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Evidence of large-scale spatial declines in recruitment patterns of southern rock lobster Jasus edwardsii, across south-eastern Australia
Citation
Linnane, A and Gardner, C and Hobday, D and Punt, A and McGarvey, R and Feenstra, J and Matthews, J and Green, B, Evidence of large-scale spatial declines in recruitment patterns of southern rock lobster Jasus edwardsii, across south-eastern Australia, Fisheries Research , 105, (3) pp. 163-171. ISSN 0165-7836 (2010) [Refereed Article]
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DOI: doi:10.1016/j.fishres.2010.04.001
Abstract
Over the past 89 fishing seasons, recruitment has declined in all of the major rock lobster (Jasus edwardsii) fisheries in south-eastern Australia. This has translated into declines in commercial catch rates. In some regions, this decline has been rapid. For example, catch rate in the southern zone fishery of South Australia has decreased by 65% from 2.1 kg/potlift in 2002 to 0.73 kg/potlift in 2008. While trends in recruitment and catch rate are spatially similar, contrasting regional signals are observed from puerulus settlement data which are used to predict future recruitment. Settlement has generally decreased in Tasmania, butsomeof the highest settlements on record were recorded in 2005 and 2006 in South Australia and Victoria. While historical management decisions may have contributed to the current status of rock lobster fisheriesin some areas, simultaneous patterns of decline indicate possible large-scale environmental influences. Specific environmental factors remain largely unknown. However, we present data from an exceptional coldwater upwelling event observed during 2008 which suggests that growth rates in South Australia were significantly impacted. Overall, the results highlight the need for conservative TACCs in fisheries across south-eastern Australia in order to protect existing biomass and sustain rock lobster resources.
Item Details
| Item Type: | Refereed Article |
|---|---|
| Keywords: | southern rock lobster, Jasus edwardsii , recruitment, fishery, management |
| Research Division: | Agricultural, Veterinary and Food Sciences |
| Research Group: | Fisheries sciences |
| Research Field: | Fisheries management |
| Objective Division: | Animal Production and Animal Primary Products |
| Objective Group: | Fisheries - wild caught |
| Objective Field: | Wild caught prawns |
| UTAS Author: | Gardner, C (Professor Caleb Gardner) |
| UTAS Author: | Green, B (Associate Professor Bridget Green) |
| ID Code: | 66033 |
| Year Published: | 2010 |
| Web of Science® Times Cited: | 52 |
| Deposited By: | TAFI - Marine Research Laboratory |
| Deposited On: | 2010-12-16 |
| Last Modified: | 2012-11-19 |
| Downloads: | 0 |
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