28 results
Environment
PROJECT NUMBER • 2019-005
PROJECT STATUS:
COMPLETED

Risk analysis to identify and minimise biosecurity risks arising from recycling bivalve mollusc shell waste during shellfish reef restoration projects in Australia

The assessment indicated that heating recycled mollusc shells in water to 80°C for at least 5 minutes would meet the ALOP for all diseases (despite uncertainly for some disease agents due to lack of information, as indicated by ?), and was within the ALOP for all pests of concern. This method...
ORGANISATION:
DigsFish Services Pty Ltd
Industry
PROJECT NUMBER • 2017-057
PROJECT STATUS:
COMPLETED

Stock predictions and spatial population indicators for Australia's east coast saucer scallop fishery

This project undertook analyses to understand the role of overfishing and the environment on saucer scallops. The analyses indicated reduced numbers of spawning scallops. Historical levels of fishing and environmental influences such as from increased sea surface temperatures (SST) have amplified...
ORGANISATION:
Department of Primary Industries (QLD)
Industry
PROJECT NUMBER • 2017-048
PROJECT STATUS:
COMPLETED

Improving mortality rate estimates for management of the Queensland Saucer Scallop fishery

This research was undertaken on the Queensland saucer scallop (Ylistrum balloti) fishery in southeast Queensland, which is an important component of the Queensland East Coast Otter Trawl Fishery (QECOTF). The research was undertaken by a collaborative team from the Queensland Department...
ORGANISATION:
Department of Primary Industries (QLD)
Environment
PROJECT NUMBER • 2016-015
PROJECT STATUS:
COMPLETED

Proposed northern Australia water developments pertinent to the Northern Prawn Fishery: collation and review

The project reviewed the legislation dealing with Water Resource Management in each of Queensland, the Northern Territory, and Western Australia that effects the management of overland flow in catchments that empty into water managed as part of the Northern Prawn Fishery. The project...
ORGANISATION:
CSIRO Oceans and Atmosphere Hobart

Understanding recruitment variation (including the collapse) of Saucer Scallop stocks in Western Australia and assessing the feasibility of assisted recovery measures for improved management in a changing environment

Project number: 2015-026
Project Status:
Completed
Budget expenditure: $205,962.00
Principal Investigator: Mervi Kangas
Organisation: Department of Primary Industries and Regional Development (DPIRD) WA
Project start/end date: 30 Jul 2015 - 30 Aug 2016
Contact:
FRDC

Need

The perception that fisheries collapse or recruitment failure is the result of overfishing reflects badly on industry, researchers and managers. It is important therefore to understand the cause of recruitment variation (and failures) and to clearly explain these to stakeholders. In light of recent stock surveys, indicating extremely low levels of recruits and adults, it is likely that natural recovery is now impeded due to insufficient spawning stock to produce successful recruitment even under ideal environmental conditions. Closure of these fisheries has had a major financial impact on the industry. This led to a workshop of scallop experts, industry and managers to discuss the cause of the collapses; whether these conditions are likely to remain and if they will improve to permit some recovery. Due to very low stock abundance it could be that the breeding stock is too low or the survival of larvae/juveniles has been reduced to compromise a significant stock recovery.

An urgent need was identified to understand recruitment variation including the initial stock collapse, investigate the potential of assisted recovery measures (such as restocking) to re-establish founder populations in these extremely depleted stocks, and provide management/industry with a cost-benefit evaluation of these measures to aid recovery. Fishery restoration through assisted recovery has shown some success with Roe’s Abalone in WA and may lend itself as a management tool in a changing marine environment.

Objectives

1. Understanding factors influencing recruitment variations in existing scallop WA stocks, particularly the collapse of the stocks in 2011
2. Determining feasibility of re-establishing founder population of scallops in the Abrolhos Islands and Shark Bay through seeding of hatchery produced juveniles
3. Determining feasibility of re-establishing founder population of scallops in the Abrolhos Islands through translocations

Final report

ISBN: 978-1-921258-63-3
Authors: A. Chandrapavan M.I. Kangas N. Caputi
Final Report • 2020-07-01 • 5.35 MB
2015-026-DLD.pdf

Summary

This study examined possible contributing environmental factors to the recruitment variability of the Ballot’s saucer scallop Ylistrum balloti across the main stocks in Western Australia. The project was undertaken to explain the variation observed between years and between regions as well elucidating the potential cause of a major decline in scallop stocks following an extreme marine heatwave, with these findings intended to improve future management advice.
Secondly this project was to examine the feasibility of using assisted recovery through seeding of hatchery produced juveniles or translocation of mature breeding stock or immature scallops.
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