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Detailed background have been given in Chapter – 1 about the production of fish from natural resources. It is necessary to have sound knowledge about the various systems of fishing and their status. Analysis on scientific lines should be done so as to frame the sound policy to obtain the sustainable fish production. This has been described in Chapter – 2. Proper legislation and Act are needed to harvest and conserve the fish production regularly from the natural water bodies and are explained in Chapter – 3. The fish and fisheries in rivers and reservoirs are vary important. Estuaries, Back Water, flood plain lakes and Mangroves are very important for the production of fish. This has been given in Chapter – 4. All the civilization were developed on the bank of water bodies. In modern time lot of sewage and industrial effluents are released in natural waters untreatedly which causes the huge pollution. The pollution creates harms to the aquatic organisms. Implementation of Prevention of Water Pollution Act is very necessary so as to keep the various parameters of water. This have been explained in Chapter – 5. Study of fish population dynamics and different type of fish species is very important. Such studies are required to frame future policies and plants. This have been given in Chapter – 6. Cold water in the shape of rivers and lakes is available in plenty. It forms the good
fisheries of indigenous and exotic fishes. This have been explained in Chapter – 7. Approved and efficient gears and crafts are required for harvesting the fish and aqua-organisms. Selective and optimal fishing should be done to have the sustainable and regular fish production. Sale of fish and aqua-organisms is made in organized manner to get the maximum returns. This has been explained in Chapter – 8. The quantity and quality of water is changing day by day. The nutrients and chemicals are changed very frequently. Hence, genetic improved and hard fishes are needed to survive in hard environment. Hybridization and gene manipulation is required. This has been given in Chapter – 9. The self life of fish is very short. The purification is started as soon as fish is taken out of water. Hence, proper storage and processing are required to use fish for the long time. In addition to food, the fish can also be used of by-products also. This have been described in Chapter – 10. In addition to food and other products, fish can also be used as entertainment and sports. Some of the fishes also give very entertainment in angling sports fishes, equipments and technique of angling are given in Chapter – 11. World is fast moving and progressing. New methods and techniques are used to communicate the information from one corner to another by various devices. The information technology of fisheries has been given in Chapter – 12.