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Fewer eggs from larger size limits: counterintuitive outcomes in a spatially heterogeneous fishery


Gardner, C and Hartmann, K and Punt, AE and Hoshino, E, Fewer eggs from larger size limits: counterintuitive outcomes in a spatially heterogeneous fishery, ICES Journal of Marine Science, 72, (1) pp. i252-i259. ISSN 1054-3139 (2014) [Refereed Article]

Copyright Statement

Copyright 2014 International Council for the Exploration of the Sea

DOI: doi:10.1093/icesjms/fsu165


The legal minimum length (LML) of female Southern Rock Lobster (Jasus edwardsii) was reduced in the Tasmanian fishery in 1966 for higher sustainable catches. Originally, the LML was to be reduced in slow growth southern areas only; however, the change was implemented across the entire fishery due to lobbying by commercial fishers. The lower LML has been controversial ever since, including during recent years when low recruitment resulted in a lower total allowable catch (TAC). Fishers argued that this could have been prevented with a higher female LML across the jurisdiction. A length- and sex-based bioeconomic model was used to examine probable outcomes of the larger statewide LML. This model showed that management of egg production would be poorly served by raising the statewide LML because of spatial patterns in the stock and fishery. Catch would be displaced from areas where egg production was already high and into the most depleted areas thus reducing production in areas of greatest concern. Spatial variation in biological parameters can have a profound effect on outcomes of management perceived to be conservative, possibly leading to negative impacts. This risk exists wherever catch is displaced, such as with Marine Protected Areas, spatial TACs and gear restrictions.

Item Details

Item Type:Refereed Article
Keywords:size limits, Jasus edwardsii, sustainable fisheries, egg production
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Fisheries sciences
Research Field:Aquaculture and fisheries stock assessment
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - wild caught
Objective Field:Wild caught rock lobster
UTAS Author:Gardner, C (Professor Caleb Gardner)
UTAS Author:Hartmann, K (Dr Klaas Hartmann)
UTAS Author:Hoshino, E (Dr Eriko Hoshino)
ID Code:95088
Year Published:2014
Web of Science® Times Cited:4
Deposited By:Sustainable Marine Research Collaboration
Deposited On:2014-09-24
Last Modified:2017-11-01

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