Twin-rig fishing is a very popular and effective fishing technique, but to be successful it is essential to keep the central wire between the two trawls close to the seabed so as to optimise fishing performance.
In the past, this was achieved through using chains to act as a weight, but nowadays a much better and more efficient option is to use a trawl clump. This heavy weight is often fitted with rollers or wheels to prevent unnecessary disturbance of the seabed and also to reduce drag.
Clumps are one of the specialisms of Morgère, the trawl door manufacturer. The company manufactures two types of clump – the ‘Compact Clump’, which has rollers, and the ‘CL Clump’ that features bobbins or wheels. The former is ideal for smaller vessels, whilst the ‘CL Clump’ is designed for use with larger boats.
According to Michel Dagorn of Morgère, a good clump is one that achieves the key aims of keeping the twin-rig trawls close to the seabed whilst at the same time keeping drag to the minimum.
“For our clumps, we have developed a design that is able to run on the seabed by exerting a hydrodynamic force that helps to reduce drag,” he says. “This fuel efficient approach is further enhanced by the wheels or rollers which play a crucial role in ensuring the clump travels over the seabed smoothly and with as little disturbance as possible.”
Another specialist design feature of Morgère clumps is the use of extra-tough Hardox steel on the parts of the equipment that comes directly into contact with the seabed, which helps ensure the clumps have a long life.
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