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L 型ワムシ 2 株と S 型ワムシ 1 株を用いホシガレイブリヨシノゴチ仔魚の成長に伴う摂餌選択性の変化を魚種間で比較した。L, S 型ワムシは被甲と後頭棘の形状が異なるものの被甲サイズが等しいときには3 魚種ともに L 型と S 型ワムシを区別せずに同じ割合で摂餌した。開口直後では3 魚種とも小型のワムシを選択したがホシガレイヨシノゴチ仔魚では 10 日令以降ブリ仔魚は 16 日令以降に大型のワムシを専食した。各魚種の口径が等しいときヨシノゴチ仔魚は他の 2 魚種よりも大型のワムシに対して強い選択性を示した。We compared the feeding selectivity of three marine fish larvae, spotted halibut, yellowtail and flathead, according to their growth by using two strains of L-type rotifer and one strain of S-type rotifer. In the experiment on the selectivity to shape of rotifer lorica (L and S-type), the larvae of the three species showed similar selectivity though the shape of the lorica and the anterior spines were different. In terms of rotifer size selection, the larvae of the three species positively selected smaller rotifer at the onset of feeding. However, the selection shifted to larger rotifers on 10 DAH for spotted halibut and 16 DAH for yellowtail and flathead larvae. By comparing the selectivity based on mouth size, flathead larvae showed strong selectivity to larger rotifers than spotted halibut and yellowtail larvae

nihon suisan gakkaishi/nippon suisan gakkaishi

Feeding selectivity of marine fish larvae, Verasper variegatus, Seriola quinqueradiata and Platycephalus sp. on different sizes and shape of three rotifer strains