What does light have to do with fishing?
It turns out that many Marine creatures have an instinctive phototaxis.
For example, when a crab sees a light source, it crawls over it slowly.
Also, some fish are concentrated in light sources.
In addition to the phototaxis that some fish have, there's another reason, according to the analysis, which may be that a large number of plankton and small fish are concentrated near the light source, and the fish swim there to find food.
Using this characteristic of fish, light fishing has gradually become an important means of fishing.
In fact, using light to trap fish can be said to be an old and advanced technology.
Say it is old, as early as in ancient and modern secret garden, once recorded the story of our fishermen fishing with fluorescence.
The fishermen loaded hundreds of the fireflies inside the casing and submerged them in the water to lure light-loving fish and shrimps to the inside of the casing before rinsing them out.
Say it is advanced, the method that USES lamplight to catch fish is more diversiform at present, its harvest also is multiplied, be like "luminescent bacterium", the extensive application such as self-control lamps and lanterns, brought more real benefit to fishery production.
Journalists have followed the fishing boat to the lighting fishing scene: the sound of fishing boats has drowned out the sound of the waves, leaving only the "stars" dotted with the sea.
There was a thick bulb on top of the fishing wheel cab.
Dozens of 1000W bulbs need to be fully lit for more than an hour to attract fish to the fishing boats.
And then you turn off the lights, and you cast a net and you cast a net, and that's called the light Seine.
"The effect of light fishing is very good, because it consumes too much electricity and the fuel is too expensive."
Lao huang, a fisherman, told reporters that the ship's electricity was largely powered by diesel.
In recent years, as the fishery resources are declining and the number of fishing boats is increasing, competition is increasing. In order to catch more fish, fishermen have installed more and more power bulbs on the boats, which have developed from a few kilowatts a few years ago to several hundred kilowatts now.
The higher the power, the greater the power consumption. According to a statistical report, the diesel generators of fishing boats generally run at 231 ~ 272g of fuel per kilowatt.
At present, the energy consumption of fishing lamps has accounted for more than 50% of the total energy consumption of fishing boats, and there is a tendency to increase further.
Leds replace light sources
At present, China's light-induced fishery is developing rapidly. These fishing boats use traditional golden halide fish lamps (hereinafter referred to as "golden halide lamps"), which consume a large amount of oil and have low light energy utilization.
In recent years, rising fuel prices as a result of growing energy shortages have led to more and more traditional light-trapping boats that cannot make ends meet.
Moreover, once the golden halide lamp is extinguished, it needs to be cooled for several minutes or even dozens of minutes before it can be turned on again, which greatly affects the efficiency of the light-induced operation.
Some fish, such as autumn swordfish in fishing, need to adjust the lighting, several instant start and extinguish, to achieve the effect of attracting fish and improving net production.
After the golden halide lamp goes out, the drawback of lighting the lamp again is to wait for its lamp body to cool sufficiently, which seriously hinders the trap of autumn knife fish.
On the other hand, because the metal halide lamp is a kind of full-spectrum light source, besides visible light, there are also a lot of components of ultraviolet ray and infrared ray.
Uv and infrared rays do not induce fish, but can cause harm to the human body, working in the light for a long time will burn the skin and eyes, easy to induce skin cancer and cataracts.
With the increase of the power of the metal halide lamp, the degree of this injury also increases greatly.
It can be seen that the search for a new alternative light source of fishing lights has become a necessity for fishery development.
In this case, the energy-saving nature of LED makes it stand out in the market of fish lamps.
As the fourth-generation lighting lamp, LED lamp, compared with the traditional metal halide lamp, has the characteristics of energy-saving, environmental protection, high efficiency and controllable light color, which can greatly reduce the consumption of fuel and improve economic benefits while ensuring the production, and also plays a certain role in reducing the light damage to the crew.
It is reported that as a light source for fishing boats, high-power LED lamps have been widely studied in Japan and other countries. In recent years, domestic research and experiments have been carried out in this field, and breakthroughs have been made.
From the current trial, the fuel consumption is only one third of that of traditional fishing boats, but the fishing rate is better than that of traditional fishing boats.
Adjust the light, high power into the key
At present, in the research and development of LED fishing lights, Japan and other countries have already been ahead of us. To open this market, we need to make our own features.
Starting from spectral regulation and combining with the habits of various fishes, we find out the "favorite" spectrum of fishes.
The production practice shows that the primary factor influencing the effect of light attracting fish is the light source, which includes the intensity of light source, the color of light source, the configuration of lamps and lanterns and so on.
For example, under the condition of dark adaptation, adult fish have the highest phototaxis to blue and green light and the lowest phototaxis to red light.
Under the conditions of dark adaptation and light adaptation, mackerel mackerel had the maximum phototaxis for ultraviolet and red light.
"Dimming" is the strength of leds.
LED color rich, bright, can have a variety of color selection and lighting.
"However, the optimal spectrum color of the LED fishing lamp has not been determined, which requires an interdisciplinary combination to study not only the characteristics of the lamp, but also the different reactions of various fish to light color and light intensity.
At present, LED fish lamps are mostly white, some are green, but there is no definite conclusion as to what color is best for attracting fish.