Abstract
Areliscus trigrammus (GUNTHER) is a Cynogrossoid sole, distributed along the Pacific coast from SHIZUOKA PREFECTURE to southern Japan, Formosa and East China Sea. It inhabits mud or sandy mud bottom. The spawning season seems to extend from March to early April at the offing of SHIMABARA CITY, ARIAKE BAY. The eggs are bouyant and colorless, spherical in shape measuring 1.19-1.23mm in diameter, with 30-50 oil-globules measuring 0.068-0.095mm, and any particular structures are not seen on the egg-membrane and yolk. On March 23, 1963, the authors carried out the artificial insemination at SHIMABARA CITY, KYUSHYU and observed egg development and hatched larvae. The incubation period was about 100 hours at the water temperature 13.0-14.5°C. In the course of development, melanophores and xanthophores appeared on the embryonal body and yolk. At 76 hours after insemination, the melanophores and xanthophores which had been situated on the yolk until that time gathered on the oil-globules. The newly hatched larva was 3.18mm in total length with 54-55 (13+41 ?? 42) myomers. The xanthophores and melanophores formed five cross bands on the trunk and caudal part of the body. The larval fins were free from any chromatophores. A two day old larva was 4.32mm in total length with 56 (10+46) myomers. A tubercular process appeared in the larval fin at the back of the head. A ten day old larva attained 4.95mm and entirely consumed its yolk. The tubercular process developed into a ribbon-like fin.
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