According to a recent estimate, most of the turtles caught inadvertently died while capturing tuna, shrimp, squid and other marine life. Researchers believe that accidental capture is the leading cause of death in turtles.
In view of the fact that complete bans on fisheries can seriously jeopardize local economic development, natural resource conservationists have turned to find ways to warn turtles to stay away from fishing nets. Studies have shown that sea turtles can perceive light, even ultraviolet light, throughout the visible spectrum; while many fish have a significant decrease in visual acuity before the ultraviolet range. John Wang, a fishery researcher at the University of Hawaii at Manoa, says: This means we can selectively communicate with sea turtles in the ultraviolet range while avoiding other fish.
Wang and his colleagues teamed up with fishermen in Baja California Sur, Mexico to experiment with reusable, battery-powered UV LEDs in an attempt to deter turtles. They placed an ultraviolet lamp every five meters on the fisherman's thorn net, which reduced the accidental capture or accidental catching of the turtle. Although the lighting network also captures fewer fish, the researchers believe that there is no significant difference in economic value. The team recently published its findings in the Biology Letters.
According to Wang, fishermen were initially reluctant to participate in the study, but they quickly realized that we were not saving turtles at the expense of fisheries. In the long run, this technology will benefit the fishermen. Hoyt Peckham, a visiting scholar at the Stanford University Marine Research Center, said: Turtles are sharp and have a lot of destructive power, so fishermen in some localities or communities have strong incentives to implement programs that reduce sea turtles. Wang added that if possible, when fishermen are capturing fish with commercial needs, they can use LEDs to emit different wavelengths of light to scare away turtles. He plans to conduct experiments in Mexico, Brazil and Indonesia next year.
Marine Electro-hydraulic Windlass
The windlass is installed on the main deck of the ship's bow, which is used for the ship to lift the anchor and drop the mooring cable.
Windlass can be divided into manual, electric, hydraulic, pneumatic, etc. according to the driving form.
The windlass can be divided into several specifications such as φ12--φ120mm according to the diameter of the anchor chain.
Windlass can be divided into single-sided and double-sided according to the distribution of drums.
The windlass is mainly composed of base, bracket, chain wheel, brake, chain wheel, gearbox, electric control system (except manual windlass), etc. Electric windlasses have electric motors, and hydraulic windlasses have hydraulic pump stations.
The main technical indicators of the windlass include the diameter of the anchor chain, the nominal speed of the anchor, the rated load, the supporting load, several levels of speed change, electrical system, etc. The installation of the windlass on the ship should ensure that the wrap angle between the anchor chain and the sprocket is 117-120°.
Electric windlass
The electric motor directly drives the windlass, and the drive shaft is driven by the gear box to work, and the structure is simple; it is generally suitable for windlasses with an anchor chain diameter of 16mm-93mm.
hydraulic windlass
It is suitable for windlass with anchor chain diameter of 16mm-120mm. Hydraulic windlasses are also called electro-hydraulic windlasses. It drives the oil pump with a motor, drives the motor with high-pressure oil, and then drives the transmission gear through a reducer (or no reducer). To make the windlass run, its structure is relatively compact and its volume is small. Now there has been an automatic hydraulic windlass, which is equipped with an anchor chain length sensor. When the anchor chain needs to be thrown out, the windlass will automatically stop; , can automatically decelerate; the anchor will automatically stop when it enters the anchor chain drum and is properly received.
Marine Electro-Hydraulic Windlass,Windlass Anchor,Electric Windlass,Manual Windlass
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