Estimating historical commercial rock lobster (Jasus edwardsii) catch inside Australian State territorial waters for marine protected area assessment: the binomial likelihood method |
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Authors: | Richard McGarvey Adrian Linnane |
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Institution: | (1) South Australian Research and Development Institute (Aquatic Sciences), West Beach, South Australia, 5024, Australia;(2) South Australian Research and Development Institute (Aquatic Sciences), P.O. Box 120, Henley Beach, South Australia, 5022, Australia |
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Abstract: | The rock lobster (Jasus edwardsii) fishery of South Australia is the State’s most valuable fisheries resource with an export value exceeding ~AU$100 million.
The fishery operates primarily inshore (<60 m), and overlaps with a series of marine protected areas (MPAs) currently proposed
for State territorial waters. As a result, the need to quantify the impact of proposed MPAs on commercial landings of rock
lobster within territorial waters is an integral part of the MPA assessment process. Removing fishing effort displaced by
MPAs prevents a corresponding increase in exploitation outside protected zones. We describe a binomial likelihood method that
utilises historical commercial catch data to estimate catch totals of rock lobster inside South Australian State waters. Lobster
catches per km2 showed a high level of spatial variation with estimated historical lobster catch in State waters spanning approximately three
orders of magnitude. The method identified key areas where high lobster catch (up to 500 kg/km2) overlapped with State waters. Binomial likelihood outputs have particular application to the estimation of net catch loss
in situations where fishery buy-back or financial compensation are a considered option as part of the MPA implementation process. |
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Keywords: | Binomial likelihood Displaced effort Marine protected area Rock lobster |
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