What’s Color Fishing Light For Squid

Types of Fishing Lamps for Squid Considering the fishing lamps currently used in the squid fishing industry , their types can be classified as follows:

1. Based on the principle of luminescence, there are mainly thermal radiation electric light sources (such as incandescent lamps, halogen tungsten lamps) and gas discharge electric light sources (such as mercury lamps, sodium lamps, metal halogen tungsten lamps).
2. Based on the light system, there are mainly above-water fishing lamps (commonly known as fishing lamps), underwater fishing lamps (commonly known as underwater lamps), and color-changing lamps (usually incandescent lamps or high-pressure sodium lamps).
3. Based on the power of the light, there are mainly 1 kW, 2 kW, 3 kW, 4 kW (basic parameters of 13 kW fishing lamps are the most commonly used in the current squid fishing industry.But now,more and more fishermen want to save the power energy,os they decided to use Led Fishing Light 1000w or 1200W Cyan and Yellow color  mixture for replacement.
4. Based on the shape of the fishing lamp, there are mainly spherical fishing lamps and tubular fishing lamps. Currently, spherical fishing lamps are more commonly used, but tubular fishing lamps are gradually replacing them.
5. Based on the color of the light, there are mainly white light fishing lamps, blue light fishing lamps, and green light fishing lamps. Green and blue fishing lamps are only used on some domestic boats, while most squid fishing boats use white light fishing lamps. Currently, for newly equipped squid fishing lamp systems, except for a few cases where the light intensity needs to be adjusted and incandescent lamps are still used, almost all adopt metal halide lamps. 

 Spectral Distribution of Fishing Lamps for Squid Currently, for newly equipped squid fishing lamp systems, except for a few cases where the light intensity needs to be adjusted and incandescent lamps are still used, almost all adopt metal halide lamps [16]. Figure 4 shows the spectral distribution curves of 4 types of domestically produced fishing lamps with different powers (1 kW, 2 kW, 3 kW, 4 kW). It can be clearly seen from Figure 4 that the luminous intensity in various directions varies with the power and type of fishing lamp. As the power increases, its luminous intensity also increases correspondingly. Using polar coordinate equations, the luminous intensity of the 4 types of fishing lamps was fitted separately to obtain their respective spectral distribution polar coordinates.

Selection of Squid Fishing Attracting Lamps Based on the comparisons and analyses mentioned above, it is evident that most current squid fishing operations predominantly use Metal Halide Lamps (MHL), with the 2 kW and 3 kW types being the mainstream. Considering the scale of fishing vessels that cater to both saury and squid fishing and their fish attracting efficiency, and referencing the lamp selection schemes of large professional squid fishing vessels domestically, the 3 kW white light MHL is chosen for this saury and squid combined fishing vessel. Upon investigation, the market price of the domestically produced MHL-3000TT type MHL fish attracting lamp is 2920 yuan (including 1180 yuan for one bulb, 1740 yuan for one rectifier, one rectifier per lamp). The Japanese USHIO produced MHL-3000TM-C fishing lamp sells for 2980 yuan (including 1380 yuan for one bulb, 3200 yuan for one rectifier, one rectifier can be paired with two lamps). Practical usage experience of these lamps on fishing vessels suggests that there is no significant difference in their fish-attracting capabilities. However, considering the superior optical stability and relatively longer lifespan of the Japanese-made lamp (3500 hours for Japanese-made vs 3000 hours for domestically produced), the Japanese-made MHL-3000TM-C is chosen for squid fishing operations.

 Optimized Configuration of Squid Fishing Attracting Lamps 3.4.1. Parameters Configuration of Light Attraction Fishing Vessel and Lamps The target fishing vessel’s relevant parameters are: total length 77.5 m, moulded breadth 11.4 m, moulded depth 7.4 m; gross tonnage 1160 t, hold capacity 1145 m3; main engine power 1800 kW. On both sides of the target ship, a row of fishing lamps is installed, assuming each row consists of 80~130 lamps, with the center of the lamp situated 7.5 m above sea level. Relevant data can be found in Table 1.

 Total Power Configuration of Squid Fishing Attracting Lamps The superposition method of illuminance calculation is used to determine the light distribution of fishing lamps underwater . Based on the relevant data of the squid fishing lamp layout of the target fishing vessel “saury-squid combined fishing vessel”, theoretical calculations were performed using the independently developed “Above-water Fishing Lamp.

When the optical attenuation coefficient of seawater is 0.12 (the transparency of the North Pacific in this area is calculated as 14 m), the cross-sectional distribution of illuminance inside and outside the fish-attracting lamp in the water can be obtained. From Figure 6, it can be seen that the illuminance value within 50 m from the ship is relatively high, mostly above 50 lx. However, there is not much difference in underwater illuminance at two different total powers; the difference in depth at each illuminance curve is only about 4 m.

Considering the power equipment of the ship’s generator and the deck layout of the ship, a total power of 780 kW for the fish attracting lamp can be considered.

3.4.3. Study on Installation Parameters of Squid Fishing Attracting Lamps The installation parameters of squid fishing attracting lamps mainly include the height of the lamp and the distance between adjacent lamps. Using the aforementioned software, calculations and analyses of the effective water volume under different installation scenarios of the fishing lamps were conducted. The volumes of water bodies corresponding to different illuminances for various lamp heights and distances are presented in Table 2.

From Table 2, it can be observed that as the height of the lamp increases, the volume of water at each illuminance also increases. However, enlarging the distance between lamps does not necessarily always increase the volume of water at each illuminance. In this context, the volume of V0.1-10 is considered as an important indicator for evaluating the configuration of fish-attracting lamps. From the data, it can be deduced that it would be optimal to set the lamp height at 7.4 m with a lamp distance of 0.52 m, considering the actual structure of the fishing vessel and the stability of the lamp.