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Introduction to broodstock nutrition of cultivable catfish in India—part 2 In India, the steady growth in freshwater aquaculture is led by the recent production of catfish, with a share of around 10-15% of the inland sector. Part 1 of this article (Hatcheryfeed magazine vol 5 issue 3) provided an overview of the effects of nutrition on fecundity, fertilization and embryo development of broodstock fish and larva quality and the proteins and amino acids requirements of broodstock. In this second part, nutrient requirements are further discussed along with feeding practices. Pabda (Butter catfish ) harvest.

By Priya Rawat, Pradyut Biswas, Alok Kumar Jena Department of Aquaculture, College of Fisheries, Central Agricultural University (I), Tripura-799210, India

Carbohydrates Like proteins and lipids, carbohydrates are also a group of compounds composed of carbon, hydrogen, and oxygen; metabolized in the fish body to produce energy. In general, fish don’t have specific dietary requirement, but carbohydrates are always included in fish diets as they are inexpensive energy source and acts as a pellet binder. They serve as an energy source, tissue constituents (e.g., blood glucose, liver

glycogen, and nucleotides), and precursors of certain metabolic intermediates needed for growth. Carbohydrates have a sparing effect on utilization of dietary protein in many aquaculture species. Proper dietary balance of carbohydrates would enable fiber to move other nutrients in gastrointestinal tracts for proper digestion. Ability to use dietary carbohydrates as an energy source differs among fish species. Most fresh and warm-water fish,

including catfish, can use much higher levels of dietary carbohydrates than coldwater or marine fish. This may be attributed to the fact that warm-water fish have a much higher intestinal amylase activity than coldwater species. Most carnivorous species have limited ability to metabolize it. The polysaccharides dextrin and starch are well used by catfish. However, utilization of monoand disaccharides by catfish is not as efficient. Studies indicate that catfish

Hatcheryfeed vol 5 issue 4  
Hatcheryfeed vol 5 issue 4  

The latest in feed and nutrition for early life stage and broodstock aquatic species. Hatcheryfeed is a quarterly magazine from