAO, 2020). This formidable challenge presents particularly alarming situations in developing countries where poverty and hunger persist (World Bank, 2014). In such a context, fisheries and aquaculture are anticipated to play a vital role in ensuring nutritional security (Subasinghe, 2014). According to the FAO, food production will need to rise by 70% by 2050 to meet the rising demand brought on by population growth and dietary changes (FAO, 2009). By effectively using the limited water resources, the fisheries industry may serve to address this issue and contribute significantly to nutrition and food security. A significant source of nutrition, food, income, and livelihood for millions of people worldwide continues to be the fishing and aquaculture industries (FAO, 2016). Additionally, fish contribute to global food security by providing up to 17% of the protein consumed by the world's population (Bennet et al., 2018), and fishing is one of the most widely practised livelihoods worldwide (FAO, 2014). Although fish are the most diversified group of vertebrates, they are the second most threatened species after amphibians (Collen et al., 2014). Freshwater ecosystems have been among the most endangered habitats worldwide in recent decades. Freshwater researchers have become more concerned about the devastation of riverine environments, changes in aquatic ecosystems, rapid decrease in water quality, and considerable decline in the variety and abundance of stream fishes. The presence, distribution, abundance, and diversity of fishes in the aquatic ecosystem are influenced and shaped by