Abstract
By a model of representative bag net of fixed fishing nets, the deformations (Θ) caused by the tidal currents (V) were studied (Fig. 5.). The results were scaled up into three kinds of actual nets (2 kinds of synthetic fiber Saran, Cremona the densities of which were ρ=1.70 and 1.24, and cotton ρ=1.39). The difference of deformation owing to the difference of the apparent density of netting cord in water has been infered (Fig. 6). The degree of recovery in deformation of the net caused by the current by adding the weighted rib lines has also been studied (Fig. 7 and 8).
