For a period of 60 days, an experiment was done to examine the growth performance of Indian Major Carp Catla catla fingerlings. The purpose of this study is to look into the effects of soy bean on common carp development and survival (Catla catla). Soybean was added into diets at doses of 1%, 2%, and 3%. There was no supplement in the control diet. The best and statistically significant (p0.05) weight gain was from soybean at 3%. Soybean supplementation produced superior development than 1% and 2% supplementation. The results of this study demonstrate that include soybean in common carp meals increases their growth rate. The soybean diet was shown to be the most beneficial in promoting fish growth.
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For many years, soybean-derived feedstuffs have been employed primarily in diet formulations for the aquaculture production of a variety of fish species. The study’s goal was to investigate the nutritional indices of Indian Major Carp Catla catla fingerlings throughout a 60-day period. The purpose of this study is to look into the effects of soya bean on common carp growth and survival (Catla catla). Soya bean extracts were used in diets at doses of 1%, 2%, and 3%. There was no supplement in the control diet. The best and statistically significant (p0.05) weight gain came from a 3% soybean supplementation. In general, soybean supplementation yielded superior nutritional indices than 1% and 2% supplementation. The results of this study demonstrate that include soybean in common carp meals increases their growth rate. The soybean diet was shown to be the most beneficial in promoting fish growth.
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The present investigation was conducted during April 2019 to March 2020 to find out the seasonal variation in prevalence of ectoparasites of Indian major carps. Total 10 species of ectoparasites were collected from 360 fishes. Out of ten, three belong to Myxozoan (Myxobolus sp., Thelohannellus sp. and Henneguya sp.), three Ciliophporans (Trichodina sp., Tripertiella sp. and Ichthyophthirus sp.), two Monogeneans (Dactylogyrus sp. and Gyrodactylus sp.) and two Crustaceans (Ergasilus sp., and Argulus sp.). Among the different groups of ectoparasites, Myxozoan has shown highest prevalence (19.91%) throughout the year followed by Ciliophorans (17.31%), Crustaceans (9.63%) and Monogenean (1.95%). Among the ectoparasites, Myxobolus sp. is the most prevalent ectoparasites followed by Trichodina sp., Thelohannellus sp., Tripertiella sp. and Argulus sp. It was observed that the infection was the maximum during winter, moderate in summer and minimum in monsoon season.
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The effluents released from different agricultural fields into the local water bodies leads to pollution of the aquatic environment and it is one of the major concern to the present human civilisation. Pesticides, fertilisers and other components of agricultural runoff may adversely affect the metabolism of aquatic organisms by alternating the enzyme activities. The main aim of the present study is to assess the comparative behavioural and physiological responses of Catla catla and Clarias magur exposed to agricultural runoff and also evaluating the toxicity of the agricultural runoff of the Burdwan district, West Bengal. The fingerlings were exposed to agricultural runoff of different concentrations (i.e. 0.0%, 10%, 20%, 30%, 40%, 50%) for 72 hours and their behavioural and physiological changes were observed. Both fish species exhibited abnormal behavioural effects such as random surfacing and erratic movement as well as physiological responses such as increased opercular movement, particularly at higher concentration. However, the adverse effects were more pronounced in Catla compared to Clarias. The present findings indicate that the agricultural runoff is highly toxic to the living organisms and the results could be used for better agricultural practices and in environmental legislation, respectively.
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Nutritional quality of fish depends upon the feed supplied. Supplementary feeding is known to increase the carrying capacity of culture system and can enhance the fish production by many folds. Realizing the importance of formulated feeding the present work was designed to supplement freeze dried tubifex along with the normal groundnut oil cake diet, to evaluate the nutritional indices in juveniles of Catla catla fingerlings. Experimental diet – I comprised of groundnut cake combined with freeze dried tubifex. Experimental diet – II was commercially available freeze dried Tubifex. Control fishes were fed with normal groundnut cake. Fishes initially weighing about 2.5 to 2.8 gms and length of about 6.3 to 6.4 cms were selected for the present study. The formulated feeding was given for a period of 30 days. A significant increase was observed in the body weight, length and the nutritional indices of the fishes fed on both experimental diets.
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