振縄(桂縄)の駆集効果に就いて
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概要
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In the Inland sea of Japan it has been the practice of catching Pagrosomus major (T. &S.) to use Sibariami (a type of purse seine). In this method of fishing, the fishes are first driven by means of Furinawa into a pack which is then enclosed with the fishing-net so as to be readily landed. (Fig. 1) In the present work some model experiments were carried out so that the influence of Furinawa exerted on the behavior of fishes might be analysed. The scheme of model Furinawa here used is given in Fig. 3. The model fishes were ordinary carps, Cyprinus carpio LINEE. The experiments were performed in a water tank as shown in Fig. 2. Experiment 1. It was investigated the effects of rise and fall of illumination brought on the rate of fish-gathering. Experiment 2. It was examined the relation between the towing-speed of Furinawa and the rate of fish-gathering. Experiment 3. It was inquired into the bearing of number of Furiki attached to Furinawa upon the rate of fish-gathering. The results are shown in table 1-11. On the basis of these data it may well be said that: 1. The rate of fish-gathering remains 0% when Furinawa used without any Furiki. 2. Treating the data statistically for the rate of fish-gathering in correlation to the strength of illumination, a value for the correlation coefficient is calculated as r=+0.5, in an illumination range of 10-150 Lux. In this range the rate attains to 91-96%. In an illumination range of 0-10 Lux, r=+1 while the gathering-rate effected by Furinawa remains only about 40%, thus, the efficiency of Furinawa depends upon the illumination, which has in turn to be of a sufficient Lux for the fishes to see Furiki. 3. The rate of fish-gathering under the influence of Furinawa varies with the towing-speed of the latter. Namely, the variation of the rate changes with the inclination of Furiki, which is in turn determined by the towing-speed. 4. As Furiki increases in number also increases the rate of fish-gathering.
- 公益社団法人 日本水産学会の論文
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