Anti-submergence concealed tuna seine ecological type artificial fish gathering device

Abstract

The invention provides an anti-submergence concealed tuna seine ecological type artificial fish gathering device. The artificial fish gathering device comprises a hard framework raft body, a pluralityof floats, a locating buoy, a sinker and a self-buoyant device, wherein palm leaves are arranged on at least one degradable rope, connected with the hard framework raft body, of the sinker; and the self-buoyant device is fixed onto the hard framework raft body and is provided with a water inlet pipe, a gas generator and a gasbag, an agent and a liquid level sensor are arranged in the gas generator, one end of the gas generator is connected with seawater through the water inlet pipe, the other end of the gas generator is connected with the gasbag through a non-return valve, a pneumatic diaphragm and an electromagnetic valve are arranged in the internal cavity of the water inlet pipe, and the electromagnetic valve is connected with the liquid level sensor. According to the artificial fish gathering device, a valve body part is suspended in water, the concealment performance of FADs is improved, and thus, an anti-theft effect is achieved; and the self-buoyant device is bound to the uppersurface of the raft body and is used for providing reserved buoyancy for the raft body and preventing the FADs from submerging, so that the risk of destroying marine habitats is lowered.

Description

technical field [0001] The invention relates to seawater fishing, in particular to an anti-sinking concealed tuna purse seine ecological artificial fish collecting device. Background technique [0002] Fishermen put artificial fish aggregation devices (Fish Aggregation Devices, FADs) in the sea, and the fishing of pelagic fish can be traced back to the early 1960s. FADs were not used in tropical tuna purse seine operations until the 1980s. Since the mid-1990s, it has been widely used in ocean waters around the world. Its structure is composed of the raft body of the water meter, the underwater suspension (UHS) and the positioning buoy 3. Made of rafts and floats. In the past 30 years, the drift FAD fishing method has developed rapidly, and this operation method has gradually occupied a dominant position in tuna seine fishing. The emergence of FADs has improved the fishing capacity and fishing output of tropical tuna seine fishing vessels, and is welcomed by fishermen. It ...

AI Technical Summary

Problems solved by technology

After release, it is very easy to be discovered, salvaged, stolen or destroyed by other fishing boats, resulting in increased operating costs

As time goes by, the structure of FADs becomes loose, and the floats are easily lost and damaged, and cannot provide buoyancy, causing FADs to sink to the bottom of the sea, causing damage to coral reefs from time to time

In addition, the mesh used in the production of FADs is difficult to degrade and strong, and may be swallowed by marine organisms after sinking

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