サザエ刺網(在来型と改良型)の漁獲性能の比較〔英文〕

概要

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Fishing experiments were conducted using topshell trammel nets and bottom fish tramme nets as a control in the west of Yamaguchi Prefecture form October 1990 to June 1991. The topshell trammel nets were grouped into two types, one being the ordinary type and the other a pilot type proposed for test purposes. The latter, as compared with the former, is smaller in the height of the net and thus plays, in effect, a role in reducing fishing mortality caused by lost gear, even if the gear escapes during fishing operation, because it has the least possible amonut of netting. This kind of fishing mortality is called ghost fishing. Each of the two types was grouped into three subtypes by the mesh size of the inner net. Of a total of 391 topshells Turbo cornutus, 139 were caught by the ordinary type, 169 by the pilot type and 84 by the control nets. The mean CPUE, the catch per unit of net per average of soaking hours, was used in a statistical comparison between the catching power of the ordinary type and that of the pilot type. As a result, the topshell cathing power of these two types were nearly equal.
日本水産學會の論文