eChapters

Technological change has been the major driving force for increasing agricultural productivity and promoting agriculture development across the world. In the past, the choice of technologies and their adoption was to increase production, productivity and farm incomes. Over many decades, policies for agriculture, trade, research and development, education, training and advice have been strong influences on the choice of technology, the level of agricultural production and farm practices. Agricultural production today faces several challenges: an increasing world population has to be fed, but at the same time the environment and animal welfare need to be protected. Globalisation has led to increasing international competition, while the agricultural sector is also under heavy economic pressure as a result of regulation. These conditions can perhaps only be met by innovation, be it on the technological or on the systems-level (OECD, 2001). Agriculture is becoming more integrated in the agro-food chain and the global market, while environmental, food safety and quality, and animal welfare regulations are also increasingly impacting on the sector. It is faced with new challenges to meet growing demands for food, to be internationally competitive and to produce agricultural products of high quality. At the same time, it must meet sustainability goals in the context of on-going agricultural policy reform, further trade liberalization and the implementation of multilateral environmental agreements as agreed to by the government.

6.1 Introduction

India experienced an impressive growth and productivity gains in agriculture since Independence reflecting our farmers’ resilience against multiple odds and challenges. Despite a structural transformation post-Green Revolution, characterized by a consumer centric and food security policy objective, the regular distress and crises in the recent past pose a severe threat to income and livelihood security of farmers. The income realised from agriculture compared to nonagriculture, has been too low with a wide variation across regions. The average income of an agricultural household during 2012-13 has been estimated as low as at `6426 per month, marginally higher than the average consumption expenditure (`6223). Further, around 23 per cent of the farmers still live below the poverty line (DFI Committee, 2017a). Estimates from the Central Statistics Office’s (CSO) indicated that the annual growth in gross value added from agriculture has reduced drastically from as high as 6.9% (October-December, 2016) to a mere 2.3% (April-June, 2017) at 2011-12 prices in the recent past ten quarters. Shockingly, the growth was lower in nominal terms in comparison to real prices during the April-June, 2017 quarter indicating the creeping deflation in farm sector.

Agriculture has been very successful in addressing the food and fiber needs of today’s world population. However, there are increasing concerns about the economic, environmental and social costs of this success. Integrated agricultural systems may provide a means to address these concerns while increasing sustainability. Integrated agricultural systems have multiple enterprises that interact in space and time, resulting in a synergistic resource transfer among enterprises. In an integrated agricultural system, management decisions, such as type and amount of commodities to produce, are predetermined. Full integration of agricultural systems at the producer or community scale may help in slowing or reversing some of the detrimental environmental and economic problems associated with specialized industrial agriculture. Modern agriculture requires intensive inputs.

Earthworms have been on the earth for over 20 million years. In this time they have faithfully done their part to keep the cycle of life continuously moving. Their purpose is simple but very important. They are nature’s way of recycling organic nutrients from dead tissues back to living organisms. Many have recognized the value of these worms. Ancient civilizations, including Greece and Egypt valued the role of earthworms played in soil. The Egyptian Pharaoh, Cleopatra said, “Earthworms are sacred”

4.1 Earthworms

Earthworms belong to Phylum Annelida of animal Kingdom. They are long and cylindrical shape, length of earthworms vary from a few mm to nearly 3mtr as noted in case of Megas colex species found in Australia. The body of earthworms has a large number of grooves. Due to these grooves the body of the earthworm is divided into number of compartments called segments. In mature earthworms, few anterior segments appear swollen due to glandular thickening. This part is called as clitellum. The segments are not clearly seen in this part. There are 2500 to 3,000 species of earthworms in the world which are adapted to range of environment. More than 350 species have been identified in India. The species of earthworms are differentiated mostly on the basis of external features such as length of earthworms, number of segments, position of clitellum and external aperture present on the body. Earthworms were referred by Aristotle as “the intestines of earth and the restoring agents of soil fertility”

