サケ稚魚の生態調査-VI : サケ稚魚の摂餌行動に関する-知見
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概要
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An experimental observation has been done simply to understand the relationship between feeding activity and the general behaviour in chum salmon fry during seaward migration. The result indicated that feeding activity of the fish is more active at night than in the daytime, beginning feeding activity vigorously when light intensity reduces to about 0 lux after sunset. This feeding activity of the fish seems to be restricted by light, as the movement of the fry during seaward migration is caused by darkness (KOBAYASHI1); HOAR2), 3); NEAVE5). However, the natural habit in the movement of the fish can be changed artifically by the continued supply of food in the daytime. It is highly probable that the feeding activity of chum salmon fry is not to do with the gradual change of water temperature. It was ascertained that the growth rate of the fry which were fed during the night (B Group) is greater than that of the fry fed in the daytime (A Group).
- 公益社団法人 日本水産学会の論文