Evidence from tag recapture experiments that fish learn to avoid fishing gear |
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Authors: | David J Gilbert Jeremy R McKenzie Nicholas M Davies |
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Institution: | (1) ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, QLD, 4811, Australia |
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Abstract: | We found evidence that tagging induced trap shyness in snapper (Pagrus auratus), i.e., tagged fish had a reduced probability of recapture by the method by which they had originally been caught. Tagging experiments in 1985 and 1994 involving single release over a short period and single recapture were conducted on a closed population (SNA 1: East Northland-Hauraki Gulf-Bay of Plenty). Initial capture was by trawling and by line fishing, while recapture over an extended period included other methods. A test for trap shyness that removed the possible effects of spatial and fish size heterogeneity gave a significant result for both years. The data suggested that the trap shyness effect might have been smaller for trawl-released fish than for line-released fish. However, we estimated a single trap shyness factor (0.71). There was also some evidence for attenuation of trap shyness over time. |
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