The earlier products of bio-fertilizers were carrier (solid) based where lignite is usually added as a carrier material. Lignite is hazardous to the production workers. Also, the shelf life of carrier based bio-fertilizers is only 6 months and is difficult to transport. Liquid Biofertilizers (LBFs) on the other hand have a shelf life of minimum one year, with no health hazards to production workers and are easy to transport. Additionally, LBF can be used in drip irrigation and as a component of organic farming. The liquid Bio fertilizers are suspensions having agriculturally useful microorganisms, which fix atmospheric nitrogen and solubilize insoluble phosphates and make it available for the plants. The use of this biofertilizer is environment friendly and gives uniform results for most of the agricultural crops and directly reduces the use of chemical fertilizer by 15 to 40%. The shelf life of the liquid bio fertilizer is higher (in the range of one to two years) compared to that of solid matrix base biofertilizer.

3.1 Definition

Liquid biofertilizers are liquid formulation containing the dormant form of desired microorganisms and their nutrients along with the substances that encourage formation of resting spores or cysts for longer shelf life and tolerance to adverse conditions. The dormant form on reaching the soil, germinate to produce fresh batch of active cells. These cells grow and multiply by utilizing the carbon source in the soil or from root exudates.

“A preparation comprising requirements to preserve organisms and deliver them to the target regions to improve their biological activity” or “A consortium of micro-organisms provided with suitable medium to keep up their viability for certain period which aids in enhancing the biological activity of the target site”.

2.1 Introduction

Microbes are the oldest form of the life on earth. These organisms date more than 3 billion years to a time when they were covered with oceans. They are so tiny in size that million microbes can fit into the eye of a needle. Without microbes, we can’t live. Thus, understanding microbes is vital to understanding past and future. Microbes play vary roles in the earth’s environment recycling dead plant and animal matter through the soil, removing CO₂ from the atmosphere by photosynthesis in the oceans and nitrogen from the atmosphere to form nitrogenous fertilizers plants. Microbes play an important role in nutrient recycling, management, organic matter, decomposition and increasing the crop productivity and quality against diseases. Over the past century, many of the basic scientific principles of plant nutrition and soil fertility have been explained. In developed countries, inorganic chemical fertilizers have been widely accepted as a major source of improving and maintaining soil fertility. Plants need sufficient nutrients in proper balance for normal growth and development. Seventeen plant nutrients are essential for proper crop development. Each is equally important to the plant, yet each is required in vastly different amounts. Our understanding of nutritional needs of crop plants begin from the famous five year willow tree experiment conducted by J.B. van Helmont (1579–1644).

Sustainable development has caught the imagination and action across the world. Sustainable agriculture is necessary to attain the goal of sustainable development. The word “sustain,” is derived from the Latin sustinere (sus-, from below and tenere, to hold), to keep in existence or maintain, implies long-term support or permanence. As it pertains to agriculture, sustainable describes “Farming systems that are capable of maintaining productivity and usefulness to society indefinitely. Such systems must be resource-conserving, socially supportive, commercially competitive, and environmentally sound”. “Sustainable agriculture is the successful management of resources for agriculture to satisfy changing human needs while maintaining or enhancing the quality of environment and conserving natural resources” (FAO). All definitions of sustainable agriculture lay great emphasis on maintaining an agriculture growth rate, which can meet the demand for food of all living things without draining the basic resources. Over time, the International Alliance for sustainable agriculture and an increasing number of researchers, farmers, policy-makers and organizations worldwide have developed a definition that unifies many diverse elements into a widely adopted, comprehensive, working definition

Shrimp culture is slowly emerging as one of the major and fastest growing food production sector in the world. High demand in the international market encouraged many developing countries to grow shrimp in their coastal areas. Many countries including India earn sizable foreign exchanges by exporting both shrimp and frozen shrimp. International institutions like the World Bank, Food and Agriculture Organisation (FAO) etc. have also encouraged production of shrimp that fetch huge returns on investment within a short period of time. Indigent coastal people in India have been farming fish for hundreds of years. The warm climate, accessibility to coast, saline water and relatively low wage rate provides a comparative advantage for shrimp cultivation. Commercial shrimp farming developed in India on account of the government’s policy to promote shrimp culture in view of its potential to utilise the vast saline tracts along the coastline and to provide employment opportunities to coastal rural population. After the liberalization, development of shrimp culture gained greater momentum in the country. Individual entrepreneurs were also encouraged to take up shrimp farming with both financial and technical support from the government.

