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Essay On Fish Production

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Delince (1992) emphasized that the factors which significantly influence fish production, act within a network of interactions. The three main factors are; availability of food (ad libitum), dissolved oxygen and the ammonia concentration of water. Our studies also reported that low fish production coincides with high BOD, high ammonia and low DO. Cuenco et al. (1985) study of environmental factors affecting the population growth of American catfish, showed that, besides available food and oxygen, non-ionized ammonia in the water is also an important factor.
The natural food of the studies fishes have been determined by several works by examining the gut contents (Kumar et al., 2007; Kumar and Chakarbarti, 1998; Chakarbarti, 1998; Jhingran, 1988 and Barrington, 1957) which revealed that they are planktivorous. Analysis of gut contents of Catla catla indicated that apart from debris/decaying matter, Bacillariophyceae and Chlorophyceae were the dominant group. Although detritus/debris was high, the preferred food items as …show more content…

Fish are quite specific in the digestion capability of different groups of food. It is necessary to understand the relationship between the type of food consumed and the quality and quantity of enzymes produced in the alimentary tract. It was observed that specific cellulase and amylase activities were higher in Catla catla which also advocate the phytoplanktivorous feeding habit of this fish species. It was further observed that these activities are higher in managed ponds in comparison to unmanaged ponds. Sarbahi (1951), Dhage (1968) and Philips (1969) suggested that amylase activity in the intestine of herbivores carps is more intensive than the carnivorous fishes. Bairagi (2002) reported the presence of amylolytic bacteria (responsible for exogenous amylase production) from the gut of Catla catla even after 24 hours of

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