Effects of Two Types of Rotifer on First-feeding Success and Early Survival in Coral Trout <I>Plectropomus leopardus</I> Larvae
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概要
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Effects of two types of rotifer <I>Brachionus rotundiformis</I>, common S-type (Lorica length mean 169μm) and small S-type of Thai strains (Thai-type, mean LL 145μm), on first feeding success and post-first-feeding survival in a mass seed production scale of coral trout, <I>Plectropomus leopardus</I> larvae were investigated. Two 60 <I>kl</I> concrete tanks were used for the experiment: one contained S-type and the other Thai-type rotifer of which densities were maintained at 15 ind./<I>ml</I>. The experiment was repeated twice. In the 2nd trial, one additional tank was prepared as a negative control fed Thai-type rotifer under 24 hrs darkness. The larvae started feeding since 3 days after hatching (DAH) and the experiment was finished 5 DAH. The larvae were sampled every 2 hrs to examine feeding incidence and the gut contents between 5 am and 11 pm on 3-4 DAH. In both 1st and 2nd trials of the time attained more than 50% average feeding incidence of the larvae was two hours faster in Thai-type rotifer feeding tanks than in S-type rotifer tanks on the first feeding day (3DAH) . The average rotifer number eaten by a larva was significantly higher in the former tank than the latter on 3 DAH. On the contrary, negative control tank showed the lowest feeding incidence and lowest number of rotifer in the gut. Survival rate on 5 DAH was higher in Thai-type rotifer tank than in S-type one in both trials. These results suggested that Thai-type rotifer is recommended from the viewpoint of first feeding success and the following survival. Tryptic activity was clearly noticed just after the first feeding of larvae fed Thai-type and S-type rotifer.
- 日本水産増殖学会の論文
日本水産増殖学会 | 論文
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