꽁치봉수망 집어등 불빛의 수중 투과특성
Transmittance Properties of Fishing Lamp in Stick-held Dip Net Fishing Vessel for Pacific Saury
1
조회
0
다운로드
2
인용
0
참고문헌
키워드
초록
꽁치봉수망 조업시 어선의 집어등에 의한 수중 환경의 변화를 밝혀 광 환경이 꽁치의 어획에 미치는 영향을 분석하기 위한 기초 단계로 수중 조도를 측정하여 꽁치가 분포하는 어획 수층의 광 환경을 분석한 결과를 요약하면 다음과 같다. 공기중에서 홍색 백열등과 할로겐등의 방사조도는 둘 다 1,052 nm의 파장에서 최대치를 보인 후 감소하는 경향을 나타내었고, 600 nm이하의 파장에서는 할로겐등이 홍색 백열등에 비해 방사조도가 약간 높게 나타났다. 공기중 조도는 좌현 선미에서 가장 높았고 선수에서 가장 낮게 나타났다. 조사해역에서의 집어등 불빛의 수중투과특성은 50m 수층에서 각각 0.3/x, 0.6/x 이하로 나타났으며 일반적인 꽁치어장의 특성을 가진 어장에서 볼 때, 꽁치가 집어되는 수층의 조도는 0.5/x 이상인 것으로 보인다.
Abstract
The transmittance properties of fishing lamp in stick-held dip net fishing vessel for Pacific saury was investigated during nighttime operations in the North Pacific on May 19 and 24 2003. The incandescent lamps of red color (750Www×521) were used as a fishing lamp for gathering Pacific saury. The relative irradiance of red incandescent lamp and halogen lamp in the air showed peak in 1,052 nm of wave length. However, the irradiance of halogen lamp below 600 nm of were length was higher than that of incandescent lamp. The relationship between underwater illuminance (Y) and water depth (X) of sunlight in the observation areas A (37°11'N, 178°46'W) and B (31°11'N, 178°01'E) is represented as follows; Y=2572.2ㆍe-0.0721X, R²=0.9915 Y=3312.4ㆍe-0.0619X, R²=0.9837 The distribution of underwater illuminance of observation areas A and B showed low value of 0.3/x and 0.5/x in 50 m depth, respectively. In the fishing grounds of Pacific saury, the light intensity of distribution depth was above 0.5/x.
참고문헌 (9)
- "Fishing efficiency of squid jigging in relation to the variation of fishing lamp power", pp.179~186 (1993)
- "Underwater irradiance distribution of fishing lights used by small-type squid jigging boat", 62, pp.420~427 (1996)
- "Relationship between the boat sizes, light source output for fishing lamps and the catch of squid, Todarodes pacificus Steenstrup, in coastal squid jigging fishery of Japan.", 35(6), pp.644~653 (2002)
- "Relationship between the catch of squid, Todarodes pacificus Steenstrup, according to the jigging depth of hooks and underwater illumination in squid jigging boat", 34(6), pp.624~631 (2001)
- "Underwater illuminance of line light source model for fishing lamps of coastal squid jigging boats. Nippon Suisan Gakkaishi, 69(1), 44-51 (in Japanese).", 69(1), pp.44~51 (2003)
- "Transmittance characteristics of fishing light according to the optical water type in the squid jigging ground of the Sea of Japan.", 64,, pp.650~657 (1998)
- "Horizontal illuminance of line source model for fishing lamps around the coastal squid jigging boats", 63(2), pp.160~165 (1997)
- "A study on the vertical distribution of common squid in the eastern waters of Korea", pp.23~28 (1985)
- "Ecological properties of Pacific saury school in relation to the photo-behaviour and the catchability", pp.457~468 (1988), Tokyo Univ