Application of Higher Feeding Levels Prompts Larval and Juvenile Japanese Flounder to Take Food at a Higher Rate.

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Effects of four different feeding levels (L1, L2, L3, and L4) on food ingestion of laboratory-reared larval and juvenile Japanese flounder <I>Paralichthys olivaceus</I> were studied from 12 to 36 days posthatch. In test 1, the food densities at L1, L2, and L4 were 0.5, 2.5, and 5 times that at L2. Feeding level L2 has conventionally been adopted by some hatcheries located in the western part of Japan for the mass propagation of Japanese flounder larvae and juveniles. The mean number of food organisms in the digestive tracts in L4 feeding level was greatest followed by L3, L2, and L1. The number of brine shrimp nauplii eaten increased for all feeding level with growth, because of selection by the larvae. In test 2, only L2 feeding level was applied in all the four different feeding levels fed-raised flounder groups (L1, L2, L3, and L4) separately. In this test a similar result as test 1 was observed; the obtained results suggest that the application of increased feeding levels does enhance the feeding response of larval and juvenile Japanese flounder. In both tests a few juveniles bigger than 16 mm in total length ate rotifers.
日本水産増殖学会の論文