落し網の網型と敷設水深のちがいが漁獲に及ぼす影響

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概要

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• In the present studies, the catch of a trap net composed of inshore and offshore nets was analyzed to know the effects of the depth at which they were placed, and the type of them (as shown in Fig. 2) on the catch, from the data of the ratio of catching fish (indicated by the ratio of total numbers of hauling net to the numbers of hauling net with fish) and the catch per hauling with fish at the periods of 1958, 1960 and 1961, which were obtained from the diaries of the trap net at Hisanohama fishing ground in Fukushima Prefecture. The results obtained are as follows: 1) On yellow tail, Seriola quinqueradiata, the ratio of catching fish is almost equal between the inshore and offshore nets at the periods when the both are constructed with the same type of ordinary or mid-water nets (1958 and 1961). The catch per hauling with fish shows, however, a higher value in the offshore net. In comparison between mid-water type trap nets (1960), the ratio of catching fish is higher in the former, while the catch per hauling with fish is higher in the latter. 2) On red sea bream, Chrysophrys major, the inshore net superiors in the ratio of catching fish and in the catch per hauling with fish to the offshore net at the period when the both are formed with ordinary type (1958). When the both are mid-water type (1961), there are no difference in the above items. Considering on the offshore net, the mid-water type is better than the ordinary one from the viewpoint of the ratio of catching fish (1960).

著者

• 竹内 正一

  東京水産大学

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• まぐろ延縄の漁獲からみたインド洋のメバチの適水温
• 神奈川県三浦地区定置網漁場の漁獲特性に関する統計的研究
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• 西部太平洋海域におけるかつお・まぐろまき網漁業の漁獲変動
• 日本漁業はどうなる
• 相模湾における漁業と海域利用の将来展望
• 落し網の網型と敷設水深のちがいが漁獲に及ぼす影響
• 大西洋におけるメバチの漁獲分布
• 大西洋メバチ漁獲量デ-タベ-スの作成とその応用
• 伊豆諸島海域におけるカツオ漁獲動向の季節変化〔英文〕

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