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Notes:
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This report provides reliable data on the extent of genetic mixing of the western rock lobsters over its range. The results indicate genetic homogeneity in the western rock lobster in Western Australia thus giving confidence in the accuracy of stock assessments. Secondly, this research's findings on the spatio-temporal pattern of genetic mixing is also critical for validating oceanographic models of larval mixing in the fishery, as well as for providing management with advice that will assist decisions if there is a need to improve locally depleted brood stocks. The data also indicate that the species has good genetic health and has not passed through a bottleneck. This information is useful for fisheries management, giving confidence in the species genetic potential to recover from recent decreases and suggesting that a loss of genetic diversity is unlikely if current management practices and breeding stock sizes are maintained. Genetic bottlenecks are early warning signs of a fishery vulnerable to reduced productivity and loss of evolutionary potential. The genetic health analysis may also be useful in the future since the data provide a base line for any future comparisons. Management responses will need to be evaluated if in future there is evidence of a loss of genetic diversity. Commercial fishers will benefit from our research through a better understanding of the extent of mixing among localities and the spatio-temporal pattern of this mixing. This data will assist the development of management plans that ensure locally depleted stocks are repopulated by connected populations.
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