ムシガレイとヤナギムシガレイの初期発生と仔魚飼育

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Eopsetta grigorjewi (HERZENSTEIN) and Tanakius kitaharai (JORDAN et STARKS) are cammon flatfish in Japan. The spawning season of these fishes seems to extend from Junuary to early March in the western part of Yamaguchi Prefecture. The author carried out the artificial insemination at Senzaki Machi, Yamaguchi Prefecture on February 28, 1960 and reared the hatched larvae in the glass jar, feeding with fertilized eggs of the sea-urchin and brine shrimp nauplii. The eggs of both species are colorless and bouyant, spherical in shape, with no oil-globule. The outer surface of the egg-membrane of these fishes has faint network sculaptures. The egg of E. grigorjewi is measured 1.10-1.20mm and T. kitaharai is measured 1.20-1.30mm in diameter. The incubation period of E. grigorjewi is about 93 hours and T. kitaharai is 103 hours at the water temperature 11.0-13.8°C. The newly hatched larva of E. grigorjewi is 3.0-3.2mm in total length, with 44-45 (12 ?? 13+32) myomers. The yolk is absorbed in 5-6 days. The larvae are free from any cross band of the chromatophores. 12 days after hatching, the larvae all die out. The newly hatched larva T. kitaharai is 3.4mm in total length, with 51-54 (11 ?? 12+40 ?? 42) myomers. Many melanophores and xanthophores are distributed on the larval fins as well as the body. In 2 days the xanthophores form three cross bands on the tail part of the body. The yolk is consumed in 5 days. In 29 days one of the reared larva attains 7.5mm in total length. The eyes are located symmetry on both sides of head.
公益社団法人日本水産学会の論文

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藤田矢郎
長崎県水産試験場

ムシガレイとヤナギムシガレイの初期発生と仔魚飼育

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