Effect of Fish Offal Meals as Animal Protein on Digestibility of Common Carp (cyprinus carpio L.)

Abstract The objective of this research was to find out how digestible six different pelleted fish diets were in terms of dry matter and protein. Using chromium dioxide as an inert bio-marker, the six pre-treatment diets were tested on the performance of common carp fingerlings. Treatment T1 included commercial fishmeal and treatment T2 did not contain fish offal meal supported with commercial protease enzyme. Treatments 3, 4, 5, and 6 all contained fish offal meal supported with protease enzyme in proportions of 1.5, 2, 2.5, and 3%, respectively. The experimental diets were designed to have the same amount of calories and protein. Chromium concentrations, proximate components of test diets, and feces were also calculated. T4 had the highest ADC for dry matter (DM) at 86.43%, while T3 had the lowest at 73.35%, according to the results. The ADCs values for crude protein content were also highest in T4 (91.92%), and lowest in T3 (80.20%). According to the research, common carp can maximize their nutritional digestion with the help of used fish offal meal and up to 1.5% protease enzymes in their diet.