太平洋北西部に於けるメカジキの漁況と体長の周年変化及び分布と〓游について
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Changes noticeable in a whole year in the fishing condition (rate-of-catch) and the bodylength formation (body-length frequency) of swordfish, Xiphias gladius, inhabiting in the northwestern part of the Pacific Ocean. The author has made a study by means of summarizing by month the rate-of-catch (the fishing condition) and the body-length frequency (the bodylength formation) have been determined by Kanagawa Prefectural Fisheries Experimental Station for each month for series of years with no regard to any particular year so as to minimize errors happening due to comparative scarcity of data. In so doing, also, he has avoided inclusion of data obtained from other sources than longline in order to eliminate any error arising from use of any differect type of fishing gear. From the study with such precautions the following presumptions have been obtained: 1) The area where swordfish live chiefly in the northwestern part of the Pacific Ocean is defined by Lat. 20°-45°N, Long. 140°-180°E. 2) Fishing condition of this species in a whole year in each of the sub-area within the zone above-mentioned changes in such a manner as is shown in Figs. 4 and 5. 3) The mean body-length of the species in each of the sub-area exhibits such a change as is shown in Figs. 4 and 5 while the body-length formation displays such a change as is shown in Figs. 7 and 8. 4) Swordfish in the area are generally distributed and migrate in such a manner as is shown in Fig. 6. 5) Swordfish in the area may be divided into 4 body-length groups and fish of each group are distributed and migrate in such a manner as is shown in Fig. 9, A-D. 6) High rate-of-catch of this species in sub-areas A-E and G is brought by migration of medium-, and large-sized, fish groups. High fishing rate of this species occurring in January of every year in sub-areas H and I of a young fish group together with a small-sized one and that occurring in May and June in the same sub-areas of medium- and large-sized, one. 7) Recruitment of the small-sized fish group into the medium-sized one is made chiefly in the sub-area F but it also takes place in sub-areas E, H and I.
- 社団法人 日本水産学会の論文
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