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- <meta content="Hobday, A. J." name="eprints.creators_name" />
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- <meta content="Marine invertebrates have long been considered to be resistant to overfishing. However, a growing number
- of exploited taxa have declined substantially and even disappeared from parts of their former range. We consider
- the case of the white abalone (Haliotis sorenseni); the first marine invertebrate proposed for the US endangered
- species list. This high-value species was one of five abalones targeted in the California and Mexico fisheries; it
- is now rare and protected from fishing. The biological characteristics of this deep-living abalone indicate that
- it was particularly vulnerable to over-exploitation; reduction of density or group size is now known to lead
- to declines in fertilization success and recruitment failure. Warning signs of potential problems existed both
- pre- and post-exploitation but were not recognized. In particular, serial depletion was not detected because
- catch was not analyzed spatially, perhaps because total landings were reasonably stable for the short period of
- exploitation. Recent submersible surveys led to estimates that white abalone now number less than 2,600 animals
- or 0.1% of the estimated pre-exploitation population size. Densities and estimated population sizes are less
- than 100 animals, at all but one location. Alternate explanations for the decline in abundance were considered
- and only exploitation-linked factors, such as sub-legal mortality and illegal fishing, were likely contributors.
- Episodic recruitment appears to be a characteristic of broadcast-spawning, long-lived species and may make them
- particularly vulnerable to over-exploitation. Management strategies based on size limits that allow a few years
- of spawning prior to reaching minimum legal size are insufficient. Sustainable fisheries will require multiple
- protected areas to preserve brood stock aggregations necessary for successful fertilization." name="eprints.abstract" />
- <meta content="2001" name="eprints.date" />
- <meta content="published" name="eprints.date_type" />
- <meta content="Reviews in Fish Biology and Fisheries" name="eprints.publication" />
- <meta content="10" name="eprints.volume" />
- <meta content="4" name="eprints.number" />
- <meta content="493-514" name="eprints.pagerange" />
- <meta content="10.1023/A:1012274101311" name="eprints.id_number" />
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- <meta content="http://dx.doi.org/10.1023/A:1012274101311" name="eprints.official_url" />
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- <meta content="Hobday, A. J. and Tegner, Mia and Haaker, Peter L. (2001) Over-exploitation of a broadcast spawning marine invertebrate: Decline of the white abalone. Reviews in Fish Biology and Fisheries, 10 (4). pp. 493-514. ISSN 0960-3166" name="eprints.citation" />
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- <meta content="Over-exploitation of a broadcast spawning marine invertebrate: Decline of
- the white abalone" name="DC.title" />
- <meta content="Hobday, A. J." name="DC.creator" />
- <meta content="Tegner, Mia" name="DC.creator" />
- <meta content="Haaker, Peter L." name="DC.creator" />
- <meta content="300700 Fisheries Sciences" name="DC.subject" />
- <meta content="300000 Agricultural, Veterinary and Environmental Sciences" name="DC.subject" />
- <meta content="300705 Evaluation of Management Strategies" name="DC.subject" />
- <meta content="Marine invertebrates have long been considered to be resistant to overfishing. However, a growing number
- of exploited taxa have declined substantially and even disappeared from parts of their former range. We consider
- the case of the white abalone (Haliotis sorenseni); the first marine invertebrate proposed for the US endangered
- species list. This high-value species was one of five abalones targeted in the California and Mexico fisheries; it
- is now rare and protected from fishing. The biological characteristics of this deep-living abalone indicate that
- it was particularly vulnerable to over-exploitation; reduction of density or group size is now known to lead
- to declines in fertilization success and recruitment failure. Warning signs of potential problems existed both
- pre- and post-exploitation but were not recognized. In particular, serial depletion was not detected because
- catch was not analyzed spatially, perhaps because total landings were reasonably stable for the short period of
- exploitation. Recent submersible surveys led to estimates that white abalone now number less than 2,600 animals
- or 0.1% of the estimated pre-exploitation population size. Densities and estimated population sizes are less
- than 100 animals, at all but one location. Alternate explanations for the decline in abundance were considered
- and only exploitation-linked factors, such as sub-legal mortality and illegal fishing, were likely contributors.
