17 results
Industry
Industry
PROJECT NUMBER • 2015-213
PROJECT STATUS:
COMPLETED

Enabling land-based production of juvenile Yellowtail Kingfish in NSW

NSW DPI conducted a series of experiments and commercial-scale production to investigate the viability of producing advanced juvenile yellowtail kingfish (YTK, Seriola lalandi) at the Port Stephens Fisheries Institute (PSFI) during March 2016 - December 2018. There is a significant shortfall of...
ORGANISATION:
Department of Primary Industries and Regional Development (NSW)
Environment
Adoption
PROJECT NUMBER • 2012-504
PROJECT STATUS:
COMPLETED

Tactical Research Fund: industry-extension of acoustic release technology for at-call access to submerged head-gear in the NSW rocklobster fishery

Acoustic release systems were purchased by 3 fishing businesses but installation proceeded for only 2 of these businesses, on vessels fishing out of Sydney and Jervis Bay. Installation on the vessel Seeking, working out of Jervis Bay, was a permanent installation, with full integration...
ORGANISATION:
Department of Primary Industries and Regional Development (NSW)

Evaluation of nanobubble technology in aquaculture

Project number: 2019-139
Project Status:
Completed
Budget expenditure: $294,869.00
Principal Investigator: Igor Pirozzi
Organisation: Department of Primary Industries and Regional Development (NSW)
Project start/end date: 30 Jun 2021 - 29 Jun 2023
Contact:
FRDC

Need

In intensive aquaculture systems oxygen supplementation is necessary to prevent hypoxia; however, oversupply can hyper-saturate systems causing gas bubble disease. Oxygenation in aquaculture, fish holding and transport systems using standard technologies is extremely inefficient; standard oxygen transfer efficiencies (SOTE) are estimated at between 2 and 6% per m submergence for coarse and fine bubble diffusers, respectively, at standard conditions of 0 ppt salinity and 20 °C. Advances in the efficiency of gas–liquid phase processes has seen the emergence of nanobubble technologies producing ultrafine bubbles (⌀ 1 µm). The advantage of nanobubbles over larger micro/macrobubbles is that they are neutrally buoyant, negatively charged and can remain within the water column, potentially for weeks. Nanobubble technologies now have a demonstrated application across a broad variety of industries including wastewater treatment, biomedical engineering, gas and oil industry, agriculture, and the food industry. Surprisingly, outside of Japan, there has been little research on the application of nanobubble technology to the aquaculture sector. Nanobubble technology can potentially improve oxygen delivery systems for fish stock and water treatment in aquaculture systems, improving the nitrifying capacity of biofilters and efficiencies in fractionation units. However, there are currently no reliable studies demonstrating the efficacy of nanobubble technology, nor any assessment of the potential health impacts on fish in aquaculture systems. We have undertaken a preliminary pilot trial with encouraging results. Oxygenation was applied to a recirculating aquaculture system via nanobubble injectors for 10 days and fish (yellowtail kingfish) were observed to feed and behave normally when compared to a control group. Before this technology can be considered for broader adoption, a thorough long term investigation needs to be undertaken to assess the long term health effects on fish stock held in nanobubble oxygenated water and the suitability for application of this technology to the aquaculture industry.

Objectives

1. To demonstrate the efficacy of nanobubble technology for use in finfish aquaculture by:i) assessing the health, growth and feed conversion efficiencies of fish cultured in a recirculating aquaculture system at different temperatures, salinities and stocking densities exposed to nanobubblesii) determining the effect of nanobubble oxygenation on waste water treatment efficiencies in a recirculating aquaculture system.iii) providing a preliminary cost benefit analysis on the implementation of nanobubble aeration to an aquaculture system

Final report

Author: Igor Pirozzi
Final Report • 2025-02-21 • 2.76 MB
2019-039-DLD.pdf

Summary

Nanobubble (NB) technology, i.e. the production of ultrafine bubbles with diameters <1 µm, is an emerging field which has the potential to greatly improve oxygenation efficiencies in aquaculture production. Before this technology can be considered for adoption by the aquaculture industry, a thorough assessment of the health and growth effects on fish stock held in NB oxygenated water is required. Three trials were conducted to compare NB technology with conventional oxygenation setup (ceramic diffusers and air stones, oxygen gas and air) in a recirculating aquaculture system (RAS) under a number of different aquaculture scenarios testing i) stocking density, ii) salinity, and iii) temperature. 
Industry
PROJECT NUMBER • 1998-360
PROJECT STATUS:
COMPLETED

Waterproof labelling and identification systems suitable for shellfish and other seafood products

This report outlines the results of investigations into the feasibility of cost effectively marking or labelling individual oysters and other shellfish for product differentiation and to facilitate rapid and efficient recall of product in the event of a potential public health incident. A number of...
ORGANISATION:
Department of Primary Industries and Regional Development (NSW)
Industry
PROJECT NUMBER • 1981-069
PROJECT STATUS:
COMPLETED

Clarence River pilot prawn farming project

The research programme was largely comprised of farming trials in a 1 ha prawn farming pond and in swimming pools on the pond bank at the field site. Juvenile school prawns (Metapenaeus macleayi) were collected by commercial trawlers in Lake Wolloweyah, transported by punt to the pond where they...
ORGANISATION:
Department of Primary Industries and Regional Development (NSW)
Environment
PROJECT NUMBER • 1994-042
PROJECT STATUS:
COMPLETED

Sampling estuarine fish species for stock assessments

Estuarine fishes in NSW are exploited by commercial and recreational fishers and are subject to significant pressure from habitat degradation. The NSW commercial estuarine finfish fishery is highly complex as it is based on multi-species and many fishers using variety of methods. Furthermore, there...
ORGANISATION:
Department of Primary Industries and Regional Development (NSW)
Industry
PROJECT NUMBER • 1989-078
PROJECT STATUS:
COMPLETED

Improving prawn hatchery production by reducing losses due to bacterial disease

Bacterial necrosis was the only bacterial disease syndrome seen during monitoring of 8 larval production runs at 2 commercial hatcheries during the study. Results indicated a possible causal relationship between concentrations of one or more components of the "presumptive Vibrio" populations in...
ORGANISATION:
Department of Primary Industries and Regional Development (NSW)
Environment
PROJECT NUMBER • 2007-038
PROJECT STATUS:
COMPLETED

Study of ghost fishing in the NSW rock lobster fishery

This project concerns an assessment of the significance ghost fishing in the NSW Rock Lobster Fishery and potential modifications to fishing gears and practices that could minimise trap loss and consequent ghost fishing of the target species, Eastern Rock Lobster, Sagmariasus verreauxi. The...
ORGANISATION:
Department of Primary Industries and Regional Development (NSW)
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