Developing a cost-effective monitoring regime and stock assessment for Sand Flathead in Tasmania

Project number: 2020-005
Project Status:
Current
Budget expenditure: $703,700.00
Principal Investigator: Sean Tracey
Organisation: University of Tasmania (UTAS)
Project start/end date: 31 Dec 2020 - 29 May 2026
Contact:
FRDC
TAGS
Stock Assessment
Recreational Fishing
Rac Tas
Population Dynamics
Migration
SPECIES
Southern Sand Flathead

Need

Sand Flathead account for well over half of the total catch (by numbers) taken by marine recreational fishers in Tasmania and represent the mainstay of Tasmania's recreational fishery. Furthermore, since the recreational catch of sand flathead is more than 20 times the commercial catch, trends in commercial catch and catch rates are of little value in inferring changes in stock status. This has meant that fishery independent or novel assessment methods are required. To date, IMAS has implemented a research program focused on sand flathead in the south-east of the state that provides a spatially restricted, perspective and semi-quantitative evaluation of stock condition. Given the significance of the species and a status of 'depleting' in the latest stock assessment report, there is a need to implement a more comprehensive stock monitoring approach throughout the state that can support the development of a spatially explicit quantitative stock assessment model. There is also a need to determine the appropriate spatial resolution to apply to the stock assessment model. As such, there is a need to understand the extent of adult movement and ontogenetic connectivity of regional sub-populations of sand flathead throughout Tasmania. In addition, by collation of biological data sets from historical studies and surveys conducted around Tasmania the extent and direction of potential changes in population size structures, and life history characteristics will be investigated. Where possible collated biological data will be used to assess spatial and temporal changes in life history characteristics to assess the implications of selective excessive fishing pressure and/or past and future climate change effects for this species.

Objectives

1. Review and collate available biological and fishery data collected on sand flathead within Tasmanian waters
2. Design, implement and assess the effectiveness of fishery dependent and fishery independent biological sample collection techniques for sand flathead
3. Determine the spatial and temporal variability of key life history characteristics and population structures of sand flathead
4. Investigate movement and connectivity of sand flathead within Tasmania
5. Develop a quantitative region-age-sex structured fishery assessment model for sand flathead
6. Identify management scenarios for consideration

Related research

All research
research
Environment
Environment
Environment

Compilation of information for the US Marine Mammal Protection Act Comparability Finding process

Project number: 2019-212
Project Status:
Completed
Budget expenditure: $77,840.00
Principal Investigator: Alice I. Mackay
Organisation: Alice Ilona Mackay
Project start/end date: 11 Oct 2020 - 18 Feb 2021
Contact:
FRDC
TAGS
Resource Rehabilitation
Population Dynamics
Mortality
Market Opportunities
Fisheries Management

Need

The Department of Agriculture, Water and Environment require relevant information be collated on marine mammal populations that interact with fisheries classified as 'export' under the provisions of the US Marine Mammal Proection Act.

The Department of Agriculture, Water and Environment have listed several marine mammal species for which mortalities have been recorded in Australian fisheries and require an estimate of Nmin, Rmax and Fr for each of these species in order to determine for which a PBR approach is currently feasible. Data deficiencies that prevent PBR being calculated for a given species need to be determined and potential approaches to obtain relevant information identified.

If PBR is not a feasible approach to be undertaken for any of the marine mammal species identified, other relevant data for each species and 'export' fishery will need to collated in order for NOAA to be able to determine if a comparability finding for that fishery can be granted. This could include information on the level of monitoring in that fishery, temporal or spatial overlap with the marine mammals species and existing management of interactions such as fishery specific bycatch management strategies.

Objectives

1. Where possible provide estimates of maximum potential population growth rate (Rmax), minimum estimate of abundance (Nmin) and recovery factor (FR) for each species of marine mammal listed by the Department of Agriculture, Water and Environment.
2. For each marine mammal species compile requested information on listed status under Australian and US legislation, including temporal and spatial overlap with relevant fisheries or jurisdictions, information on population structure and behavioural traits of that species that make it more or less likely to interact with fishing operations, and existing bycatch management strategies.
3. Given existing data, determine the ability to calculate PBR for marine mammal species as a means of applying bycatch limits in Australian fisheries, and, if PBR cannot be calculated, investigate specific fisheries management arrangements, including bycatch monitoring regimes, and other information available for each ‘export’ fishery where interactions with marine mammals have been recorded, and provide an assessment of the potential level of impact of interactions for each species and / or population. Where appropriate, identify additional information that could be collected, for each marine mammal species and ‘export’ fishery, that in lieu of PBR, could assist the US in determining a ‘comparability rating’ for that fishery.

Final report

Author: Alice I. Mackay
Final Report • 2021-09-01 • 5.73 MB
2019-212-DLD.pdf

Summary

Recent changes to legislation in the United States (US) requires that nations importing seafood must demonstrate that they have a regulatory program for reducing marine mammal bycatch that is comparable in effectiveness to the US standards under the ‘Fish and Fish Product Import Provisions’ of the Marine Mammal Protection Act 1972 (MMPA). A comparability finding means the marine mammal protection provisions in the relevant fishery are recognised to be equivalent to that of the United States.
Several Australian commercial fisheries have received an ‘exempt’ classification under the MMPA import provisions which means they have been determined to have a remote likelihood, or no known incidental mortality of marine mammals. The remaining fisheries that are seeking a comparability finding have been classified as ‘export’ fisheries as they were determined to have more than a likelihood of incidental mortality to marine mammals. For each of these fisheries, the US requires information on monitoring programs in the fishery, levels of marine mammal bycatch, the species and ‘stocks’ (populations) involved, and the management strategies in place to mitigate bycatch.
This report synthesises the required information for 15 Australian Commonwealth managed commercial fisheries or fishery subsectors, and 29 Australian State and Territory commercial fisheries that are seeking a comparability finding under the US MMPA. Reports and / or observations of marine mammal interactions in Australian commercial fisheries that are not seeking export approval are also synthesised as this information is also required as part of the comparability finding process.