• Yagana Bano

      Articles written in Proceedings – Animal Sciences

    • Changes in chemical composition during growth ofClarias batrachus (Linnaeus)

      Yagana Bano

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      In the muscle ofClarias batrachus, variations in total nitrogen, protein nitrogen, non protein nitrogen, total water and water soluble nitrogen, total protein, pure protein, albumin, fat, moisture, ash, total inorganic and acid soluble phosphorus were found markedly influenced by the size of the fish. Excepting the ash which decreased upto 2nd size group, a substantial faIl in the relative concentration of these constituents was noted with the increasing length, the minimum being in 3rd size group. The fishes of larger size group (4th size group) contained slightly higher values. The fat value increased with the increasing size up to 2nd size group of fishes, whereas in the other size group, its value remained low. The moisture contents were found inversely related with the fat contents. The observed variations in different chemical constituents of fish with the increase in size appear to be related to the metabolic variations occurring during the growth and maturation cycle. In all size groups the electrophoretic patterns were more or less identical.

    • Effects of aldrin on scrum and liver constituents of freshwater catfishClarias batrachus L.

      Yagana Bano

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      The changes in total protein, total phosphorus, calcium and cholesterol contents wore observed in serum and liver of treated and control fishClarias batrachus L. Alerin caused more pronounced effect in liver than in serum. Values remained significantly low in liver of experimental fish than in control, while the serum constituents fluctuated widely. The variations observed in different values are explained as transfer or development of tolerance. A constant increase of cholesterol in serum corresponding to a regular decrease in liver is interpreted as deportation of cholesterol from liver to serum as a result of liver damage by aldrin poisoning.

    • Seasonal variations in the phosphorus contents of the muscle of catfishClarias bairachus L.

      Yagana Bano

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      Seasonal variations were observed, in total acid soluble phosphorus, inorganic phosphorus and phosphorus in the muscle ofC. batrachus L. The maximum concentration of these constituents were recorded during April, May and June. Thereafter values decreased and the levels remained low during winter months. The observed changes have been correlated with feeding intensity, gonad maturation and spawning. The rise and fall of different phosphorus contents were found to coincide with high and low rate of feeding. There was a gradual rise in the values when gonads advanced towards maturity. The maximum concentration corresponded to the period of peak ripeness (April, May and June). The values declined during the spawning period which possibly indicate the utilization of these reserves for energy. The low phosphorus contents observed in post-spawning and winter appear to be the result of exhaustion of spawning.

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