GROWTH, HAEMATOLOGY, NUTRIENT RETENTION AND HISTOLOGY OF AFRICAN CATFISH, Clarias gariepinus FINGERLINGS FED LARVAE OF Musca domestica
Keywords:Maggot meal, feed utilization, alternative protein, aquaculture, diet formulation
A 56-day feeding trial was conducted to evaluate the effect of feeding diets containing Musca domestica larva meal on African catfish (Clarias gariepinus). Five isonitrogenous diets were formulated containing 0, 25, 50, 75 and 100% Musca domestica larva meal replacing fishmeal. Fingerlings (n=225) of African catfish were distributed randomly into triplicate groups of each of the five dietary treatments. Assessment of the effect was done using growth performance, haematology, histology of the liver, as well as kidney and intestine using standard procedures. The second-order polynomial regression model showed the best replacement level that supported optimum weight gain was 80 % with the 0.8477 coefficient of determination that showed a proportion of variation in the dependent variable (weight gain) that was explained by the independent variable (inclusion level). The protein retention by the fish group fed MGM50 was the highest. However, the MGM100-fed fish group significantly had higher lipid and energy retention. Fish fed MGM75 had the highest value of primary and secondary haematological parameters which was not significantly different (p > 0.05) from the MGM50-fed group. There was no significant inflammation and no abnormality seen in fish gut across dietary treatment groups. There were no features of acute and chronic damage in the fish liver and kidney across dietary treatment groups. The liver section of fish fed diets MGM100 showed glycogen accumulation in the hepatocytes. Therefore, feeding Musca domestica larva meal improved growth and impacted no features of acute or chronic injury to the health status of African catfish.