山口県日本海沿岸域のウルメイワシ棒受網漁業のハロゲン水中集魚灯とLED水中集魚灯の配光特性

Underwater photon distribution for fishing lights（halogen and LED）used for round herring, Etrumeus teres, stick-held dip net fishing along Yamaguchi Prefecture in the Japan Sea

Creators Kajikawa Yoritake

Creators ITO Takafumi

Creators MOHRI Masahiko

Creators WATANABE Toshiteru

The spectral photon distributions in sea water from a 3kW halogen fishing lamp and a 2kW LED fishing lamps were investigated in Senzaki Bay, Yamaguchi Prefecture on 7 Dec 2009. Photon intensity in the from 450 to 710nm wavelength range was 250-350 μmol at a depth of 4m located 5m away in the lateral direction from the halogen lamp, and this was the highest intensity at this sampling point. Photon intensities at depths of 0-4m and within 10m from the lamp were similar at the 450nm wavelength (7-10μmol) and the 540nm wavelength (20-40μmol. For the LED lamp (output 100%), photon intensity was 380μmol at the 450nm wavelength and 1500μmol at the 540nm wavelength at a depth of 4m and a distance of 5m in the lateral direction. Photon intensity was 9-10μmol at the 450nm wavelength and 90-100μmol at the 540nm wavelength at a depth of 0-4m and over a distance of 10m in a lateral direction. These results show that the spectrum characteristics and intensity of LED lamps are better suited for attracting round herring than halogen lamps, suggesting that LED lamps are more efficient for use in stick-held dip net fishing with lights.

[ISSN]0370-9361