9 results
Industry
Environment
PROJECT NUMBER • 1998-215
PROJECT STATUS:
COMPLETED

Coastal floodplain management in eastern Australia: barriers to fish and invertebrate recruitment in acid sulphate soil catchments

Estuarine habitats, and in particular coastal floodplains and wetlands, provide essential nursery habitat for a large number of fish and prawn species, many of which are commercially and recreationally significant. Human activities on coastal land, such as those associated with grazing and...
ORGANISATION:
Department of Primary Industries and Regional Development (NSW)
People
PROJECT NUMBER • 2002-661
PROJECT STATUS:
COMPLETED

Aquatic Animal Health Subprogram: enhancing the emergency disease response capability of NSW and Qld Government agencies and industry bodies associated with oyster culture

AQUAPLAN was generated as a National Strategic Plan for Aquatic Animal Health in recognition of the growing importance of protecting fisheries and aquaculture industries from disease. This project allowed NSW Fisheries to begin implementing one component of the National AQUAPLAN objectives,...
ORGANISATION:
Department of Primary Industries and Regional Development (NSW)
Environment
PROJECT NUMBER • 1985-074
PROJECT STATUS:
COMPLETED

The fisheries and biology of snapper, Chrysophrys auratus, in New South Wales

The snapper, Chrysophrys auratus, is an economically valuable common property resource that occurs in large numbers in New South Wales waters. Allegations of a resource decline in this major target species of both commercial and recreational fishermen have led to conflict over fishing access and...
ORGANISATION:
Department of Primary Industries and Regional Development (NSW)
Environment
PROJECT NUMBER • 1986-064
PROJECT STATUS:
COMPLETED

A preliminary assessment of the rock lobster fishery in New South Wales

The objectives of this study were to determine whether catch rates of rock lobsters in the commercial fishery off New South Wales were declining, the size and species composition of catches from the commercial fishery and to ascertain the smallest length at which 50% of female eastern rock lobsters,...
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 • 2016-200.20
PROJECT STATUS:
COMPLETED

Growing a profitable, innovative and collaborative Australian yellowtail kingfish aquaculture industry: Bringing white fish to the market - RnD4Profit-14-01-027

This project focused on growing the key existing Australian Yellowtail Kingfish (YTK) industry participants, as well as the industry as a whole, and directly addressed FRDC's strategic plan to build Australian sustainable aquaculture development through the activities of the new 'New and Emerging...
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)
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