‘Shrimp’ which is an aquatic organism inhabiting the sea, estuaries and backwaters remained the backbone of Indian marine products exports. Shrimp is a protein-rich food with universal taste. Shrimp farming is a short duration activity and therefore, provides quick return on investment. It also provides gainful employment opportunities to the rural poor in the remote coastal areas. The value of shrimp exported in 2011-12 from India was estimated at about Rs. 8175.26 crores (US$ 1741.20 million). According to an estimate made by MPEDA, one hectare of shrimp culture operation can provide direct employment to atleast two persons and can also generate indirect employment to the extent of 1100 man-days.

Shrimp culture has a long tradition in India that began with the tidal stocking of shrimp in paddy fields and lagoons and holding them until harvest. More intensive forms of shrimp farming developed rapidly during the 1990’s. As was the case in many other nations in Asia, the development of shrimp farming in India took place without planning and regulation. This resulted in a variety of environmental problems and social conflicts. Although India has benefited from rising foreign exchange earnings, the conflict of coastal communities with shrimp farming has prompted a heated debate over the relevance of aquaculture in coastal ecosystem. Questions have been raised on its sustainability in the long run and some people also accused that this culture has disturbed the social harmony and has raised the inequality level in the rural areas.

The impetus for the development of aquaculture extends beyond food production. Aquaculture can help to diversify rural employment opportunities, reduce trade deficits, reduce pressure on living marine resources and rebuild depleted wild stocks (FAO, 2000b). The rapid development of coastal aquaculture, however, is now an area of critical international concern owing to the immense role it plays in transforming coastal landscapes and livelihoods. With the advent of new technology and rising global demand for fish and fish products, the basic character of aquaculture in coastal communities is changing dramatically. Traditional, low production forms of aqua-culture catering to local households are being supplanted by modern, resource intensive high production systems that cater to international markets. This restructuring has generated widespread concern over the contribution of aquaculture to the degradation of coastal ecosystems and the social and economic costs that are being passed on to the rural poor leading to growing inequality (Lakshmi and Rajagopalan, 2000).

There is large-scale conversion of wetlands including mangroves for other uses despite their valuable functioning, products and attributes. Normal market forces always favour the conversion of mangroves (and other wetlands) to other uses and ; many alternative uses of natural mangroves in tropical and sub-tropical coastal areas have produced disappointing economic results due to low and declining productivity (eg. abandoned shrimp ponds due to unscientific shrimp farming in formerly mangrove areas) (Dixon and Lal, 1997).

The large-scale destruction of mangroves for shrimp ponds has adversely affected the productivity of nearby fisheries and consequently the economic conditions of traditional fishermen households. The conversion of mangrove forest into shrimp ponds in the coastal areas in Asia including India is nothing but redistribution of income from poor fishermen to rich investors, mostly non-fishermen marine product industrialists and merchants. (Maler, 1998). The destruction of mangrove forests in India, China, Thailand and other Asian countries is synonymous with the destruction of fishing grounds of the traditional fishermen leading to their occupational displacement.

The livelihood of millions of people depends on shrimp farming around the world, especially in tropical and sub-tropical developing countries. On the other hand, failure to protect the ecosystem and environment from degradation due to shrimp farming is a major concern. The long-term sustainability of this industry depends on its ability to be economically efficient, and at the same time to minimize environmental effects. Therefore, it is important to consider both the economic outcomes and various environmental effects in achieving a more sustainable industry. From this viewpoint, an attempt has been made to explore the key environmental aspects of shrimp farming in the world in general, and in Dhamara area in particular.

Impacts of shrimp farming are mainly in four areas, namely, land resources, water resources, forest resources and fishery resources.

