ヒラメ仔魚の鉛直分布と食性〔若狭湾に出現する仔魚の食性に関する研究-1-〕

概要

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Examinations were made of the vertical distribution and gut contents of larvae of flounder Paralichthys olivaceus (TEMMINCK et SCHLEGEL) collected with larvae nets (160cm mouth diameter and GG54 mesh size) in the western Wakasa Bay belonging to the Japan Sea during a period from May to July 1981. The larvae distributed abundantly in the shallow waters, especially in the waters between 25m and 50m depth. From estimation of the vertical distribution of the larvae, less than 3.0mm BL with a yolk-sac, it was implied that the flounder eggs hatched out around a depth of 25m. The larvae fed mainly on Oikopleura longicauda, Evadne nordmanni, Penilia avirostris, Paracalanus parvus and copepod nauplii. There appeared a variety of diets found in the gut through the survey period. The monthly varation may closely related with a species composition of plankton community in the area. According to the relationship between the gut contents and plankton compositions in the area, the larvae has selection for plankton species. The size of prey increased with the growth of larvae in body length, and the larvae showed a favorable size selection of prey.
日本水産學會の論文