1986年秋日本以南和以东海域仔稚鱼的分布

Distribution of larval and juvenile fishes in the waters south and east off Japan in Autumn, 1986

１９８６年１０～１１月在日本以南和以东海域的４１个测站进行了鱼卵、仔鱼的调查，共采集到９９６尾仔稚鱼，它们隶属于３８科６７种，经济鱼类仔鱼稀少，而大洋性发光鱼类仔鱼十分丰富，其中钻光鱼科和灯笼鱼科分别占仔鱼总数的５０．５０％和３２．３３％。优势种为细钻光鱼、串灯鱼和西明灯鱼，它们分别占仔鱼总数的２５．３０％，１６．４７％和７．５３％。仔鱼的丰度在黑潮流轴外侧边缘及其邻近的大洋域最高，在日本以南的沿岸水域占第二位，而在日本以东的混合水域最低。仔鱼丰度与温、盐度之间有显著的正相关关系。

The material discussed in this paper was collected by a standard plankton net (569 μm.mesh, 80 cm. mouth diameter, 270 cm. length) towing vertically from 200m depth to the surface in the waters south and east off japan in October - November, 1986. A total of 41 trawl collections were made. Fish larvae were present in 97.56% of all samples (n = 41) and 996 larvae comprising 67 species in 38 families were collected. The larvae of the commercial fishes were rare while those of the oceanic lumincescent fishes were clearly abundant, of which the families Gonostomatidae and Myctophidae dominated the samplesand made up 50.50 and 32.33%, respectively, of the total larvae taken. Gonostoma gracile,Vinciguerria nimbaria and Diogenichthys atlanticus were dominant species and accounted for 25.30, 16.47 and 7.53% of all specimens collected, respectively.The abundance of fish larvae was largest in the outer edge of the Kuroshio axis and its adjacent oceanic waters, and it took second place in the coastal region south off Japan and wassmallest in the mixing waters east off Japan.The correlations between a total abundance of fish larvae and temperature, salinity in the surveyed waters were positive and high significant.