Poultry Visceral Ensilage as A Replacement Ingredient in Fish Feed and Its Effect on Growth, Survival, Gut Histology and Microbiota in Fry of Common Carp (Cyprinus carpio L.)

Incorporating poultry waste in fish feed could reduce the price of fish feed considerably. The study was conducted to test the efficacy of chicken visceral silage as a replacement of fish meal in fish feed formulations. Broiler offal was procured from several slaughter houses and was ground and preserved with acid mixture (sulphuric and formic acid). The fluid ensilage was neutralized and sun dried to obtain dry silage. Common carp fry (average weight 0.71g) were used as experimental fishes for the study. 5 kinds of feeds were formulated for the experiment at inclusion levels of 0, 5, 10, 15 and 20% of visceral silage replacing equal amounts of fish meal. Triplicate tanks were set up for each group of formulated feed. Feeding trials were conducted for a period of 60 days. At the end growth parameters and histopathological studies were done. The growth parameters suggested significant increase in Weight Gain and SGR (p<0.05) in treatment T4 (20% inclusion of visceral silage). Also, comparative study of histopathology of intestine and liver showed no major diseased conditions. Thus, it concludes that broiler visceral silage could be a potential replacement of fish meal in feed formulations.