| 摘要 |
A fish gathering method and a fish gathering system using the radiation of the light are provided to induce the shoal of fish by diversifying an incidence angle of the light. A fish gathering method is constituted as follows. The light having directivity is irradiated from the light source(1) to the water surface and makes the fishes gathered. The deep incident field in which the incident depth of the light becomes deeper is formed in the place which is further than the shoal of fish. The deep incident field is moved in the light source direction and the shoal of fish is induced in the light source direction. The induced shoal of fish is confirmed by the ultrasonic wave oscillating. The reduction speed of the speed of the movement of the deep incident field or the incident bathymetrical distribution is adjusted. |
