ASFB Home > 2007 > Does rock lobster (Jasus edwardsii) translocation impact on inshore temperate reef invertebrate communities in South Australia?
Does rock lobster (Jasus edwardsii) translocation impact on inshore temperate reef invertebrate communities in South Australia?
SARDI Aquatic Sciences, PO Box 120 Henley Beach SA 5022.
Current markets for southern rock lobster (Jasus edwardsii) demand small (~1kg), “red” coloured individuals that are primarily located within inshore (<60m depth) grounds. As a result, fishing effort in recent seasons has shifted inshore, while offshore waters containing “speckled” low-value lobsters remain largely unfished. In South Australia, the feasibility of translocating offshore lobsters to inshore sites to promote colour change, and therefore market value, is currently being examined. In January 2007, a total of 2000 lobsters were translocated to an inshore reef at Ringwood, South Australia. To investigate potential ecological impacts of translocation on the inshore reef invertebrate community, dive surveys were conducted before and after translocation at both experimental and control sites. Surveys targeted the abundance of large (>50mm) motile invertebrates as estimated on three permanent 50m transects. Preliminary analysis found no initial difference in invertebrate community structure between control and experimental sites, which were dominated by sea urchins Heliocidaris erythrogramma, rock lobsters J. edwardsii, and feather stars (genus Cenolia). Resurveys, undertaken seven weeks after translocation, indicated that while lobster numbers increased significantly at experimental sites as expected, no interaction between treatment and time was detected between control and experimental sites. Future surveys are planned for 2007/08 to monitor potential long-term changes.
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