Quick Answer
To avoid bycatch when using a gill net, adjust the mesh size to the specific target species, avoid fishing in areas with high biodiversity, and use a net with a gentle slope to reduce entanglement.
Choosing the Right Mesh Size
When constructing a gill net, it is essential to choose a mesh size that is specific to the target species. For example, a mesh size of 2-3 inches (5-7.5 cm) is suitable for catching small fish like sardines, while a mesh size of 10-12 inches (25-30 cm) is better suited for larger fish like salmon. Using the right mesh size can significantly reduce bycatch, as smaller fish will not be able to fit through the larger mesh and be caught accidentally.
Fishing in Low-Biodiversity Areas
Fishing in areas with low biodiversity can also help reduce bycatch. Areas with high levels of biodiversity are more likely to have a variety of species present, increasing the chances of catching non-target species. By avoiding these areas, fishermen can minimize the risk of bycatch. For example, fishing in areas with a low concentration of vegetation or in areas with a uniform bottom type can help reduce the likelihood of catching non-target species.
Net Design and Deployment
The design and deployment of the gill net can also play a role in reducing bycatch. A net with a gentle slope can reduce the likelihood of entanglement with non-target species. Additionally, deploying the net in a way that allows it to sink slowly can also help reduce bycatch. For example, deploying the net in a way that it sinks at a rate of 1-2 feet (30-60 cm) per minute can help prevent the net from catching non-target species.
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