EFFECT OF VARIOUS FISH MEALS AS
DIETARY PROTEIN SOURCES ON GROWTH AND BODY COMPOSITION OF JUVENILE FLOUNDER (Paralichthys
olivaceus)
S.-M. Lee, H.-S. Jang
Dietary proteins are the most
important factors affecting growth performance of fish and feed cost.
Generally, most of the formulated diets for marine fish include a large
amount of fish meal as a protein source because of its high nutritive value
and palatability. Quality of fish meal in diet may affect on growth and feed
efficiency of fish. Therefore, this study was conducted to evaluate the
effect of various fish meals as dietary protein source on growth and feed
utilization of the juvenile flounder.
Ten experimental diets containing
different fish meals were prepared: 4 kinds of white fish meals
(WFM-A, B, C and D), 3 kinds of herring fish meals (HFM- E, F and G),
mackerel fish meal (MFM), WFM mixture and brown fish meals (BFM) mixture. Dietary energy
and protein levels were designed to be isocaloric and
isonitrogenous by adjusting the levels of fish meal, wheat flour and
squid liver oil. Three replicate groups of fish (initial mean weight: 11.1
g) were
hand-fed to visual satiety two times daily for 7 weeks.
Survival was not significantly
affected by dietary fish meal kinds. The best weight gain was observed
in fish fed diets containing HFM-E and HFM-G, and this was not different to
that of fish fed diets containing WFM-B and BFM mixture. Feed
efficiency and protein efficiency ratio of fish fed diets
containing WFM-B, HFM-E, HFM-G, MFM and BFM mixture were higher than those
of fish fed other diets. Moisture, crude protein, lipid and ash contents of whole
body in fish were significantly affected by various fish meal as dietary
protein sources. The results of this study indicated that WFM-B, HFM-E,
HFM-G and BFM mixture could be an appropriate for the optimal growth of juvenile flounder.
(Faculty of Marine
Bioscience and Technology, Kangnung National University, Gangneung 210-702,
South Korea)