12 results
Industry
PROJECT NUMBER • 1987-069
PROJECT STATUS:
COMPLETED

Development of alternative fishing practices for the harvesting of wild and re-seeded scallop beds in Tasmania

OBJECTIVES: a. To determine the efficiency of Beam, Triple and Prawn trawling methods for the harvesting of scatlops. b. To investigate the difference in efficiency between the sputnik dredge and the Japanese Keta-ami dredge. c. To investigate the difference in bottom damage between the sputnik and...
ORGANISATION:
Department of Natural Resources and Environment Tasmania (NRE TAS)

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
:

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.

Environment

Development of inshore ring netting techniques for the capture of squid and jack mackerel

Project number: 1984-101
Project Status:
Completed
Budget expenditure: $0.00
Principal Investigator: Maria Casimaty
Organisation: Department of Natural Resources and Environment Tasmania (NRE TAS)
Project start/end date: 27 Jun 1985 - 29 Jun 1985
:

Objectives

1. Assess commercial viability of inshore ring net fishery - squid & mackerel
2. (part of major TFDA project to develop commercial viability catching technique for arrow squid, inshore & in Bass Strait).
Environment
PROJECT NUMBER • 1995-066
PROJECT STATUS:
COMPLETED

Assessment of optimal trapping techniques to control densities of northern Pacific seastars on marine farm leases

The principal aims of this study were to evaluate whether the locally­ produced Whayman-Holdsworth trap provides an effective method for minimising Asterias amurensis infestations on shellfish farms, and to objectively assess the value of seastar traps when used in commercial applications. In an...
ORGANISATION:
Department of Natural Resources and Environment Tasmania (NRE TAS)
Environment

Feasibility study of the application of satellite remote sensing to fisheries investigations

Project number: 1980-015
Project Status:
Completed
Budget expenditure: $0.00
Principal Investigator: Thomson
Organisation: Department of Natural Resources and Environment Tasmania (NRE TAS)
Project start/end date: 28 Dec 1981 - 31 Dec 1981
:

Objectives

1. Assess utility of data remotely sensed by satellite in fisheries investigations. .
2. By using satellite data, characterise water masses associated with pelagic fish
3. Determine if real-time data can be obtained in future for dissemination to catching sector
Environment
PROJECT NUMBER • 1986-045
PROJECT STATUS:
COMPLETED

Assessment of demersal fish resources of the south western sector

Catch statistics for 13 species from commercial and research trawls conducted between 1979 and 1984 in the southern areas of the South-East Trawl fishery are examined. Catch and catch per swept area from demersal trawls were stratified by position, depth and month and shots were subsequently...
ORGANISATION:
Department of Natural Resources and Environment Tasmania (NRE TAS)

The development of an index for the prediction of catches of blacklip and greenlip abalone, and a technique for ageing these species

Project number: 1985-053
Project Status:
Completed
Budget expenditure: $0.00
Principal Investigator: Jeremy D. Prince
Organisation: Department of Natural Resources and Environment Tasmania (NRE TAS)
Project start/end date: 28 Dec 1988 - 31 Dec 1988
:

Objectives

1. Examine possibility of using density of newly settled abalone as index of future stock abundance.
2. Use temporal & spatial variation of this index to examine relationship between fishing pressure, spawning stock & future stock abundance.
3. Method of stock .. see Remarks

Final report

Author: JD Prince W Nash T L Sellers S Talbot W B Ford
Final Report • 2011-08-01 • 16.48 MB
1985-053-DLD.pdf

Summary

The scientific literature has generally accepted that abalone populations are characterised by low levels of settlement and recruitment (Tegner in press), that mortality is relatively low (Doi et al. 1977; Beinssen and Powell 1979; Sainsbury 1982; Shepherd et al. 1982; Fournier and Breen 1983) and uniform throughout life (Shepherd et al. 1982), and correspondingly that the natural productivity of these stocks is low (Tegner in press). In some studies it has been noted that one or more year classes are apparently missing (Forster et al. 1982; Sainsbury 1982) and this has led to the conclusion that abalone recruitment is relatively sporadic and irregular. It has been generally assumed that larval dispersal is relatively widespread (20-50km; Tegner & Butler 1985). No relationship had been observed between the abundance of breeding stock and the abundance of recruitment. On the basis of these observations and laboratory studies, together with genera lly held assumptions, it has been accepted that oceanographic and other environmental factors would be the major determinants of settlement and recruitment density (Fedorenko & Spout 1982; Tegner in press).

It was these widely held views which led to the original rationale for this project, which was to develop an index of settlement or recruitment abundance which could be used to predict broad scale trends in the future abundance of the fishable stock.

In addition, there was also no scientifically proven method of ageing abalone prior to this study, and it was generally accepted that the Australian species of abalone could not be aged. The FIRTA-funded review of Ward (1986) found that this was a major impediment of research into and assessment of abalone stocks in Australia.

Environment
PROJECT NUMBER • 2016-118
PROJECT STATUS:
COMPLETED

Using scat DNA to inform sustainable fisheries management and Ecological Risk Assessments: a Shy Albatross case study

Seabirds are attracted to fishing vessels through the availability of fishery discards, increasing the risk of injury or mortality from interactions with fishing gear. However, it is difficult to estimate what proportion of the population may be at risk. We use DNA metabarcoding of scats to...
ORGANISATION:
Department of Natural Resources and Environment Tasmania (NRE TAS)
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