36,851 results
Environment
PROJECT NUMBER • 2017-047
PROJECT STATUS:
COMPLETED

Understanding environmental and fisheries factors causing fluctuations in mud crab and blue swimmer crab fisheries in northern Australia to inform harvest strategies

This project investigated relationships between environmental factors and harvests of crabs in the Gulf of Carpentaria (GoC), northern Australia. Desktop correlative analyses clearly indicated that recent fluctuations in the catches of Giant Mud Crabs in the GoC are most likely driven by...
ORGANISATION:
Department of Primary Industries (QLD)

Utilisation of boat ramp cameras to estimate recreational fishing catch and effort in key Victorian fisheries

Project number: 2021-008
Project Status:
Current
Budget expenditure: $142,200.00
Principal Investigator: Justin D. Bell
Organisation: Victorian Fisheries Authority (VFA) Queenscliff
Project start/end date: 30 Jun 2021 - 29 Aug 2024
Contact:
FRDC

Need

There is no current information on total recreational fishing effort or landings for Victorian fisheries and therefore no continuous time series on these variables, as is the case in most jurisdictions. This represent a key knowledge gap, and hence risk, for fisheries sustainability in the state and has resulted in several fisheries (i.e. those with significant recreational catch) being assessed as ‘Undefined’ in the most recent SAFS round.
In addition to the above, the Victorian Government has brought out several bay and inlet fisheries over the last two decades, meaning recreational catch is the most significant harvest component for most species/stocks. This also means that there is no longer commercial logbook data being obtained on which to base assessment of these species/stocks. As such, having recreational catch and effort information will enable more sophisticated population dynamic stock assessment models to be used for assessment purposes. Victoria possesses such a model that is parameterised for the Western Victorian Snapper Stock (WVSS), complete with management strategy evaluation, that cannot be used to inform decision making at present because the landings from the largest fleet (i.e. boat based recreational fishers) are currently unknown.
Recreational catch and effort information will be used for ongoing stock assessment to inform management advice to inform the following immediate, direct priorities: 1) WVSS harvest strategy, 2) rebuilding of the Gippsland Lakes black bream stock, 3) Corner Inlet Management Plan, and 4) assessment of the eastern Victorian snapper stock.

Objectives

1. Calibration of boat ramp camera infrastructure
2. Extrapolation of fishing effort to boat ramps that do not have cameras using Google Earth imagery
3. Combining fishing effort information derived from boat ramp cameras and Google Earth with creel survey data to estimate the fishing effort and landings of snapper in Port Phillip Bay, the total boat based recreational landings in Corner Inlet and landings of black bream in the Gippsland Lakes

Maintaining productivity and access to Estuary Cockle across sectors through improved science-based decision making

Project number: 2021-003
Project Status:
Current
Budget expenditure: $685,927.00
Principal Investigator: Matt D. Taylor
Organisation: NSW Department Of Primary Industries Port Stephens
Project start/end date: 2 Oct 2022 - 29 Mar 2026
Contact:
FRDC
SPECIES

Need

The lack of knowledge on fundamental fisheries biology, uncertainty in stock structure, population dynamics, and cross-sectoral harvest levels, means that current stock assessments are unequipped to reliably determine stock status or inform recommended biological catches (RBCs), and that management of the resource occurs within a high degree of uncertainty. These EXCEPTIONAL INCREASES IN HARVEST and UNCERTAINTY SURROUNDING SUITABLE RBCs create an URGENT NEED TO DEAL WITH THE SUBSTANTIAL KNOWLEDGE VACUUM FOR THIS RESOURCE. Without this improved knowledge, the reasonable assessment of the status of the resource, estimation of appropriate harvest levels, harvest strategy development, implementation of appropriate management, and informed decision making on how best to utilise the resource, will continue not to be possible. Furthermore, environmental variability and species-habitat-fishery interactions are likely to impact stock dynamics and biomass, which in turn affects the magnitude, profitability, and social outcomes derived from the resource. Thus, efficient exploitation and effective management of the resource within a harvest strategy framework cannot occur without: 1) spatial definition of likely management units (stock structure); 2) estimates of stock biomass within those units; 3) estimates of basal population parameters and some appreciation of the influence of environmental stochasticity on resource productivity; and, 4) an appreciation of resource access across sectors. There is likely potential for further development in this fishery, to satisfy growing markets for the species both locally and abroad, but this will never be realised until these information needs are met.

Objectives

1. Identify stock structure for Estuary Cockle across NSW
2. Design appropriate fishery-independent survey methodologies to support both priority research objectives, and ongoing monitoring of stock biomass
3. Characterise basal population parameters and spatial and temporal patterns in biomass and recruitment, within a broader context of environmental drivers and species-habitat interactions
4. Improve knowledge on recreational, aboriginal and IUU harvest of the resource
5. Integrate information on biology, ecology, harvest, stressors, impacts, and current/future management arrangements into an Ecological Risk Assessment framework, to define future management, compliance, and communication priorities
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