27,918 results
Environment
PROJECT NUMBER • 1993-086
PROJECT STATUS:
COMPLETED

Population dynamics of southern rock lobster in SA waters

This study looks at the population dynamics and fishery biology of the southern rock lobster, Jasus edwasrdsii, in South Australian waters. The four distinct areas of investigation are biological research to describe key population parameters; development of a comprehensive database of...
ORGANISATION:
South Australian Rock Lobster Advisory Council (SARLAC)
TAGS
Wild Catch
Tagging
Reproduction
Population Dynamics
Mortality
Industry

The impact of changes in fishing patterns on red-legged banana prawns (Penaeus indicus) in the Joseph Bonaparte Gulf

Project number: 1995-016
Project Status:
Completed
Budget expenditure: $85,164.00
Principal Investigator: Neil Loneragan
Organisation: CSIRO Oceans and Atmosphere Hobart
Project start/end date: 28 Jun 1995 - 30 Jun 1997
Contact:
FRDC
TAGS
Stock Assessment
Resource Access And Allocation
Fishing Effort
Fisheries Management
Economic

Objectives

1. To contribute to maximise the economic yield of the red-legged banana prawn fishery in the Joseph Bonaparte Gulf by:
2. developing a model incorporating growth mortality and value at size parameters that can evaluate, under different fishing patterns, the economic returns to the fishery
3. evaluating the effects of different fishing patterns on the spawning capacity of the stock

Final report

Author: Neil Loneragan and David Die
Final Report • 1997-03-11 • 1.09 MB
1995-016-DLD.pdf

Summary

The fishery for red-legged banana prawns in the Joseph Bonaparte Gulf (JBG) developed in the early 1980s. Since then, fishing effort has varied from 700 to 2600 boat-days per year and catches range from 200 to 1000 tonnes per year. Initially the JBG fishery developed as an alternative to fishing in the Gulf of Carpentaria: during years of poor catches in the Gulf of Carpentaria, more fishing effort was applied in the JBG. In the early years most effort was concentrated at the end of the year. In recent years, however, in addition to being more heavily fished in years of poor catches elsewhere, JBG stocks are fished earlier in the season by a consistent number of boats, regardless of catches elsewhere in the NPF.
 
Although the red-legged banana prawn has been fished in the JBG since the early 1980s, we know little of its biology or population dynamics. Apart from a 12-month study by Northern Territory (NT) Fisheries in 1990, there has been no research on this species in Australia. The NT findings suggested that growth and mortality rates - important parameters for estimating the effects of changes in fishing effort on stocks - could not be estimated precisely by length frequency analysis of data from commercial catches. There was a need to develop a preliminary model for the red-­legged banana prawn fishery in the JBG. This model would help to evaluate the impacts of changes in the pattern of fishing effort on the yield and spawning biomass of red-legged banana prawns. However, the estimates of growth and mortality used by the model would, unfortunately, be imprecise.
 
Therefore, a well-designed tag/release study would significantly improve the reliability of our estimates of growth and mortality for red-legged banana prawns in the JBG. However, prior to conducting a large-scale field tagging trial, the effect of tagging on the growth and mortality of red-legged banana prawns needed to be studied. For tag/release experiments to be successful, tagging should not affect the growth and survival of the prawns. An effective release-cage also needed to be designed for the deep waters of the JBG.
Environment
PROJECT NUMBER • 1998-150
PROJECT STATUS:
COMPLETED

Development and assessment of methods to reduce the predation of pot-caught southern rock lobster (Jasus edwardsii) by maori octopus (Octopus maorum)

The SARLF is the State’s most valuable wild fishery with estimated export earnings of >$100 million in 2002. The fishery is a closed entry fishery with 250 licence-holders and is divided into the Northern and Southern Zones. Lobsters are caught in baited pots that are generally set...
ORGANISATION:
University of Adelaide
TAGS
Mortality
SPECIES
Southern Rock Lobster
Octopuses
Adoption
Industry
PROJECT NUMBER • 2000-251
PROJECT STATUS:
COMPLETED

Rock Lobster Post Harvest Subprogram: development of a method for alleviating leg loss during post-harvest handling of rock lobsters

A novel brief application of cold-stunning was identified as a practical method for preventing post-harvest leg loss at several points in the post-harvest handling chain. Using this method, there is potential for the western rock lobster industry to save in excess of $2 million per season in lost...
ORGANISATION:
University of Western Australia (UWA)
TAGS
Post Harvest
Mortality
Husbandry
Aquaculture
Animal Health
SPECIES
Western Rock Lobster
Southern Rock Lobster
Industry
Industry
Industry
PROJECT NUMBER • 2011-771
PROJECT STATUS:
COMPLETED

Seafood CRC: genetic selection for Amoebic Gill Disease (AGD) resilience in the Tasmanian Atlantic salmon (Salmo salar) breeding program

Amoebic gill disease (AGD) continues to have a significant economic impact upon production of sea-farmed Atlantic salmon in Tasmania. Reducing mortality is economically important for the fish farmer and is equally important from an animal welfare perspective. The process of freshwater bathing...
ORGANISATION:
CSIRO Oceans and Atmosphere Hobart
TAGS
Toxin
Oceanography
Mortality
Modelling
Harvest Strategy
SPECIES
Atlantic Salmon
Environment
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