Journal of Marine Sciences ›› 2013, Vol. 31 ›› Issue (1): 85-90.

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The theoretical calculations of underwater irradiance of upper water fish aggregation lamps and its optimal allocation in light purse seine vessels for chub mackerel(Scomber japonicus)

SHA Feng1,2, QIAN Wei-guo*1,2,3, WU Zhong-qi4, CHEN Xing-jun3   

  1. 1. National Engineering Research Center for Oceanic Fisheries, Shanghai Ocean University, Shanghai, 201306 China;
    2. College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China;
    3. Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education,Shanghai Ocean University, Shanghai 201306, China;
    4. Ningbo University, Ningbo 315211, China
  • Received:2012-06-11 Revised:2012-12-31 Online:2013-03-15 Published:2022-11-29

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Abstract: According to the arrangement parameters of attracting lamps on the light purse seine vessels, the illumination distribution underwater was calculated. The results showed that in the case of the total power of fishing lamps being 180 kW in main light vessel, the equal illumination curve of 10 lx could reach 56 m in horizontal direction in the farthest, and did not exceed 20 m in vertical direction. In 40 m vertical and 40 m horizontal distance from the ship, the illumination was about 0.01 lx. In the second case of the total power of fishing lamps being 120 kW in vice light vessel, the equal illumination curve of 10 lx could reach 46 m in the horizontal farthest,and did not exceed 20 m in vertical direction. In 40 m vertical and 33 m horizontal distance from the ship, the illumination was about 0.01 lx. In the third case of the total power of fishing lamps being 40 kW in net vessel, the equal illumination curve of 10 lx could reach 45 m in the horizontal farthest, and did not exceed 15 m in vertical directiong. In 35 m water depth and 38 m horizontal distance from the ship, the illumination was about 0.01 lx. As to the configuration of fish lamp, the present current configuration of main light vessel is good, but if we increase the space to 0.26 m, and increase the lamps' height to 5 m, 1.6% of the effective water volume can be increased. The present current configuration of vice light vessel is good, but if we decrease the space between to 0.28 m, and increase the lamps' height to 5 m, 2.1% of the effective water volume can be increased. And the present current configuration of the net vessel is also good, but if we decrease the space to 0.64 m, and increase the lamps' height to 9 m, 1.7% of the effective water volume can be increased. The results also show that it is not very effective way to improve the light induced range of the boat by greatly increasing the total power of fishing lamps.

Key words: light purse seine, underwater irradiance, fish aggregation lamp, fishing vessels, Scomber japonicns

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