Introduction

This chapter has analysed the impact of shrimp farming on the farmer households. Income and employment generation being two important aspects, impact of shrimp culture on these two are discussed in this chapter. The income generated through shrimp culture is compared with the income from paddy cultivation. Returns to scale and returns to labour from shrimp culture are discussed to know whether shrimp culture is a preferred activity compared to paddy cultivation or not. Besides, the impact of shrimp farming on asset creation, expenditure pattern and savings behaviour of the sample households has been discussed in this chapter.

Marine shrimp farming is a century-old practice. Until a decade ago, this commodity was generally considered a secondary crop in traditional fish farming practices. Shrimp fry trapped in salt beds, coastal paddy fields, or brackish water fishponds are allowed to grow to marketable size and harvested as a secondary crop. However, in recent years when higher income are derived from the harvest of shrimp than the principal crop, many farmers have converted their rice fields, salt beds and fishponds into shrimp farms.

In the traditional farming system, the ponds are stocked with fry either collected from the wild or concentrated through tidal water entering the ponds. Shrimp production is inconsistent and varies from year to year due to the dependence on seasonal supply of fry from the wild. Pond yield is also low (100–300 kg/ha/ year) because of inefficient control of predators and competitors, full dependence on natural food and inadequate pond depth.

Some improvements of the traditional farming methods have been made in the past years. The stocking density of shrimp ponds can be increased through the concentration of fry by pumping more tidal water into the pond. Pond depth is increased to minimize fluctuations of environmental parameters. As a result, pond yield has correspondingly increased. However, the expansion of the shrimp farming industry is still restricted due to the inconsistency in fry supply.

This chapter is framed with different factors relating to socio-economic profile of shrimp farmers in Dhamara coastal zone. Shrimp farming offers significant employment opportunities, which may help alleviate the poverty of the local coastal population in many areas, if it is properly managed. The published literature on that topic shows large discrepancies, and much of the available data is of anecdotal nature. Estimates of the labor-intensiveness of shrimp farms range from about three times less to three times more^] than when the same area was used for rice paddies, with much regional variation and depending on the type of farms surveyed. In general, intensive shrimp farming requires more labour per unit area than extensive farming. Extensive farms cover much more land area and are often but not always located in areas where no agricultural land uses are possible. Supporting industries such as feed production or storage, handling, and trade companies should also not be neglected, even if not all of them are exclusive to shrimp farming.

Typically, workers on a shrimp farm can get better wages than with other employments. A global estimate from one study is that a shrimp farm worker can earn 1.5-3 times as much as in other jobs; a study from India arrived at a salary increase of about 1.6, and a report from Mexico states that the lowest paid job at shrimp farms was paid in 1996 at 1.22 times the average worker salary in the country.

In this chapter, an attempt has been made to review some of the earlier studies related to shrimp farming and its socio-economic and environmental impacts. The related pieces of literature are classified into the following five categories.

Shrimp Pond Management

Economic Impact of Shrimp Farming

Social Impact of Shrimp Farming

Impact of Shrimp Farming on Environment

Acts and Policies Relating to Shrimp Farming

Shrimp culture, a subset of aquaculture is slowly emerging as one of the major and fastest-growing food production sectors in the world. Shrimp that were once caught from the wild are now being cultured using modern aquaculture methods. Thanks to international institutions such as the World Bank, Food and Agriculture Organisation (FAO) etc., who have the encouraged the production of shrimp that fetch huge returns on investment within a short period. Third world countries are also impressed by the potential of this sector to provide food security and to earn huge foreign exchange to redress their debt burdens.

Commercial shrimp farming developed in India on account of the government’s policy to promote shrimp culture because of its potential to utilise the vast saline tracts along the coastline, provide employment opportunities to coastal rural population and to earn valuable foreign exchange. After the liberalisation of the Indian economy in 1991, development of shrimp culture gained greater momentum. Individual entrepreneurs were also encouraged to take up shrimp farming with both financial and technical support.

