13 results

Stable isotopes: a rapid method to determine lobster diet and trace lobster origin?

Project number: 2021-020
Project Status:
Completed
Budget expenditure: $31,890.00
Principal Investigator: John P. Keane
Organisation: University of Tasmania
Project start/end date: 30 Jun 2021 - 29 Jun 2022
Contact:
FRDC

Need

1. Tracing lobster origin
The need for determining whether stable isotopes are a useful tool for diet analysis and identification of catch location is a priority for the SRL fishery. If proved useful, this technology will allow for rapid identification and isolation of stock abnormalities – such as toxic algal blooms, which has potential to save a lot of time and money for fisheries management.

2. Invasive urchin controls
If results show that small lobsters do predate on urchins, this will be important for informing stock rebuilding targets and reference points relative to urchin control. Primarily we could advise on whether urchin control targets and performance indicators should be based on total lobster biomass or only large lobster biomass. For example, if small lobsters (140mm CL) are found to actively predate on small urchins, the pressure to rebuild the large lobster biomass (>140mm CL) may be reduced. This could in turn help to adapt the rebuild strategy, in line with effective urchin control.

Objectives

1. To determine the level of stable isotope variation within individual lobster tissues (e.g. muscle vs shell) and identify a non-lethal and minimally destructive method of sampling for stable isotopes.
2. To describe lobster diet off eastern Tasmania and quantify the role of smaller lobsters (&lt
140mm CL) in the predation and control of Longspined Sea Urchin in Tasmania.
3. To ascertain if stable isotopes can be used to identify catch location of individual lobsters post-harvest across SE Australia

Final report

ISBN: 978-1-922708-49-6
Authors: Jennifer E. Smith John Keane Michael Oellermann Craig Mundy & Caleb Gardner
Final Report • 2023-05-01 • 1.66 MB
2021-020-DLD.pdf

Summary

Scientists at IMAS conducted a stable isotope study on Southern Rock Lobster (Jasus edwardsii) collected from Southern Australian sites to determine whether or not capture site could be determined post-harvest.
Environment
Environment
PROJECT NUMBER • 2018-124
PROJECT STATUS:
COMPLETED

Southern Ocean IPA - Science to support Australia’s Southern Ocean Fisheries 2018-2020

This collaborative project between the Australian Antarctic Division (AAD) and the Institute for Marine and Antarctic Studies (IMAS) addressed key research needs between 2018 and 2020 for Patagonian Toothfish (Dissostichus eleginoides), Antarctic Toothfish (Dissostichus mawsoni) and Mackerel Icefish...
ORGANISATION:
University of Tasmania
Blank
PROJECT NUMBER • 2018-070
PROJECT STATUS:
COMPLETED

Opportunities and impacts of range extending scalefish species: understanding population dynamics, ecosystem impacts and management needs

This work set out to quantify the biology and diet of three key range-shifting species in Tasmania with both recreational and commercial fishery value. The project was heavily reliant on engagement from the recreational fishing community and multiple citizen science initiatives, as well as...
ORGANISATION:
University of Tasmania
Industry
PROJECT NUMBER • 2017-210
PROJECT STATUS:
COMPLETED

National fisheries and aquaculture industry social and economic contributions study: Phase 1

This report presents estimates of the economic contribution of Australia’s fisheries and aquaculture industries to the Australian community for 2017/18. It forms part of the National Fisheries and Aquaculture Industry Contributions Study (FRDC project 2017-210) which was funded by the...
ORGANISATION:
University of Tasmania
Adoption
PROJECT NUMBER • 2017-106
PROJECT STATUS:
COMPLETED

Communicating the research, management and performance of Tasmanian marine resource industries by video

This project involved the production of videos that summarised the research and industry activities for fisheries and aquaculture in Tasmania. The six sector fisheries and aquaculture groups represented in the videos are rock lobster fisheries, abalone fisheries, recreational fisheries, small scale...
ORGANISATION:
University of Tasmania
Industry
PROJECT NUMBER • 2017-086
PROJECT STATUS:
COMPLETED

Improved risk management of paralytic shellfish toxins in Southern Rock Lobster

To examine toxicokinetics of PST in Southern Rock Lobster, an experimental study was undertaken in a biosecure aquaculture facility in South Australia. Adult male lobsters were fed highly toxic mussels (6 mg STX.2HCl equiv. kg−1) sourced from the Tasmanian east coast for 4...
ORGANISATION:
University of Tasmania
Communities
PROJECT NUMBER • 2016-128
PROJECT STATUS:
COMPLETED

Human Dimensions Research Subprogram management

A National RD&E Workshop was held on 21 September 2018 in Adelaide, South Australia, in which representatives of industry, research, management, and service providers addressed how to make a positive difference to the mental health of people in fisheries and aquaculture. The impetus for the...
ORGANISATION:
University of Tasmania
Environment
PROJECT NUMBER • 2016-067
PROJECT STATUS:
COMPLETED

Understanding oxygen dynamics and the importance for benthic recovery in Macquarie Harbour

This report provides an update on the status of dissolved oxygen (DO) and benthic conditions in Macquarie Harbour. It follows on from the results outlined in the IMAS reports released in January, May, September 2017 and January 2018. These reports described a deterioration of benthic and water...
ORGANISATION:
University of Tasmania
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