駿河湾産センハダカの生態学的研究-I : 年令査定の方法と寿命

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An ecologic study of a myctophid fish Diaphus suborbitalis has been made to find out the prey-predator relationship between this fish and the commercially important sergestid shrimp in suruga Bay. This paper describes the method of determining the age of individual fish as a preliminary to describing age structure and composition of the stock. Sampling was made at night by Isaacs Kidd midwater trawl and shrimp and shrimp net, from September 1974 to July 1975, usually at monthly intervals. As a result of otolith ring analysis, the transparent ring was proved to be formed during summer and winter, and the opaque ring during spring and early summer. A pair of these two rings occurs once a year and corresponds to one year of age. Maximum age of this species is estimated to be at least 2.5 years. The relationship between the standard length of body and the radius of the otolith is linear. Standard length backcalculated, using the above linear relationship, is usually underestimated, indicating the presence of Lees phenomenon.
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