43 results
Environment
PROJECT NUMBER • 1978-043
PROJECT STATUS:
COMPLETED

Abalone population dynamics studies and reef area estimation

Most Australian abalone fisheries are fully exploited and a comparison of the total catch of blacklip abalone, Haliotis ruber, in the three south-eastern states indicates a decline in population size from south to north. The catch distribution from New South Wales parallels that trend. This decline...
ORGANISATION:
Department of Primary Industries and Regional Development (NSW)
Industry
PROJECT NUMBER • 1985-075
PROJECT STATUS:
COMPLETED

Prawn farming pond management

The bioassay section of this study provides, for the first time, estimations of lethal and growth reducing concentrations for the major production-limiting water quality variables for P. monodon. These critical concentrations were assessed using comparable experimental facilities and procedures....
ORGANISATION:
Department of Primary Industries and Regional Development (NSW)
Environment
Environment
Environment
Environment

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

Project number: 1986-064
Project Status:
Completed
Budget expenditure: $0.00
Principal Investigator: Steven Montgomery
Organisation: Department of Primary Industries and Regional Development (NSW)
Project start/end date: 27 Jun 1989 - 29 Jun 1989
Contact:
FRDC

Objectives

1. Gather baseline catch information, incl population structure & present level of exploitation, on the major commercial spp.
2. Assess most suitable method for identifying stocks & investigating growth & mortality. Investigate reproductive biology of Jasus verrauxi.

Final report

Author: Steven S. Montgomery
Final Report • 1989-06-30 • 11.42 MB
1986-064-DLD.pdf

Summary

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, Jasus verreauxi carried eggs. In addition, experiments were done to assess the mortality in this species caused by tagging with different types of external tags.

Rock lobsters have been exploited off New South Wales since 1873. Reported annual landings averaged 122 tonnes per annum over the 10 year period to 1983-84 (latest year for which data are available from the NSW Agriculture & Fisheries Annual Reports). Based upon current prices at the point of first sale (Annual Reports of the Sydney Fish Marketing Authority), these average annual landings are worth $3 million per annum . In addition to this however, unreported landings are around 70% of those reported.Four species comprise the commercial catch namely; the eastern rock lobster Jasus verreauxi, the southern rock lobster Jasus novaehollandiae and the painted rock lobsters Panulirus longipes longipes and Panulirus ornatus. The eastern rock lobster comprises around 97% of annual landings in New South Wales.

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