魚群探知機による定置網漁場における魚道の測量の一つの試み(予報)

概要

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It is important for improving the catching efficiency of set net to detect the swimming course of fish schools in fishing areas. For this purpose the experiments were carried out at Yoshihama Bay, Iwate Prefecture during November to December, 1954 (Table 1). Two survey boats, each installed with a vertical type of fish finder, sailed back and forth along the detecting course selected as shown in Fig. 1. A number of points where we encountered with fish schools, were plotted on a chart to calculate the encounter index. The swimming course of fish schools was estimated as follows. The fish schools which enterd the northern part of the bay, at a speed of 0.5-2m/sec (Tables 3 and 4), swam to the south along the isobath of 40-60 meters and reached at the front of the set net. According to our observation they were expected to fall into the set net on their way of going out the bay (Figs. 3 and 4). Further studies are under way to obtain better results by using simultaneously a vertical type and a horizontal type of fish finder.
公益社団法人日本水産学会の論文