31 results

Tactical Research Fund: optimisation of treatment of Ichthyophthirius multifiliis in farmed trout

Project number: 2011-255
Project Status:
Completed
Budget expenditure: $61,141.00
Principal Investigator: Marty R. Deveney
Organisation: SARDI Food Safety and Innovation
Project start/end date: 30 Apr 2012 - 15 Nov 2013
Contact:
FRDC

Need

Massive losses of farmed trout and native fish occurred due to Ichthyophthirius multifilis in 2012. The losses have not only had substantial impacts on commercial aquaculture operations and limited the availability of trout and native fish for the public water stocking programs of the Victorian and New South Wales governments. The timing of this work is critical, to develop and implement with key farmers new health management methods and reduce mortalities before next summer.

Ichthyophthirius multifilis has a direct lifecycle with an adult in the cells of the fish’s surface and asexual reproduction in the environment. In aquaculture systems heavy infections develop rapidly. A previous project DPI Victoria-funded project identified I. multifilis as the highest priority health issue in the Victorian trout industry and developed permits for access to new treatments for trout and other freshwater finfish aquaculture industries.

Treatment for I. multifilis centres on husbandry and strategic chemical control, but treatment dose and timing have not been optimised. Treatments include formalin, chloramine-T, or hydrogen peroxide, which are applied to the water. These products target only the environmental life cycle stages. Strategic treatment aims to kill all environmental stages, with a second dose to kill newly emerged stages after the previous treatment. The relationship between parasite lifecycle, temperature, parasite strain and water quality is currently unknown.

Growers assume that the dose is the same as the concentration applied to the system, but concentrations of these compounds are altered by water quality. This reduces efficacy and can make approved label doses ineffective. Treatments are also stressful to fish; treatments can cause substantial gill damage. Strategies for managing dose to balance efficacy and optimum fish performance need to be developed.

Better management of I. multifilis will decrease mortality, increase growth and quality and decrease husbandry costs in affected industries.

Objectives

1. Understanding lifecycle parameters in identified Australian strains of I. multifilis
2. Using lifecycle information to inform treatment timing
3. Optimising doses of relevant veterinary products under different environmental conditions
4. Assess relationships between product exposure and impacts on skin and gills of treated fish
Industry
PROJECT NUMBER • 2015-229
PROJECT STATUS:
COMPLETED

Oysters Australia IPA -workshop – identifying knowledge gaps for development of the native oyster aquaculture industry in South Australia

The 2015-229 “Oysters Australia IPA - workshop - identifying knowledge gaps for development of the native oyster aquaculture industry in South Australia” brought together oyster farmers, hatchery operators and scientists from across Australia to share their knowledge and experience with native...
ORGANISATION:
SARDI Food Safety and Innovation
Industry
PROJECT NUMBER • 2003-229
PROJECT STATUS:
COMPLETED

Identification and management of potential food safety issues in aquaculture-produced yellowtail kingfish (Seriola lalandi)

Hazards such as dioxin (PCDD/F) and PCBs have been identified in manufactured feeds as priorities for further investigation by industry. These issues are now being discussed by the South Australian Marine Finfish Farmers Association Inc (SAMFFA) and Australian feed manufacturers as part of...
ORGANISATION:
SARDI Food Safety and Innovation
People
PROJECT NUMBER • 2001-252
PROJECT STATUS:
COMPLETED

Aquafin CRC - SBT Aquaculture Subprogram: infrastructure management, service delivery and technical support

The project provided scientific and technical support to research projects involving live Southern Bluefin Tuna (SBT) under controlled conditions. These were primarily conducted by the Aquafin CRC and FRDC and managed through the SBT Aquaculture Subprogram. Four experiments were undertaken in...
ORGANISATION:
SARDI Food Safety and Innovation
Environment
PROJECT NUMBER • 2005-061
PROJECT STATUS:
COMPLETED

Gear interaction of non-targeted species in the Lakes and Coorong commercial and recreational fisheries of South Australia

This project was developed by SARDI, in consultation with PIRSA, Lakes and Coorong Fishery (LCF) licence holders and relevant stakeholders, over several years. Proposals to investigate interactions with non-target species and discarding from the LCF in the Murray River estuary and Coorong...
ORGANISATION:
SARDI Food Safety and Innovation
Industry
PROJECT NUMBER • 1997-361
PROJECT STATUS:
COMPLETED

Southern Bluefin Tuna Aquaculture Subprogram Project 1: implementation and coordination of research experiments conducted with farmed southern bluefin tuna to assess manufactured diets, feeding regimes and harvesting techniques

The Southern Bluefin Tuna (SBT), Thunnus maccoyii, Aquaculture Industry has undergone rapid expansion since it commenced in 1990. In 2002/03 the industry was Australia’s third largest export fishing industry (ABARE, 2002) with most of its value coming from aquaculture. In this year the...
ORGANISATION:
SARDI Food Safety and Innovation
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