Influence of feeding regime on fatty acid composition in young
red-spotted grouper Epinephelus akaara
D.-S.
Jeong, Y. Kayano, T. Oda, H. Nakagawa-2003
Fisheries
Science, 69(3):
569-574
Abstract:
Young
red-spotted grouper Epinephelus akaara with an average total length
of 3.4 cm were divided into five groups in floating net-cages, and
reared under satiated conditions with different feeding frequencies (0.5, 1,
2, 4 and 8 times per day) for 40 days. Total food intake increased with
feeding frequency. Feeding four times per day resulted in the highest growth
and food conversion efficiency. Total lipid accumulation in the muscle,
liver and intraperitoneal fat body (IPF) increased with feeding frequency.
Red-spotted grouper were found to contain a high proportion of
docosahexaenoic acid (DHA) in the muscle. Fish fed 0.5 times per day were
characterized as having a high proportion of DHA in triglycerides (TG) in
muscle (80%), liver (69%) and IPF (18%). Increasing saturated fatty acids
and a relative reduction of DHA were observed in the muscle TG as the
feeding frequency increased. Frequent feeding accelerated the accumulation
of eicosapentaenoic acid and saturated acids in the liver and IPF. Low
saturated acids and a subsidiary proportional increase in DHA were the
result of the low lipid reserves. A possible role for DHA and saturated
acids are discussed with regard to lipid reserves.
(Graduate School of Biosphere Science, Hiroshima
University, Higashi-hiroshima, Hiroshima 739-8528, Japan, Tel:
81-824-24-7989.
Fax: 81-824-22-7059. Email of H. Nakagawa: