eCite Digital Repository

Can commercial harvest of the long-spined sea urchin, Centrostephanus rodgersii, reduce the impact of destructive urchin grazing on macroalgae communities and associated fisheries?

Citation

Keane, JP and Mundy, CN and Johnson, OJ and Ling, SD, Can commercial harvest of the long-spined sea urchin, Centrostephanus rodgersii, reduce the impact of destructive urchin grazing on macroalgae communities and associated fisheries?, Australian Society of FIsheries Biology Program, 22-24 July 2017, Albany, WA, pp. 60. (2017) [Conference Extract]

Microsoft Word (Conference abstract)
Pending copyright assessment - Request a copy
15Kb
  

Abstract

Range extension of the long-spined sea urchin, Centrostephanus rodgersii, to south-eastern Tasmania has resulted in overgrazing of macroalgae habitats as far south as the Tasman Peninsula. The increasing loss of macroalgae and the formation of extensive barrens is threatening reef biodiversity as well as lucrative reef dependent fisheries such as abalone and rock lobster. A commercial fishery for long-spined urchin in Tasmania was established in 2008 and to date over 400 tonnes has been harvested. Dive surveys show that with increased fishing pressure there is a significant decline in the in size and age structure in urchin populations, as well as decreases in total biomass. Macroalgae recovery is occurring in some heavily fished areas, while barrens continue to expand in unfished areas. Analysis of boat-based GPS data logger and depth logger technologies used by commercial urchin and abalone divers indicates that >50% of urchin fishing activity overlaps spatially with abalone fishing activity. The extent of direct spatial overlap between these fisheries suggests there is good reason to expect that urchin fishing as currently observed could have direct benefits for the abalone fishery in terms of reducing abundance of urchins within or adjacent to key abalone fishing grounds.

Item Details

Item Type:Conference Extract
Keywords:urchin, fisheries, range extension, climate change
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and Estuarine Ecology (incl. Marine Ichthyology)
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Marine Flora, Fauna and Biodiversity
UTAS Author:Keane, JP (Dr John Keane)
UTAS Author:Mundy, CN (Dr Craig Mundy)
UTAS Author:Johnson, OJ (Miss Olivia Johnson)
UTAS Author:Ling, SD (Dr Scott Ling)
ID Code:126629
Year Published:2017
Deposited By:Sustainable Marine Research Collaboration
Deposited On:2018-06-20
Last Modified:2018-06-21
Downloads:0

Repository Staff Only: item control page