- Episodic recruitment appears to be a characteristic of broadcast-spawning, long-lived species and may make them
- particularly vulnerable to over-exploitation. Management strategies based on size limits that allow a few years
- of spawning prior to reaching minimum legal size are insufficient. Sustainable fisheries will require multiple
- protected areas to preserve brood stock aggregations necessary for successful fertilization." name="DC.description" />
- <meta content="2001" name="DC.date" />
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- <h1 class="ep_tm_pagetitle">Over-exploitation of a broadcast spawning marine invertebrate: Decline of the white abalone</h1>
- <p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Hobday, A. J.</span> and <span class="person_name">Tegner, Mia</span> and <span class="person_name">Haaker, Peter L.</span> (2001) <xhtml:em>Over-exploitation of a broadcast spawning marine invertebrate: Decline of the white abalone.</xhtml:em> Reviews in Fish Biology and Fisheries, 10 (4). pp. 493-514. ISSN 0960-3166</p><p style="margin-bottom: 1em" class="not_ep_block"></p><table style="margin-bottom: 1em" class="not_ep_block"><tr><td valign="top" style="text-align:center"><a href="http://eprints.utas.edu.au/2532/1/Hobday_et_al_2001._WhiteAbalone.pdf"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" class="ep_doc_icon" border="0" /></a></td><td valign="top"><a href="http://eprints.utas.edu.au/2532/1/Hobday_et_al_2001._WhiteAbalone.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />375Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input accept-charset="utf-8" value="3337" name="docid" type="hidden" /><div class=""><input value="Request a copy" name="_action_null" class="ep_form_action_button" onclick="return EPJS_button_pushed( '_action_null' )" type="submit" /> </div></form></td></tr></table><p style="margin-bottom: 1em" class="not_ep_block">Official URL: <a href="http://dx.doi.org/10.1023/A:1012274101311">http://dx.doi.org/10.1023/A:1012274101311</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">Marine invertebrates have long been considered to be resistant to overfishing. However, a growing number
- of exploited taxa have declined substantially and even disappeared from parts of their former range. We consider
- the case of the white abalone (Haliotis sorenseni); the first marine invertebrate proposed for the US endangered
- species list. This high-value species was one of five abalones targeted in the California and Mexico fisheries; it
- is now rare and protected from fishing. The biological characteristics of this deep-living abalone indicate that
- it was particularly vulnerable to over-exploitation; reduction of density or group size is now known to lead
- to declines in fertilization success and recruitment failure. Warning signs of potential problems existed both
- pre- and post-exploitation but were not recognized. In particular, serial depletion was not detected because
- catch was not analyzed spatially, perhaps because total landings were reasonably stable for the short period of
- exploitation. Recent submersible surveys led to estimates that white abalone now number less than 2,600 animals
- or 0.1% of the estimated pre-exploitation population size. Densities and estimated population sizes are less
- than 100 animals, at all but one location. Alternate explanations for the decline in abundance were considered
- and only exploitation-linked factors, such as sub-legal mortality and illegal fishing, were likely contributors.
- Episodic recruitment appears to be a characteristic of broadcast-spawning, long-lived species and may make them
- particularly vulnerable to over-exploitation. Management strategies based on size limits that allow a few years
- of spawning prior to reaching minimum legal size are insufficient. Sustainable fisheries will require multiple
- protected areas to preserve brood stock aggregations necessary for successful fertilization.</p></div><table style="margin-bottom: 1em" cellpadding="3" class="not_ep_block" border="0"><tr><th valign="top" class="ep_row">Item Type:</th><td valign="top" class="ep_row">Article</td></tr><tr><th valign="top" class="ep_row">Additional Information:</th><td valign="top" class="ep_row">The original publication is available at www.springerlink.com
- </td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">endangered species, episodic recruitment, minimum legal size, recruitment failure</td></tr><tr><th valign="top" class="ep_row">Subjects:</th><td valign="top" class="ep_row"><a href="http://eprints.utas.edu.au/view/subjects/300700.html">300000 Agricultural, Veterinary and Environmental Sciences > 300700 Fisheries Sciences</a><br /><a href="http://eprints.utas.edu.au/view/subjects/300000.html">300000 Agricultural, Veterinary and Environmental Sciences</a><br /><a href="http://eprints.utas.edu.au/view/subjects/300705.html">300000 Agricultural, Veterinary and Environmental Sciences > 300700 Fisheries Sciences > 300705 Evaluation of Management Strategies</a></td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">2532</td></tr><tr><th valign="top" class="ep_row">Deposited By:</th><td valign="top" class="ep_row"><span class="ep_name_citation"><span class="person_name">Scholarly Publications Librarian</span></span></td></tr><tr><th valign="top" class="ep_row">Deposited On:</th><td valign="top" class="ep_row">27 Nov 2007 08:33</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">09 Jan 2008 02:30</td></tr><tr><th valign="top" class="ep_row">ePrint Statistics:</th><td valign="top" class="ep_row"><a target="ePrintStats" href="/es/index.php?action=show_detail_eprint;id=2532;">View statistics for this ePrint</a></td></tr></table><p align="right">Repository Staff Only: <a href="http://eprints.utas.edu.au/cgi/users/home?screen=EPrint::View&eprintid=2532">item control page</a></p>
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