Wullur, Stenly and Sakakura , Yoshitaka and Hagiwara, Atsushi
(2008)
Significance of minute rotifer Proales similis as live food.
5th World Fisheries Congress, Yokohama – Japan. October 20-25, 2008.
Abstract
The body size of Proales similis (mean±SD = 80.7±9.1 µm). Due to its small size, P. similis can be utilized as first food for fish larvae, which require small food item. In this study, the effect of HUFA enrichment on lipid composition of P. similis was investigated. P similis, SS-type B. plicatilis were fed alone or in combination to seven-band grouper Epinephelus septemfasciatus larvae, and the effect on feeding, growth, survival and tryptic activity of the larvae was examined. HUFA enrichment on P. similis resulted in higher total lipid content; 2.4% (per dry weight) for unenriched and 2.5% (per dry weight) for enriched group. Compositions of 22:6n-3 (0%), 18:3n-3 (0%) and 18:2n-6 (3.3%) in percent total lipid also increased to 17.5%, 4.5% and 19.7%, respectively. Higher survival rate of the seven-band grouper larvae was observed when P. similis was used as food. High initial feeding was detected in dietary treatments containing P. similis compared to SS-type alone. Larvae in mixed treatment demonstrated significantly faster initial growth and higher tryptic activity
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