At present, most of the auxiliary light fixtures equipped with light trapping fishing boats are still traditional metal halide lamps. Fisheries companies and individuals are not willing to take the risk of using LED fishing lights. One of the reasons for this situation is that the LED fishing lamp itself is expensive, and on the other hand, the most important reason is that the fishery enterprises and individuals do not understand the actual effect and effect of the LED fishing lamp site. Production has a negative impact.
The effects of the luminaire include the brightness of the light, the depth of the light, and whether it affects the catch and fuel. Many scholars at home and abroad have researched and developed LED fishlights. MATSUSHITA et al. proposed to save fuel by mixing LED fishing lights and traditional metal halide lamps with Japanese offshore fishing vessels. YAMASHITA has verified the fishing effect of the way LEDs are mixed with metal halide lamps. Domestic scholars pay more attention to the study of the distribution of light and light field. The fishing boat is integrated as a point light source, and a reasonable arrangement scheme for single-ship and multi-ship fish-fishing lights is proposed. At the same time, some scholars have carried out many theoretical studies and proposed different theoretical calculation models and simulations.
In order to clarify whether the LED has the effect of collecting fish, whether it has a negative impact on the yield, the penetration of light in seawater, and the spectral distribution in the water, we conducted a real ship test and analysis of the LED fish lamp to provide a fishery. Practitioners and related researchers provide reference.
First, materials and methods
1.1 LED fish light
At present, domestic LED fishing lights are mostly straight-type lamps. All the wicks are arranged in the same plane. If the secondary development is not carried out, the optical characteristics such as the light distribution curve of the lamps cannot be changed after leaving the factory. This project uses a new type of 300W three-row LED water fishing lamp, as shown in Figure 1 (a), which was developed by Shanghai Ocean University and Shanghai Jiabao Xie Li Electronics Co., Ltd.
The LED fish lamp and the traditional metal halide lamp are shown in Figure 2. As can be seen from the figure, the intensity of the LED fish lamp in the 380 ~ 400 nm band is significantly lower than that of the metal halide lamp. It will cause the skin of the fishing workers to precipitate melanin, which will make the skin black and aging and damage. The energy value of each band is integrated, and the sum of the relative values ​​of the energy of the LED fish lamp is 285, and the relative value of the metal halide lamp is 1 300, although the relative value of the metal halide lamp is 4. 5 of the LED fish lamp. Double, but the consumption of metal halide lamps is 6.6 times that of LED fishlights. It can be seen that the luminous efficiency of LED fishlights is significantly higher than that of traditional metal halide lamps.
1.2 Experimental ship parameters
The parameters of the experimental fishing vessel “Ningtai 61†are as follows: total length 51.80 m, width 8.0 m, depth 4.00 m; total tonnage 490 t, capacity 140 t; main engine power 882 kW, auxiliary machine power 250 kW × 2 units 150 kW × 1 set, 25 kW × 1 set, quick freezing capacity 11 t / d; metal halide lamp 100 × 2 kW, LED fish light 100 × 300 W. See Figure 3 for the arrangement of the fish light. The 2 kW metal halide lamp is 2.9 to 3.0 m from the upper deck and 5.5 m from the lower deck; the lamp spacing is 0.58 m; the LED fishing lamp is 3.7 m from the upper deck and 6.3 m from the lower deck; The spacing is 0.1m. As a control group, “Ningtai 62†is only equipped with a 2 kW metal halide fish lamp, and is not equipped with an LED fish lamp. The other parameters are the same.
1.3 Test data
From June to July 2014, the ship “Ningtai 61†carried out field test illumination, spectral distribution, catch (yield) and energy consumption. The test sea area was 80°09'W -80°59'W, 15°05'S. - 15°50'S; as a control experiment, the fishing area of ​​the ship "Ningtai 62" is 80°09'W - 80°59'W, 15°03'S - 15°55'S.
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