Q.49
Which of the following factors determine the mesh size required to enmesh and hold a fish in a gillnet?
- Gillnet Selectivity Principles:
- Gillnets are passive fishing gear that capture fish by snagging (behind teeth/maxilla), gilling (behind the operculum), or wedging (around the body girth).
- Baranov's Geometric Principle of Selectivity: The optimal mesh perimeter ($2m$) corresponds directly to the maximum girth ($G$) or opercular girth of the target fish:
- Therefore, the body size, cross-sectional girth, and shape (morphometry) of the target fish species are the primary determinants of the specific mesh size required.
- Correct Option: Option 1 (Body size and shape of target fish).
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