PARTIAL REPLACEMENT OF FISHMEAL WITH TUNA LIVER MEAL IN DIETS FOR COMMON CARP
FRY, CYPRINUS CARPIO L. 1758
GÜMÜŞ, Y. KAYA, B. A. BALCI AND B. B. ACAR
Faculty of Fisheries,
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)
values for live weight gain, specific growth rate, condition factor, better feed
conversion ratio and protein efficiency ratio compared to the others. Survival
range was from 70 to 87.5%. However, fish fed diet 6 exhibited lower growth and
survival than those fed other diets. Apparent protein and lipid digestibility
values for fish fed diet 2 or diet 3 were higher than the others. There were no
significant (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.
fish meal, tuna liver meal, growth, digestibility.