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<title>UTas ePrints - Quantifying Shell Hardness in the Southern Rock Lobster (Jasus edwardsii)</title>
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<meta content="Gardner, Caleb" name="eprints.creators_name" />
<meta content="Musgrove, Richard" name="eprints.creators_name" />
<meta content="caleb.gardner@utas.edu.au" name="eprints.creators_id" />
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<meta content="Quantifying Shell Hardness in the Southern Rock Lobster (Jasus edwardsii)" name="eprints.title" />
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<meta content="Southern rock lobsters Jasus edwardsii that are about to
moult or have recently moulted have reduced market value due to higher mortality in live transport, higher cannibalism and lower meat recovery. Limiting the landing of softer shelled lobsters is desirable to maintain product quality; however, attempts to set closed seasons or to introduce industry self-regulation have been hampered by subjectivity in measuring shell hardness. We evaluated the use of durometers as a tool for collecting objective measurements of shell hardness. Of the ten locations on the exoskeleton that were evaluated, two locations along the lateral suture line of the exoskeleton gave most consistent readings and underwent largest changes through the moult. The effects of several factors on durometer readings were evaluated: sex, temperature (ambient plus elevated 3 degrees C), location (from around the coast), and size. No effect on durometer readings could be detected from any of these actors with the exception of lobster size. A cumulative logistic function fitted to grouped data provides a method for predicting time before or after moulting from durometer readings. Although durometers appear to be a valuable tool
for research on closed seasons, there was not sufficient precision for grading of individual lobsters by industry." name="eprints.abstract" />
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<meta content="Cheshuk, B. and Phillips, A. 2002. September 2001 Rock Lobster Fishery. TAFI Internal
Report, University of Tasmania. 36 pp.
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crab Lithodes santolla in the San Jorge Gulf, Argentina. Universidad Nacional, Mar
del Plata (Argentina). 41 pp.
Donahue, D.W., Bayer, R.C., Riley, J.G., Bushway, A.A., Brown, P.B., Hazen, R.A.,
Moore, K.E., and deBruyne, D.A. 1999. The effect of soy-based diets on weight
gain, shell hardness and flavor of the American lobster (Homarus americanus). J.
Aquat. Food Prod. Technol. 8: 69-77.
Dufour, R., Bernier, D., and Brethes, J.C. 1997. Optimisation of meat yield and mortality
during snow crab (Chionoecetes opilio O. Fabricius) fishing operations in eastern
Canada. Can. Tech. Rep. Fish. Aquat. Sci. 38 pp.
Foyle, T.P., Hurley, G.V., and Taylor, D.M. 1989. Field testing shell hardness gauges
for the snow crab fishery. Can. Ind. Rep. Fish. Aquat. Sci. 193: 46.
Gardner, C. and Frusher, S. 2000. Will the removal of closed seasons from the management
system of the Tasmanian rock lobster fishery harm the resource? Hobart,
Tasmanian Aquaculture and Fisheries Institute Technical Report No. 14. p. 35.
Harmeling, J. 2004. Design and development of device to measure the hardness of lobster
shells. Engineering Dept. University of Adelaide Internal Report. 36 p.
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in Tasmania. Tasmanian Abalone Council, Hobart. p. 121.
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Punt, A.E., Kennedy, R.B., and Frusher, S.D. 1997. Estimating the size transition matrix
for Tasmanian rock lobster, Jasus edwardsii. Mar. Freshwat. Res. 48: 981-992.
Sokal, R.R. and Rohlf, F.J. 1995. Biometry, The Principles and Practice of Statistics in
Biological Research. W.H. Freeman, New York.
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slope, N.E. Georges Bank and western Scotian Shelf. Can. Tech. Rep. Fish. Aquat.
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Taylor, D.M., Marshall, G.W., and O'Keefe, P. 1989. Shell hardness in snow crabs
Chionoecetes opilio tagged in soft-shell condition. Nor. Amer. J. Fish. Man. 9:
504-508.
