源式網の漁獲性能に関する研究-2-袋網の挙動について

概要

論文の詳細を見る
Field experiments of a bottom drift-net, "Gensiki-ami", which aims mainly at "kuruma ebi" (Penaeus japonicus), were made with a 1/2 scale net and the full scale net. The physical observations and records by underwater photography resulted in a classification of the shape of the bag behaviour near the sea bed into five types. Fishing efficiency for each type and causes of shaping are considered in this paper. In order to overcome the operational troubles of reversals of the bag-net, a polyethylene bag-net was newly made and a series of comparative experiments with a nylon net currently used by fishermen was carried out. The results revealed that specific gravity and flexibility of polyethylene fibres was more pronounced than the effect of relative speed. Thus, the polyethylene net behaves much better than the nylon net.
日本水産學會の論文