H.M. Su, M.S. Su, I.C. Liao-1997
Hydrobiologia, 358: 301-304 (from Current Contents)
Abstract:
Fertilized oyster eggs, S-rotifer (Brachionus rotundiformis) and SS-rotifer (Brachionus sp.), were tested either solely or in combination for their suitability as feed for early stage grouper (Epinephelus coioides) larvae. Sizes of S-rotifers ranged between 143-224 mu m lorica length with mean 182 +/- 21 mu m, and SS-rotifers between 122-176 mu m lorica length with mean 154 +/- 13 mu m. The results indicated that both fertilized oyster eggs and SS-rotifers were suitable as feed at F1 (first feeding day). However, poor growth was recorded when providing oyster eggs solely for the periods F1-F3. Although growth of larvae at F6 had no difference between the sole SS-rotifers and the oyster eggs additionally provided for F1-F3, better survival of larvae at F15 was obtained when providing combinations of SS-rotifers with oyster eggs for F1-F3. Besides, better growth and survival of larvae at F15 was found when providing S-rotifers enriched with Kirin yeast for F7-F15. The highest survival and fastest growth of larvae at F15 was found when providing oyster eggs for F1-F3, SS-rotifers for F1-F6, S-rotifers for F7-F15, both rotifers enriched with Kirin yeast, and Isochrysis for F1-F15. Total fatty acid (TFA), EPA, DHA content, and DHA/EPA (D/E) ratio of larvae changed with their sizes and corresponded to that of their feeds. The F15 larvae having a higher TFA grew faster, having higher DHA or EPA survived better.
(Taiwan Fisheries Res. Inst., Tungkang Marine Lab., Tungkang Lab., Tungkang 928, Taiwan)