Standard Talk (15 mins) Australian Society for Fish Biology Conference 2022

Opportunities and impacts of range-extending scalefish species: Understanding population dynamics, ecosystem impacts and management needs (#56)

Alexia Graba-Landry 1 , Curtis Champion 2 , James Haddy 1 , Jeremy Lyle 1 , David Mossop 1 3 , Rod Pearn 3 , Gretta Pecl 1 4 , Heidi Pethybridge 5 , Barrett Wolfe 1 , Sean Tracey 1
  1. University of Tasmania, Taroona, TASMANIA, Australia
  2. New South Wales Department of Fisheries, Coffs Harbour, NSW, Australia
  3. Department of Natural Resources and Environment Tasmania, Hobart, Tasmania, Australia
  4. Centre for Marine Socioecology, Hobart, Tasmania, Australia
  5. Oceans and Atmosphere, CSIRO, Hobart, Tasmania, Australia

The biology and diet were quantified for three key range shifting species in Tasmania with both recreational and commercial fishery value—Yellowtail Kingfish (Seriola lalandi), Snapper (Chrysophrys auratus) and King George Whiting (Sillaginodes punctatus). The project was heavily reliant on engagement from the recreational fishing community and multiple citizen science initiatives. Our primary approach was a state-wide fish frame donation program which was implemented in 2019, with a network of 16 drop-off locations along most of coastal Tasmania. This data set was also supplemented with historical data from the IMAS archives, and with fishery-independent sampling for fish outside of the legal size limits. These data were used to quantify life-history parameters (age, population structure, growth, reproduction, mortality), and diet for the three species. This information was then used in both species distribution modelling and Atlantis ecosystem modelling to predict how suitable habitats for each species may shift under future climate change projections and indicate the potential changes to the ecosystem (i.e. food web) if and when they do shift. The species distribution modelling was in part reliant on citizen science data, specifically species occurrence records, reported to the Range Extending Database and Mapping Project (Redmap), survey data from the Reef Life Survey, and historical occurrence records from the Atlas of Living Australia. The results provide important baseline and predictive information on these species for effective management of these emerging fisheries in Tasmania.