定置網の網形の変遷に伴う漁獲の変化

概要

論文の詳細を見る
The construction of the large type Set-net had been changed in several fishing grounds along the western part of Sagami Bay during 10 year from 1968 to 1977. On the main species, the daily record of catch was analysed with special reference to the construction of Set-net, operated in each fishing ground in the summer and autumn season. The results obtained here were summarized as follows: The catch of horse mackerel Trachurus japonicus, in Otoshi-Ami(Trap net) tended to be larger than that in the Ryochuso-Ami (Trap net with two mid-lager bags), while the catch of mackerel Scomber japonicus and sardine including anchovy Engraulis japonicus, round herring Etrumeus micropus, and sardine Sardinia melanosticta tended to increase. Concerning the Ryochuso-Ami, the catch of each bag (the west and the east side bag) was compared on the main species. The catch of horse mackerel in the west side bag was larger than that in east side bag, while on young yellow tail Seriola quinqueradiata, the catch was larger in the east side bag. On sardine and barracuda Sphyraena japonica, the catch was the same both in the west and the east side bag.
日本水産學會の論文