Quick Answer
Larger mesh sizes in gill nets can significantly reduce bycatch, allowing more targeted fishing and decreasing the catch of non-target species.
The Importance of Mesh Size
Mesh size is a critical component of gill net construction, and its impact on bycatch cannot be overstated. A mesh size of 10-12 inches (25-30 cm) or larger has been shown to reduce bycatch of non-target species such as turtles, sharks, and fish by up to 50%. In contrast, smaller mesh sizes of 5-6 inches (13-15 cm) can lead to a significant increase in bycatch.
Case Studies and Techniques
Studies have demonstrated that using larger mesh sizes can be an effective way to reduce bycatch. For example, a study conducted in the Mediterranean found that gill nets with a mesh size of 11 inches (28 cm) resulted in a 70% reduction in bycatch compared to nets with a mesh size of 6 inches (15 cm). Another study in the Pacific Ocean found that using a mesh size of 12 inches (30 cm) reduced bycatch of turtles by 80%. Techniques such as using escape panels or modifying the net’s sinker line can further reduce bycatch.
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