STUDIES ON THE FISHERIES WITH LUREING LIGHTS-III:STUDIES ON THE ANGLING FOR MACKEREL, SEA BREAM AND GRUNT

概要

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The purpose of useing the lureing light in angling fishery is that not only lureing up of fish to the shallow layer where the angler is easy operated to the angling gear from deeper sea or sea bottom but also to make baiting of fish themselves is promoted by illumination light. In this studies, two angling gear types are indicated, the one is so-called tenbin, the other is for the capture of sea bream and grunt. (as showen fig. I-3). Mackerel angling in WAKAYAMA prefecture, had been carried out by two tonnage classes fishing boat; 3-7 tons class with 1.5-1.0kw candle-power lamp and over 7 tons class with 2kw. Swimming layer of mackerel was estimated as 35-50 meters in depth in there. Illumination zone of light is varied by candle power and illumination strength of about 10 lux for optimum condition of light when fish are lured up with 1.0, 1.5 and 2kw lamps was indicated 18m, 28 and 35m in depth respectively. In Western Kyushu, sea bream and grunt are angled with hand line and then are used to lureing lamps. Fishes are lured up to about 25-30 meters from the bottom of 50 meters around by lureing light and then there are illuminated as about 10 lux. Intensity of light must be increased or decreased according to the depth of fish living layer.
社団法人日本水産学会の論文