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根据2003年10月在印度洋鸢乌贼渔场中鱿钓船周围某一断面水中光照度的实测数据和渔获生产统计数据,对金属卤化物灯和高压钠灯的光照度分布及其钓捕效果进行了比较分析。在120盏×2kW金属卤化物灯作用下,在距船舷3.0m的垂直断面,其水深5m内的光照度多在100lx以上,10lx的等光照度曲线在20m水层左右,0.01lx的等光照度曲线在55m水层附近。但在20盏×500W高压钠灯作用下,在距船舷3.0m的垂直断面,其海面的平均光照度为3lx左右,0.01lx的等光照度曲线在20m水层附近。以一些头足类的适宜光照度(0.01～10lx)为例,其在该照度范围内的水体体积仅为120盏×2kW金属卤化物灯作用下的1/5左右。这说明采用高压钠灯可以使鱿鱼聚集密度增大,钓捕深度变浅,从而提高渔获效率,且其平均产量比采用高压钠灯前高1～3倍。另外,研究表明大型专业鱿钓船钓捕鸢乌贼时的最适集鱼灯功率为112～160kW,鸢乌贼的最适光照度为0.01lx左右。
According to the measured data and catch production statistics of water in a section of squid fishing boat in the fishing ground of Symplectic or Syngenea ochrocephalus in October 2003, the illumination distribution of the metal halide lamp and the HPS lamp were comparatively analyzed . Under the effect of 120 × 2kW metal halide lamps, the illumination intensity within 5m of water depth is more than 100lx at a vertical section of 3.0m from the ship’s rail. The equal illumination curve of 10lx is about 20m of water layer. The equal illumination of 0.01lx is between 55m near the water layer. However, under the effect of 20 × 500W high-pressure sodium lamps, the average illuminance at the sea surface is about 3lx at a vertical section of 3.0m from the ship’s rail side, and the isoptic curve at 0.01lx is near the 20m water layer. Taking the suitable illumination of some cephalopods (0.01-10 lx) as an example, the volume of water in the illumination range is only about 1/5 under the action of 120 x 2 kW metal halide lamps. This shows that the use of high-pressure sodium lamp can increase the density of squid accumulation, fishing catch shallow depth, thereby enhancing the efficiency of the catch, and its average yield than before the high-pressure sodium lamp 1 to 3 times higher. In addition, the study shows that the optimum fishing light power of large-scale professional squid fishing catch fishing kite squid is 112 ~ 160kW, the optimum illuminance of Symplectoteuthis oualaniensis is about 0.01lx.