6 results
Environment
Industry

Jack mackerel assessment in south-east Australian waters

Project number: 1988-039
Project Status:
Completed
Budget expenditure: $242,073.00
Principal Investigator: Howel Williams
Organisation: Department of Natural Resources and Environment Tasmania (NRE TAS)
Project start/end date: 28 Jun 1990 - 31 Aug 1992
Contact:
FRDC

Objectives

1. Develop indices of abundance to enable appropriate annual TACs to be set.
2. Describe and assess the potential for viability in jack mackerel stocks caused by environmental factors.
3. Collect data on the breeding behaviour and early life history.

An assessment of the orange roughy resources off the coast around Tasmania

Project number: 1987-065
Project Status:
Completed
Budget expenditure: $137,388.00
Principal Investigator: Jeremy Lyle
Organisation: Department of Natural Resources and Environment Tasmania (NRE TAS)
Project start/end date: 28 Jun 1990 - 31 Dec 1990
Contact:
FRDC

Objectives

1. Determine abundance orange roughy on continental slope (800-1200m deep) around Tas (occurrence, size, distribution of spawning & non-spawning aggregations).
2. Establish potential sustainable yield.
3. Study life history, population parameters. Determine distribution & abundance other commercially important spp same depth off Tas

Enhancement and monitoring of a developing sea urchin fishery

Project number: 1987-063
Project Status:
Completed
Budget expenditure: $0.00
Principal Investigator: Christine D. Crawford
Organisation: Department of Natural Resources and Environment Tasmania (NRE TAS)
Project start/end date: 27 Jun 2000 - 30 Jun 2000
Contact:
FRDC

Objectives

1. Obtain prelim estimates of basic population parameters required to manage the resource.
2. Develop techniques for ageing sea urchins.
3. Investigate ... effects of several spp of algal food & qty of food avail - & effects of different densities - on gonad colour, texture & volume

Resource monitoring of the jack mackerel purse seining fishery in south-eastern Australia

Project number: 1985-077
Project Status:
Completed
Budget expenditure: $0.00
Principal Investigator: Howel Williams
Organisation: Department of Natural Resources and Environment Tasmania (NRE TAS)
Project start/end date: 28 Dec 1988 - 31 Dec 1988
Contact:
FRDC

Objectives

1. Maintain log book system to monitor catch & effort. Shipboard measuring program for size & age composition of commercial catch. Determine a current age/length key, effective age of recruitment. Obtain estimates of total mortality ... fishing & natural faca

Final report

Author: Howel Williams Grant Pullen Gwiedo Kucerans Carl Waterworth
Final Report • 2011-08-01 • 5.17 MB
1985-077-DLD.pdf

Summary

This program has collected data on the development and performance of the fishery, as well as biological data relevant to assessment of the impact of fishing on the exploited population.

The development and operation of the fishing and processing sectors of the fishery are described as are the development and implementation of jack mackerel management in Tasmania.

Biological data presented for jack mackerel include size structure of catch, length-weight relationships, catch age structure and reproductive development Estimates for the Von Bertalanffy parameters L∞, K and t0 are resented. Problems encountered estimating mortality rates are discussed and preliminary estimates given.

The bycatch species redbait, Emmelichthys nitidus, and blue mackerel, Scomber australasicus, make up approximately 5% of the landed catch. Some biological information on these two species is also presented.

The discovery of several adult Peruvian jack mackerel Trachurus murphyi raises questions as to the importance of this species, if any, in the fishery. These samples constitute the most westerly reports of this species distribution.

The importance of inter-annual variability in this fishery is discussed with reference to examples in the short history of the fishery.

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