豊後水道および日向灘のカタクチイワシにおける感染仔虫の寄生状況について (養殖ハマチに寄生する嚢虫に関する研究-6,7-)

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In a previous paper, it was reported that the anchovy worm which shows up in the body cabity of Engraulis japonica (HOUTTUYN) is a pre-staged larva of the bladder worm found in Seriola quinqueradiata TEMMINCH et SCHLEGEL. The present investigation was carried out so as to elucidate seasonal changes in the occurrence of anchovy worms in the Bungo Channel and the Hyuga Sea in connection with the migration of the 3 seasonal groups of anchovies, spring-, summer-and autumn-hatched in the mentioned areas. Seventy one samples of anchovies (17, 017 fishes in total) were collected at various seasons, from March 1968 to November 1970, from different localities. The study revealed that the incidence of worm carring fishes differed definitely among the 3 anchovy groups. The occurrence rate of fishes carring the worms estimated with samples consisting of 7 to 11 months old fishes were 10.8 ?? 25.0% (average 19.2%) in spring-hatched group (12 samples), 4.2 ?? 15.4% (9.5%) in summer-hatched group (14 samples) and 1.1 ?? 7.7% (3.8%) in autumn-hatched group (17 samples). The incidence in the other 28 samples which were estimated to be under 6 or over 12 months old was relatively low, and no worm was found in the 3 and 4 months old samples. The smallest fish which harboured the worm was 7.6cm in body length (sample No. 7). Out of the 71 sample groups, 53 samples were caught in the Uwa Sea, the north eastern part of the Bungo Channel. A definite seasonal variation in the incidence of the worm was noticed in this area throughout the 3 years, being highest in autumn and winter and lowest in summer. These seasonal variations were satisfactorily explained from the annual migration modes of the 3 hatching groups which markedly differed from each other in the incidence of the worm.
日本水産學會の論文

豊後水道および日向灘のカタクチイワシにおける感染仔虫の寄生状況について (養殖ハマチに寄生する嚢虫に関する研究-6,7-)

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