689 results
Industry
Environment
PROJECT NUMBER • 1998-212
PROJECT STATUS:
COMPLETED

Determination of the disease status of Western Australian commercial prawn stocks

There is little published information on the disease status of the prawns on the north-west shelf, yet these prawns (Fenneropenaeus merguiensis, Metapenaeus endeavouri, Penaeus esculentus and Melicertus latisulcatus) form the basis of a commercial fishery worth in excess of A$42 million in...
ORGANISATION:
Department of Primary Industries and Regional Development (DPIRD) WA
SPECIES
People
Environment
Environment
PROJECT NUMBER • 1981-020
PROJECT STATUS:
COMPLETED

Investigations into QX disease in oysters and other problems associated with marine parasites

This long running FIRTA grant supported a center in Australia for research, consultancy and training on parasites and diseases important to the fishing industry. The center was established by FIRTA in 1977. During the life of FIRC 1981-020 many industry problems were successfully...
ORGANISATION:
University of Queensland (UQ)

Selective breeding for disease resistance and fast growth in Sydney rock oysters

Project number: 1996-357
Project Status:
Completed
Budget expenditure: $332,308.00
Principal Investigator: John Nell
Organisation: Department of Primary Industries and Regional Development (NSW)
Project start/end date: 27 Feb 1997 - 18 Mar 2004
Contact:
FRDC

Need

The NSW oyster industry has suffered from QX disease and winter mortality for a very long time. It has responded to these disease challenges by vacating affected leases seasonally or in the case of Georges River by abondoning the infested part of the estuary. The history of inter-estuary transfer of oysters for on-growing has not allowed the development of resistant strains in NSW. However, if resistant strains of oysters are not developed, the industry will have no better management tool available in future than that used in the past, ie moving or selling oysters before a disease outbreak is expected or abondoning oyster leases.

If the opportunity for breeding QX disease resistance in Sydney rock oysters is not taken up, a unique opportunity will be lost, to use breeding lines previously selected for fast growth in the selection for disease resistance. It is important that breeding for QX resistance begins now, before another estuary is infested with this parasite. In Georges River, the industry responded to the QX outbreak by abandoning affected leases.

Growth rates in Sydney rock oysters have been improved by an average of 4% for the first generation of selection in Port Stephens. Now the initial progress has been made and four breeding lines are established, it is important that the momentum is maintained and selective breeding for fast growth is continued. The growth rate of the Port Stephens selection lines can be increased by 4% for each successive generation.

Growth rates in Sydney rock oysters can be improved by both selective breeding (an average of 4% faster growth for the first generation of selection) and triploidy (30-40% faster growth). However, triploids have not previously been produced from improved breeding lines. It is important to determine if improvements in growth rates by these two methods are additive. For example with triploids produced from improved breeding lines, a 30% increase in growth rate with triploidy plus another 8% for two generations of selective breeding may increase growth rates of oysters by 38%.

Objectives

1. Evaluation of the resistance of fourth selected generation Georges River oysters to QX disease and winter mortality against controls
2. Evaluation of the growth rate of fourth selected generation Port Stephens selection line diploids and triploids against non-selected diploid and triploid controls
Adoption
PROJECT NUMBER • 2002-643
PROJECT STATUS:
COMPLETED

Aquatic Animal Health Subprogram: viral encephalopathy and retinopathy, a disease strategy manual

The disease strategy manual for VER reviews the relevant scientific literature on an economically important aquatic viral disease. A description of the disease with special emphasis on Australian fin fish species reveals significant disease in farmed barramundi and significant potential for disease...
ORGANISATION:
IDEXX/VPS
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