水槽実験における刺網の選択性曲線のモンテカルロ・シミュレ-ションによる推定

概要

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The selectivity curve of the gillnet and the semi-trammel net was estimated by applying a skew-normal function. The parameters of the model were obtained using the Monte Carlo simulation method. The data were taken from a large outdoor water tank containing a large number of rainbow trout Oncorhyncus mykiss of known size composition. A large tank was used for the purpose of minimizing any statistical error which may be caused by smaller tanks. The he length distribution of the catch from the calculated value was in close agreement with the experimental value. Thus, the skew-normal function could well describe the selectivity curve of the gillnets. The selectivity curve of the semi-trammel net had a larger degree of skewness than that of the gillnet. However, the skewness of the semi-trammel net decreased linearly with an increase in mesh size. Thus, the entagling effect of the semi-trammel net was higher for larger fish.
日本水産學會の論文