The market for shrimp is growing by leaps and bounds as they provide a cheap source of protein at only a little above half the cost of producing animal protein. The unique attraction of shrimp being a ‘high-value commodity’ has led to revolutionise its production, currently known as the ‘Blue Revolution’. The revolution has expanded its wings to the coastal areas of Odisha and is becoming one of the most sought out livelihood. The exponential increase in income leading to a dramatic change in the standard of living has lured the people to opt for shrimp culture. In almost all the coastal districts of the state (Odisha), shrimp culture is prominent now.

Flowsheet

Based on various experimentations concerning live fish transportation, a flow sheet may be prepared as:

Evaluation of the health status of the fishes purchased from the market to be packed for transportation. Serrated operculum and spiny fins, if any (as in Anabas testudineus) is serrated as it damages the packing materials. The trimmed fishes are treated with antibiotics and left for a week for wound healing.

In the case of abroad transportation of fish, clearance to the fitness of fishes is made available from a veterinary doctor/inspector. A no-objection certificate is also obtained from the office of the Marine Products Export Organization.

Proper sanitization of all the equipment and accessories for the determination of oxygen uptake of fishes as well as all the other steps of fish transportation in this pandemic of COVID-19.

Determination of oxygen requirement of the fish in terms of per hour and per unit body weight is essential. In the case of air-breathing fishes to be packed (Like Channa punctatus, Anabas testudineus, Clarias batrachus and Heteropneustes fossilis), determination of aerial and aquatic oxygen requirement of the fishes is essential. The oxygen requirement of oxygen was estimated from the calculated values of intercept (=a) and slope (=b). For this calculation, a relationship of aW^b is applied.

Fish transport is a vast area comprising the problems of purely technical design on the one hand, and the chemistry of water, biological reactions of fish and the like, on the other. The above survey could only briefly mention and evaluate the relevant literature on these problems. Because of its purpose, the book was designed not only as an analytical-synthetic survey of pertinent literature but, at the same time, as a practical manual to be used for seeking at least partial answers to practical questions concerning fish transport. The live fish trade is a rapidly expanding component of commercial fishing and aquaculture industries.

Proper sanitization of all the equipment and accessories is one of the essential steps for the determination of oxygen uptake of fishes as well as all the other steps of fish transportation in this pandemic of COVID-19.

In most of the underdeveloped and developing countries, regional diets are monotonous, unbalanced and poor in quality having a high percentage of starchy components and inadequate proportion of protein. The long-term solution to the problem of protein malnutrition lies in the greater production and better distribution of a protein-rich diet. Fish offers protein in a cheap and alternative form. Probably due to this, man has exploited the hydrosphere for food and consequently the history of the development of pisciculture. As the fish perishes rapidly, methods have been devised to keep the fish fresh between the catch and consumption.

The development of fisheries in India has attained considerable progress in increasing the per hectare yield of carps by controlled breeding and rearing of the young ones. Keeping the pace of development, the culture of air-breathing fishes has attracted the attention of aqua-culturists. Many varieties of these fishes have been successfully bred using pituitary extract (Ramaswami and Sundararaj, 1957; Moitra et al, 1979; Thakur, 1976). The traditional methods of transport of spawn, fry, fingerlings and even brooders in various open and closed systems pose major problems due to their heavy mortality. The mortality of live fishes is high mostly due to stress during transportation. For a long, studies on different aspects of transportation of carps and their allies have been carried out by fishery scientists. Some of the works which need special mention are that of Khan (1939, 1946), Ganapati and Chako (1951), Ranade and Kewalramani (1956), Saha and Chowdhury (1956), Saha et al, (1956a and b), Ramchandran (1969), Singh (1977), Selvaraj et al, (1981) and Jha (1995) etc. In comparison to Indian major carps, consumption of air-breathing fish is not so popular although they are a rich source of protein. However, their demand is gradually increasing. Much has to be done to meet the increasing demand of air-breathing fishes to exploit the maximum available derelict water.

