オホ-ツク海のズワイガニ漁獲物の令期細成について

概要

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To examine the method of estimation of age composition of the tanner crab, Chionoecetes opilio, the frequency distribution of the carapace width was analized, basing on an assumption that the variation of the carapace of a single moulting age is subject to a normal distribution. In samples collected in the south Saghalien area in 1971, the frequency distribution of the carapace width ranged from 80mm to 140mm or more these were divided into 5 basic size groups to represent succesive moulting ages, the mean for each group being 85mm, 98mm, 112mm, 124mm and 134mm and the standard deviations of 3.3-5.6mm. Application of the 5 normal distributions described as the formula F (x)=∑aiφi (x) to the commercial catch carght in east Saghalien area in 1970 showed high comformity between observed and calculated frequencies. From the above results, it seems that a method for the estimation of age composition is available for practical use, when adequate estimates of growth in relation to moulting age can be obtained with accuracy in the future by experimental studies. Growth of the carapace width regarding moulting ages fits the logistic equation, lt=152/1+e2.31-0.399t
日本水産學會の論文