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The effectiveness of broad-scale legal minimum lengths for protecting spawning biomass of Haliotis rubra in Tasmania


Helidoniotis, F and Haddon, M, The effectiveness of broad-scale legal minimum lengths for protecting spawning biomass of Haliotis rubra in Tasmania, New Zealand Journal of Marine and Freshwater Research, 48, (1) pp. 70-85. ISSN 0028-8330 (2014) [Refereed Article]

Copyright Statement

Copyright 2014 The Royal Society of New Zealand

DOI: doi:10.1080/00288330.2013.843574


A legal minimum length (LML) aims to protect spawning biomass but the implementation uncertainty associated with broad scale LMLs is rarely assessed. LML estimates can require both growth and maturity data; however, growth data is often lacking and this can limit the estimation of an appropriate LML. To overcome the shortfall in growth data, a method is introduced for inferring growth parameters from size at maturity data. In this way, fine scale theoretical LML estimates were obtained in the absence of empirical growth data. A total of 252 populations of blacklip abalone (Haliotis rubra) were examined and, of those, 46 were identified as having a relatively lower level of protection because they matured at larger sizes. These 46 populations are potentially at greater risk of over fishing as a consequence of implementation uncertainty. Furthermore, the majority of the 46 populations were in an economically valuable region of the fishery. With extensive data on size at maturity, the relative risk to recruitment potential can be assessed and equalised across a fishery.

Item Details

Item Type:Refereed Article
Keywords:Haliotis rubra, legal minimum length, inverse logistic, spawning stock biomass, implementation uncertainty, Australia
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Fisheries sciences
Research Field:Fisheries management
Objective Division:Environmental Management
Objective Group:Marine systems and management
Objective Field:Marine biodiversity
UTAS Author:Helidoniotis, F (Dr Fay Helidoniotis)
ID Code:98696
Year Published:2014
Web of Science® Times Cited:3
Deposited By:Sustainable Marine Research Collaboration
Deposited On:2015-02-25
Last Modified:2015-05-18

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