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The assessment of fishery status depends on the condition of fish habitats

View ORCID ProfileChristopher J. Brown, Andrew Broadley, Fernanda Adame, Trevor A. Branch, Mischa Turschwell, Rod M. Connolly
doi: https://doi.org/10.1101/233478
Christopher J. Brown
1Australian Rivers Institute, Griffith University, Nathan, QLD, 4111, Australia
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Andrew Broadley
1Australian Rivers Institute, Griffith University, Nathan, QLD, 4111, Australia
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Fernanda Adame
1Australian Rivers Institute, Griffith University, Nathan, QLD, 4111, Australia
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Trevor A. Branch
2School of Aquatic and Fishery Sciences, Box 355020, University of Washington, Seattle, WA 98195, USA
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Mischa Turschwell
1Australian Rivers Institute, Griffith University, Nathan, QLD, 4111, Australia
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Rod M. Connolly
3Australian Rivers Institute – Coast and Estuaries, School of Environment, Griffith University, Gold Coast, QLD, 4222, Australia
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Abstract

At the crux of the debate over the global sustainability of fisheries is what society must do prevent overexploitation of fisheries and aid recovery of fisheries that have historically been overexploited. The focus of debates has been on controlling fishing pressure and assessments have not considered that stock production may be affected by changes in fish habitat. Fish habitats are being modified by climate change, built infrastructure, destructive fishing practices and pollution. We conceptualise how the classification of stock status can be biased by habitat change. Habitat loss can result in either overly optimistic or overly conservative assessment of stock status. The classification of stock status depends on how habitat affects fish demography and what reference points management uses to assess status. Nearly half of the 418 stocks in a global stock assessment database use seagrass, mangroves, coral reefs and macroalgae, habitats that have well documented trends. There is also considerable circumstantial evidence that habitat change has contributed to overexploitation or enhanced production of data-poor fisheries, like inland and subsistence fisheries. Globally many habitats are in decline, so the role of habitat should be considered when assessing the global status of fisheries. New methods and global databases of habitat trends, and use of habitats by fishery species are required to properly attribute the causes of decline in fisheries, and are likely to raise the profile of habitat protection as an important complementary aim for fisheries management.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY 4.0 International license.
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Posted December 13, 2017.
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The assessment of fishery status depends on the condition of fish habitats
Christopher J. Brown, Andrew Broadley, Fernanda Adame, Trevor A. Branch, Mischa Turschwell, Rod M. Connolly
bioRxiv 233478; doi: https://doi.org/10.1101/233478
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The assessment of fishery status depends on the condition of fish habitats
Christopher J. Brown, Andrew Broadley, Fernanda Adame, Trevor A. Branch, Mischa Turschwell, Rod M. Connolly
bioRxiv 233478; doi: https://doi.org/10.1101/233478

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