Model Experiments on Sea Fixed Nets for Fishing Amber-fish, Seriola

VI. Fishing Gear in Relation to the Current Prevailing on the Fishing Ground

Abstract

Percentage frequency distribution of the current velocities observed at several fishing ground was shown in Fig 1, in which the shaded parts represent the percentage of the cases where the net could not be hauled. Fig. 2 shows the relation between the median Mi of the current velocity and the current velocity, c.v., above which the shaded part in Fig. 1. exceeds half the height of the frequency curve. In Fig. 2, the numbers attached to the marks give the ratio of the shaded to the total area under the frequency curves in Fig. 1. The said ratio is the greater, the greater the median Mi, for a certain value of c. v., while the same is the smaller, the greater the value of c. v., if Mi is nearly the same.