サイズの異なる2タイプのワムシがスジアラ仔魚の初期摂餌と初期生残に及ぼす影響

DOI 日本農学文献記事索引 Web Site 被引用文献8件 参考文献22件

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タイトル別名
  • Effects of Two Types of Rotifer on First-feeding Success and Early Survival in Coral Trout <I>Plectropomus leopardus</I> Larvae
  • サイズ ノ コトナル 2 タイプ ノ ワムシ ガ スジアラシギョ ノ ショキセツジ ト ショキセイザン ニ オヨボス エイキョウ

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説明

Effects of two types of rotifer Brachionus rotundiformis, 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, Plectropomus leopardus larvae were investigated. Two 60 kl 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./ml. 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.

収録刊行物

  • 水産増殖

    水産増殖 51 (1), 101-108, 2003

    日本水産増殖学会

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