漁期,海域におけるサケ・マスの空間分布の特徴について

概要

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In the previous paper, some information about the characteristics of the spatial distribution of the school of salmon was given by the correlograms and power spectra for the catch per unit net. In this paper, through the use of the above mentioned method, based on the experimental data of 1965 in the North Pacific Ocean, the calculations of correlogram and power spectra were performed. The properties of this paper are indicated as follows; 1) The drift gill net used in these experiments consists of the simplified arrangement of amilan multifilament nets. 2) The data were analysed for chum and pink salmon separately. 3) The power spectra were calculated for each correlogram and not for the average of correlograms as in the previous paper. 4) For smoothing of the power spectra, the spectral window by AKAIKE was used. According to the above analysis, the following conclusions are drawn. Schools of pink and chum salmon have almost the same properties in their spatial distribution. Considering the results of calculations, it is recognized that there is the following tendency in the type of power spectrum. That is: at the beginning of fishing season the short periodic component is remarkable and as the season goes on the medium periodic component becomes noticeable too.
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