Syeda Maksuda Yeasmin , Md. Habibur Rahman , Md. Anisur Rahman , Abdulla-Al-Asif ,Md. Almamun Farid, Md. Masum Billah
The aim of the experiment was to determine the effects of three types of formulated feed containing varying levels of protein, lipid on breeding performance of common carp (Cyprinus carpio). C. carpio was reared for 120 days under three dietary treatments (T1 to T3) with varying crude protein levels and crude lipid levels. Experimental diets T1, T2 and T3 were formulated from locally available feed ingredients having crude protein percentage of 23.56 ± 0.23, 28.60 ± 0.10 and 18.04 ± 0.32; crude lipid percentage of 9.50 ± 0.22, 11.06 ± 0.38 and 8.34 ± 0.19 respectively. Effect of the three diets was studied in terms of gonadosomatic index (GSI), fecundity, fertilization rate, hatching rate and deformity of fry. Fishes reared under Treatment 2 showed the highest gonadosomatic index (32.08 ± 7.24%), fecundity (355963.33 ± 77142), fertilization rate (84.00 ± 6.89%), hatching rate (87.33 ± 12.45) and lowest rate of larval deformity (11.56 ± 3.56%). Brood stock management of Treatment 2 showed significantly better results (P<0.05) in respect of gonadosomatic index, fecundity, fertilization rate, hatching rate and larval deformity among three selected hatcheries. Hence, it can be concluded that 28.60 ± 0.10% protein and 11.06 ± 0.38% lipid is adequate for better breeding performance of common carp (Cyprinus carpio).