open access

https://hdl.handle.net/2115/72391

Fish attracting effects of LED light of different colours

英語

wavelength

2017-10

Contributions on the Theory of Fishing Gears and Related Marine Systems

10

235-240

There are many fisheries that use artificial lights to attract fish, such as the squid-jigging and seine net fisheries. There are also fisheries that use lights to prevent bycatch. Relationships between the characteristics of light used to attract fish and the behaviours of fish to those lights have been investigated, but most of those experiments occurred in indoor water tanks under controlled conditions. The aim of this study was to investigate the effect of using LED lights of different colours (wavelengths) to attract fish in a natural (nearshore, coastal) environment. The experiment was conducted at an underwater observation window on the coast of Mombetsu in Hokkaido, Japan. LED lights were positioned on the inside of the window and the number of fish that appeared at the window during the night (from evening to morning) was recorded at 5-min intervals using a video camera. The colour of the light (red, 633 nm; green, 514 nm; cyan, 490 nm; blue, 465 nm) was changed every day for about one week. White-edged rockfish (Sebastes taczanowakii), threestripe rockfish (Sebastes trivittus Hilgendorf) and black rockfish (Sebastes schlegelii Hilgendorf) were the most common species observed during the experiment. Among these species, white-edged rockfish was most commonly observed. Blue light (465 nm) attracted the most fish, while red light (633 nm) attracted the fewest. The relationship between the wavelength and the number of fish was inversely proportional to one another.

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Accepted Manuscript