PARTIAL REPLACEMENT OF FISHMEAL WITH TUNA LIVER MEAL IN DIETS FOR COMMON CARP FRY, CYPRINUS CARPIO L. 1758

Abstract

Tuna liver meal (TLM) was tested to replace fish meal (FM) in diets for carp fry, Cyprinus carpio Linneus, 1758. Triplicate groups of fish with average weight of 0.32 ± 0.65g were fed each of six isonitogenous (42%), isolipidic (16%) and isoenergetic (18 KJ DE g -1 ) diets prepared to include 0, 10, 20, 30, 40 and 50% (diets 1- 6, respectively) of FM protein being substituted by TLM. The control diet contained fish meal (17.14%) and soybean meal (46.9%) as the main sources of dietary protein. After 13 weeks of feeding, fish fed diet 2 and diet 3 exhibited the highest (P 0.05) differences in the crude protein and ash content in the whole-body. However, moisture and lipid contents were significantly (P<0.05) affected by dietary treatments. These results indicate that up to 20% of FM protein in fish diet can be replaced by TLM without adverse effects on fish growth, feed utilization and body composition.