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Environment
PROJECT NUMBER • 2003-052
PROJECT STATUS:
COMPLETED

Spatial scales of exploitation among populations of demersal scalefish: implications for wetline management

West Australian dhufish is endemic to shelf waters of south-western Western Australia (WA). In contrast, snapper (known as "pink snapper" in WA) has a continuous distribution around the southern coastline of mainland Australia and in New Zealand. Dhufish and snapper are the two most important...
ORGANISATION:
Department of Primary Industries and Regional Development (DPIRD) WA
TAGS
Stock Assessment
Stakeholder
Reproduction
Laboratory Procedures
Habitat
SPECIES
Snapper
West Australian Dhufish
Environment
Environment
Industry
PROJECT NUMBER • 1985-058
PROJECT STATUS:
COMPLETED

Enhancing the availability of pearl oysters for pearl cultivation in WA

The Western Australian Research Laboratories began investigating the feasibility of artificially propagating the silverlip or goldlip pearl oyster, Pinctada maxima, in 1982 and culminated its study by operating a pilot-scale, seasonal hatchery at the Broome Jetty, Broome, Western Australia from 1986...
ORGANISATION:
Department of Primary Industries and Regional Development (DPIRD) WA
TAGS
Reproduction
Husbandry
Biomass
Aquaculture
Industry
PROJECT NUMBER • 1982-025
PROJECT STATUS:
COMPLETED

Feasibility studies on the artificial propagation of pearl oyster seed

The Western Australian Research Laboratories began investigating the feasibility of artificially propagating the silverlip or goldlip pearl oyster, Pinctada maxima, (Jameson) in 1982 and culminated its study by operating a pilot ­scale, seasonal hatchery at the Broome Jetty, Broome, Western...
ORGANISATION:
Department of Primary Industries and Regional Development (DPIRD) WA
TAGS
Reproduction
Husbandry
Fisheries Management
Biomass
Aquaculture
Environment

Growth of pearl oysters in the southern and northern areas of the pearl oyster fishery and examination of environmental influences on recruitment to the pearl oyster stock

Project number: 1995-041
Project Status:
Completed
Budget expenditure: $143,482.00
Principal Investigator: Anthony Hart
Organisation: Department of Primary Industries and Regional Development (DPIRD) WA
Project start/end date: 28 Jun 1995 - 22 Oct 1999
Contact:
FRDC
TAGS
Stock Assessment
Reproduction
Environmental Impact

Objectives

1. To determine growth rates of pearl oysters in the Lacepede Channel and Exmouth Gulf areas
2. To utilize the existing and new knowledge of time lags between spatfall and recruitment to the fishery and the period of vulnerability to fishing to carry out analyses of possible environmental influences on recruitment

Final report

ISBN: 0-7309-8426-5
Author: Anthony Hart
Final Report • 1999-09-20 • 856.74 KB
1995-041-DLD.pdf

Summary

The pearling industry is Australia’s most valuable aquaculture industry, generating approximately $187 million in 1997 (source: ABARE 1997).  The oysters used to culture pearls are derived almost entirely from wild stock shell, rather than hatchery produced stock as occurs in other major pearling industries. Fisheries WA has been conducting a variety of studies on wild stocks of pearl oysters since 1989 to provide the knowledge-base necessary to evaluate their status and set quotas.  Most of these studies have focused on stocks in the 80 Mile Beach and Lacepede Channel areas, which provide about 80% of the annual wild stock quota.  Catch rates in these areas have shown a major upswing in recent years, with the 1993 catch rate being 70% higher than the 10 year average (1983-1992).  The increases in catch rate are believed to arise primarily from a major increase in recruitment, rather than any increases in diver or vessel efficiency. The recent period over which catch rates have increased corresponds with a prolonged El Nino lasting 4 years.  Examination and analysis of environmental and catch data over past years may provide a better understanding of possible environmental influences on pearl oyster recruitment.  However, in order to determine the appropriate time lags between environmental effects at the time of recruitment as spat, and recruitment to the fishery, it was necessary to further develop an understanding of growth in other areas of the fishery.
Industry
PROJECT NUMBER • 1987-082
PROJECT STATUS:
COMPLETED

Research and development of hatchery and nursery culture for the pearl oyster, Pinctada maxima

The Western Australian Pearling Industry is totally reliant on quotas of wild stock silver- or goldlip pearl oysters, Pinctada maxima. Any sustainable expansion of the Industry is unlikely to occur unless hatchery-propagated oysters become available as an alternative source to wild stock....
ORGANISATION:
Department of Primary Industries and Regional Development (DPIRD) WA
TAGS
Reproduction
Population Dynamics
Mortality
Aquaculture
Environment
Environment
PROJECT NUMBER • 1993-091
PROJECT STATUS:
COMPLETED

Fishery independent study of the spawning stock of the western rock lobster

The fishery for western lobster (Panulirus cygnus) has supported an annual catch of about 10 500 tonnes per annum over the last twenty years and is worth between $200-300 million per annum. The fishery has been experiencing increasing exploitation rates over time and estimates in the...
ORGANISATION:
Department of Primary Industries and Regional Development (DPIRD) WA
TAGS
Stock Assessment
Reproduction
Aquaculture
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