Turner, K., Gardner, C., and Swain, R. 2002. Onset of maturity in male southern rock lobsters
Jasus edwardsii in Tasmania, Australia. Invertebr. Reprod. Dev. 42: 129-135.
Yamasaki, A., Kuwahara, A., Funata, H., Tojima, T., Fujita, S., and Uchino, K. 1993.A
preliminary study on year-class strength of male snow crab Chionoecetes opilio.
Bull. Kyoto Inst. Ocean. Fish. Sci. 16: 1-9.
Ziegler, P.E., Frusher, S.D., Johnson, C.R., and Gardner, C., 2002. Catchability of the
southern rock lobster Jasus edwardsii. I. Effects of sex, season and catch history.
Mar. Freshwat. Res. 53: 1143-1148." name="eprints.referencetext" />
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<meta content="Southern rock lobsters Jasus edwardsii that are about to
moult or have recently moulted have reduced market value due to higher mortality in live transport, higher cannibalism and lower meat recovery. Limiting the landing of softer shelled lobsters is desirable to maintain product quality; however, attempts to set closed seasons or to introduce industry self-regulation have been hampered by subjectivity in measuring shell hardness. We evaluated the use of durometers as a tool for collecting objective measurements of shell hardness. Of the ten locations on the exoskeleton that were evaluated, two locations along the lateral suture line of the exoskeleton gave most consistent readings and underwent largest changes through the moult. The effects of several factors on durometer readings were evaluated: sex, temperature (ambient plus elevated 3 degrees C), location (from around the coast), and size. No effect on durometer readings could be detected from any of these actors with the exception of lobster size. A cumulative logistic function fitted to grouped data provides a method for predicting time before or after moulting from durometer readings. Although durometers appear to be a valuable tool
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<h1 class="ep_tm_pagetitle">Quantifying Shell Hardness in the Southern Rock Lobster (Jasus edwardsii)</h1>
<p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Gardner, Caleb</span> and <span class="person_name">Musgrove, Richard</span> (2006) <xhtml:em>Quantifying Shell Hardness in the Southern Rock Lobster (Jasus edwardsii).</xhtml:em> Journal of Aquatic Food Product Technology, 15 . pp. 17-35. ISSN 1049-8850</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/617/1/shell_hardness_final.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/617/1/shell_hardness_final.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />543Kb</td></tr></table><p style="margin-bottom: 1em" class="not_ep_block">Official URL: <a href="http://dx.doi.org/10.1300/J030v15n02_03">http://dx.doi.org/10.1300/J030v15n02_03</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">Southern rock lobsters Jasus edwardsii that are about to
moult or have recently moulted have reduced market value due to higher mortality in live transport, higher cannibalism and lower meat recovery. Limiting the landing of softer shelled lobsters is desirable to maintain product quality; however, attempts to set closed seasons or to introduce industry self-regulation have been hampered by subjectivity in measuring shell hardness. We evaluated the use of durometers as a tool for collecting objective measurements of shell hardness. Of the ten locations on the exoskeleton that were evaluated, two locations along the lateral suture line of the exoskeleton gave most consistent readings and underwent largest changes through the moult. The effects of several factors on durometer readings were evaluated: sex, temperature (ambient plus elevated 3 degrees C), location (from around the coast), and size. No effect on durometer readings could be detected from any of these actors with the exception of lobster size. A cumulative logistic function fitted to grouped data provides a method for predicting time before or after moulting from durometer readings. Although durometers appear to be a valuable tool
for research on closed seasons, there was not sufficient precision for grading of individual lobsters by industry.</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">http://www.haworthpress.com/web/JAFPT</td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">Rock lobster, Jasus edwardsii, closed seasons, shell
hardness, durometer</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></td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">617</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">Dr Caleb Gardner</span></span></td></tr><tr><th valign="top" class="ep_row">Deposited On:</th><td valign="top" class="ep_row">25 Jan 2007</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=617;">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=617">item control page</a></p>
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