The two commercially important Indian air-breathing fishes, Anabas testudineus (Bloch) and Channa punctatus (Bloch) commonly known as climbing perch and snake-headed murrel belong to the order Perciformes and Channiformes respectively. They live in different trophic zones of swamps and derelict ponds and are highly predatory habits. In the present work, oxygen uptake has been observed in Anabas testudineus and Channa punctatus concerning their body weight and group size. The effect of anaesthetic on the oxygen uptake and the effect of ammonia on the structure and function of the gills in Channa punctatus have also been studied. The findings have been used to evaluate suitable methods for long-distance transportation of these fishes. As we surviving in the COVID-19 pandemic, proper sanitization of all the equipment and accessories is one of the essential steps for fish transportation.

Introduction

In the past few decades, there has been a considerable demand for certain air-breathing fishes from India, mainly in the research laboratories of western countries. This is probably due to their unique modifications, especially in the respiratory and circulatory systems. Though, the air-breathing fishes are capable of extracting oxygen both from water as well as air, yet their transportation to long distances in living conditions posed several problems, such as hypoxia, injury, disease and finally death.

Proper sanitization of all the equipment and accessories is one of the essential steps for the study of the structure of gills, determination of oxygen uptake of fishes under normal conditions, under the association, under anaesthetization, under ammonia toxicity and all other steps of packing and transportation in this pandemic of COVID-19.

For effective live fish transportation, inside and out comprehension on the ideal ecological conditions for negligible pressure and greatest endurance is required. At the point when the fish leaves its normal climate, it should be in a self-supportable climate that provisions important necessities, for example, ideal temperature, oxygen and so forth.

Transportation of different life cycle stages (spawn, hatchlings, fry, fingerlings and adults) of fish is traditionally done in different types of containers. The age-old practice of transportation entails heavy mortality probably due to depletion of oxygen, hypertension of carbon dioxide, the toxicity of accumulating wastes, hyperactive strain and exhaustion, infection, injury and variation in pH, temperature, salinity and hardness etc (Jhingran, 1985). A portion of dissolved oxygen is utilized both by the fish and other microorganisms for their metabolism. As a result, the system becomes gradually deplete of oxygen and affects the fish. To overcome the problem of high mortality during transportation, it is essential to evaluate suitable conditions for their transportation. An inexpensive or less expensive method of live fish transport will help our aqua-culturists in many ways.

Introduction

Ammonia has been described as one of the most significant limiting factors for the growth and survival of aquatic living resources among water quality criteria (Russo and Thurston, 1991). Ammonia is a common pollutant of water bodies and forms the main nitrogenous waste in fishes (Tomasso et al, 1980). It enters the river and stream directly from livestock wastes and indirectly via poorly treated waste-water discharge. The chemistry of ammonia in freshwater has been extensively reviewed and its toxicity to the fish is generally expressed as ammonia concentration (EIFAC, 1970; WHO, 1986). Ammonia is produced mainly in the fish liver (Goldstein et al, 1982), it reaches the gills through the blood (Evans and More, 1988), excreted through the epithelium (Evans and Cameron, 1986) and finally released into the water body. The accumulation of nitrogen may induce alternations in branchial tissue and causes fish mortality (Peters et al, 1984; Woker and Wuhrmann, 1950).

Ammonia is a weak base, in the acidic range almost all the ammonia gets converted to ammonium ion (NH₄ ⁺) but only a fraction of ammonia forms such ion at alkaline pH. However, in physiological ranges (pH: 7 to 8) about 2.5% of ammonia exists in a unionized form (Paley et al, 1993). The toxicity of ammonia in water is mainly the result of its unionized form (Richardson, 1997). The unionized ammonia accounts for the major part of metabolic ammonia excretion by diffusion down its concentration gradient (Cameron and Heisler, 1983). The unionized ammonia determines the toxicity level in the water and brings about great problems in pisciculture by causing various diseases (Burrows, 1964; Smart, 1976) and alternations in normal physiology (Cairns et al, 1975; Sarkar and Pramanik, 1986). The ratio of unionized ammonia to the total ammonia mainly depends on the pH and temperature of the freshwater. The concentration of unionized ammonia increases with increasing pH and temperature (Emerson et al, 1975). A rise in temperature and pH from 20⁰C to 25°C and 7.5 to 8.5 respectively gives the fifteen-fold increase in the amount of unionized ammonia.