Underwater irradiance and optimal allocation of 2 k W straight type fish aggregation lamps

QIAN Weiguo;YE Chao;WANG Weijie;LU Kexiang;National Engineering Research Center for Oceanic Fisheries; Key Lab. of Sustainable Exploitation of Oceanic Fisheries Resources,Ministry of Education; Collaborative Innovation Center for Distant-water Fisheries;College of Marine Sciences,Shanghai Ocean University;

straight type fish aggregation lamps;;underwater irradiance;;reasonable allocation;;squid jigging vessel

Based on the actual measurement of 2 k W straight type fish aggregation lamps,we calculated the underwater illumination distribution of the squid jigging vessel Xinshiji No. 52. The results show that when the total power was 360 k W,the iso-illuminance curve contours of 10. 000 lx were at the depth of 32 m; in horizontal direction,it reached 80 m. The curve contours of 0. 100 lx were at 50 m vertically and 260 m horizontally. When the total power was 180 k W,the curve contours reduced about 5 m in depth. Regarding 0. 010 lx as the lowest limit to attract squid,if the power was increased from 180 k W to 360 k W,attracting distance could be increased from 620 m to 750 m,and 21. 1% of effective attracting distance increased horizontally. If the lamps' height increased for 0. 5m,12. 0% of the effective water volume increased. If the lamps' space increased for 0. 05 m,4. 4% of the effective water volume increased.