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- Title
Simulations of random fishing behaviour as an independent validation for the effect of active targeting of greenlip abalone (Haliotis laevigata) aggregations.
- Authors
Dowling, Natalie A.; Hall, Stephen J.; McGarvey, Richard
- Abstract
Although active targeting of abalone aggregations is documented for various species, its impact on large aggregations is poorly understood. As large aggregations make the greatest contribution to reproductive success, yet are vulnerable to exploitation, it is important to understand how targeted fishing impacts aggregation structure. If observed postfishing patterns are equally likely to have occurred in response to more random, nontargeted fishing, then changes in aggregation patterns cannot be directly attributed to aggregation-based targeting behaviour. The effect of targeted fishing on greenlip abalone (Haliotis laevigata) aggregations was verified by simulating three different levels of "random" fishing behaviour to generate postfishing aggregation frequency distributions. Comparison of the output with postfishing survey distributions suggested that observed aggregation patterns could not have resulted from random search behaviour. The aggregation survey data can therefore be used as a valid basis on which to quantify both fishing behaviour in terms of aggregation-specific catch patterns and the response of aggregations to fishing.
- Subjects
GREENLIP abalone; FISHING; FISH behavior; FISHES; FISHERIES
- Publication
Canadian Journal of Fisheries & Aquatic Sciences, 2004, Vol 61, Issue 2, p260
- ISSN
0706-652X
- Publication type
Article
- DOI
10.1139/f03-164