White LED helps to greatly enhance the capture rate of snow crab in Canada

On 2013, Newfoundland and Labrador area is located in the eastern Canadian snow crab fisheries will be the 200th MSC certified sustainable fishery.

Like all fisheries, the capture rate of snow crabs in Canada is crucial to the fishermen, although it is often difficult to achieve the goal.

In the fourth session of the International Conference on marine protected areas, marine and Fisheries Institute of Newfoundland University doctoral candidate Khanh Nguyen proposed a method to enhance Canada snow crab capture rate and no additional cost of transformation and so on appliances.

Nguyen's research focuses on the biological behavior of snow crabs in Canada, particularly those that detect light and respond to light. There are a number of known species of marine organisms will have light attraction, such as squid (SQUID JIGGING), is the use of light to attract prey. Although there are some fishing methods using relatively strong light to attract prey, Nguyen mainly studies low power, light color and more special LED lights.

The first phase of the study is the main laboratory. The main object of study for the reaction of light for the Canadian public fishing snow crab (all caught crabs must be released, Nguyen shows the place) in response to blue, green, red, purple and white 5 different color LED light snow crab. And the response behavior of snow crab was measured. Snow crabs have no apparent response to red and green light LED, 75% of the snow crabs move toward white and blue light, while up to 85% of the snow crab will avoid purple LED light.

In the second phase, the Nguyen study takes LED to the sea, where the snow crab lands. Newfoundland is fishing with Labuladuoxue crab with smaller vessels using conical mesh with bait, usually enough into water for about 24-48 hours.

In order to compare the low power LED light "unit effort capture volume (CUPE)", the researchers attached different colored LED lights on the part of the Internet, but also did not have any LED lamp installed as a control group. In the laboratory, the Canadian snow crab is not the same response to light color.

Finally, for those who want to build a high unit efforts to capture the amount of fishermen, the results are obvious, white LED lights can significantly enhance the capture rate. Compared with the control group that does not have any LED lights installed, as long as a low power white light LED lamp can reach 77% of the unit effort capture.

The use of LED light promoted Er Canada snow crab capture rate relationships on the snow crab fishery is very obvious, the snow crab fishery to enhance the capture rate, and the white LED lights to absorb than the original 1.7 fold increase in the catch.

Nguyen said: before the fishermen have to run 8-9 times in order to capture the target number of snow crabs, but now only 5 times to catch the target catch on the day. "

The operating cost is reduced, such as the cost of fuel, can directly produce snow crab fishery financial help.

The snow crab fishery in Newfoundland and Labrador bring opportunities for coastal areas in many locations, the promotion of financial capital will have representatives directly to help fishermen. The Nguyen study found that seems to Canada snow crab capture rate of benefit - as far as we know, he has received many telephone inquiries from snow crab fishermen, said in the hope of a fishing season fashion LED lamp. (compile: LEDinside editor, Zhang Yahan)

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