150 results
Environment
PROJECT NUMBER • 1984-020
PROJECT STATUS:
COMPLETED

The fishery for red spot king prawns (Penaeus longistylus) off the central Queensland coast

The fishery for king prawns which occurs between 18°S and 21°S has been investigated over a three year period. The fishery takes place predominantly during winter months. Availability of alternative target stocks as well as recruitment timing is responsible for the fishery's timing. Annual...
ORGANISATION:
Department of Primary Industries (QLD)

Port Phillip Bay and Bass Strait scallop research

Project number: 1983-032
Project Status:
Completed
Budget expenditure: $0.00
Organisation: Agriculture Victoria
Project start/end date: 28 Dec 1986 - 31 Dec 1986
:

Objectives

1. To define causes and extent of natural fluctuations in population numbers of scallops in Port Phillip Bay
2. determine effects of scallop dredging on aquatic biota of PP Bay
explore ways to optimise scallop yields from PP Bay

Final report

Author: D. Gwyther
Final Report • 1986-12-31 • 5.47 MB
1983-032-DLD.pdf

Summary

During the 3 years of the study, scallop spatfall was observed to occur over a short period (October-December) after the scallops had spawned in spring. Growth was rapid and scallops reached an acceptable harvestable size of 70mm within 16 months. Spatfall one year can therefore be related to recruitment during the next. Years of high and low spatfall were reflected in subsequent differences in recruitment. Though more years' data are required, indices of spatfall provide managers and fishermen with predictive information on likely recruitment strength one year in advance.

Each year the strength of recruitment and the residual stock size were estimated from the results of surveys by SCUBA divers. The results have shown that commercial viability of the fishery is primarily dependent upon recruitment each year. Residual stocks are normally insufficient to support the fishery in the event of poor recruitment.

Estimates of growth and mortality rates determined from tagging and data on seasonal changes in meat yield have been used to develop a mathematical model which can be used to determine number of scallops available each season and yields obtainable from different management strategies. Estimates from annual survey, of stock abundance and mean scallop size at the beginning of each year provide the data for the model.

As a result of the research program, the need to continue monitoring spatfall in Port Phillip Bay and to conduct surveys of recruitment strength each year has been identified. These data are necessary for fisheries managers to maintain the ability to manage the stocks by quota system.

Industry
PROJECT NUMBER • 2022-137
PROJECT STATUS:
COMPLETED

Ensuring market-focused value adding capabilities are available to SA Seafood companies today and through to 2030

Context Fresh premium seafood has long been the best pathway to a viable consumer. That remains true for premium SA wildcatch species (e.g., rock lobster, prawn, abalone) that are, and will continue to be, prosperous. But processing and value adding have never been more critical to attract retail...
ORGANISATION:
Ridge Partners
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