大和堆ズワイガニChinoecetes opilioの生態と分布

概要

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As a result of collecting nekton and nektobenthos with trap nets in the waters around Yamato-tai, Zuwaigani (Chionoecetes opilio) which is one of the most important fishery stock in the Japan sea were caught in abundance. And so authors studied the distribution and ecology of Zuwaigani on the basis of the data obtained. The results obtained are summarized as follows; 1) Nekton and nektobenthos could not be collected successfully with trap nets set in the intermediate layer. But on the ocean floor they could be successfully collect. 2) It can be guessed that the living extent of a Zuwaigani's school is between 200m and 400m. and the density at the center is high, becomes lesser and lesser away from the center. 3) It seems that the distribution centers of the male and female Zuwaigani are different. 4) The carapace width of Zuwaigani (male) was from 50mm to 120mm in extent and their body weight mode was 200g. Female was 53mm to 72mm in extent and their body weight mode was 90g. 5) The crabs (Zuwaigani) which broke off their legs by autotomy were 69 (66.3%) individuals among 104, and the number of legs broken off by autotomy was less than four legs each. 6) The percentage of individuals having black materials (generally known as Susu) attached to them was high.
日本水産學會の論文