PROJECT NUMBER
•
1997-207
PROJECT STATUS:
COMPLETED
ORGANISATION:
NSW Department of Primary Industries
86 results
PROJECT NUMBER
•
1997-205
PROJECT STATUS:
COMPLETED
ORGANISATION:
CSIRO Oceans and Atmosphere Hobart
PROJECT NUMBER
•
1997-204
PROJECT STATUS:
COMPLETED
ORGANISATION:
University of Wollongong (UOW)
Developing indicators of recruitment and effective spawner stock levels in north Queensland east coast prawn stocks
Project number:
1997-146
Project Status:
Completed
Budget expenditure:
$154,654.00
Principal Investigator:
Clive Turnbull
Organisation:
Department of Agriculture and Fisheries EcoScience Precinct
Project start/end date:
9 Aug 1997
-
15 Mar 2006
Contact:
FRDC
SPECIES
In order to establish stock status, supply accurate advice and recommendations on management and monitor effectiveness of management intervention if need be, there is a need to develop procedures which
a) allow definition of the relationship between parent stock and recruitment levels in commercial prawn species, using fishery independant surveys as a means of determining recruitment levels
b) determine the status of these species and evaluate the potential risk of overfishing
c) develop methods which can used to evaluate the effectiveness of management intervention, if and when such intervention occurs.
1. To develop fishery independent sampling procedures that can be used as robust long term methods for monitoring recruitment levels in the tiger and endeavour prawn fisheries located along the northern Queensland east coast and in Torres Strait.
2. To obtain a series of (fishery dependent) indices of spawner biomass and (fishery independent) indices of recruitment which can be used to generate a long term data series.
3. Incorporation of the indices obtained in objective 2 into a stock - recruitment curve, an index of stock sustainability and an assessment of the risk of recruitment overfishing facing each of the species.
Final report
PROJECT NUMBER
•
1997-145
PROJECT STATUS:
COMPLETED
ORGANISATION:
Department of Agriculture and Fisheries EcoScience Precinct
SPECIES
Definition of effective spawning stocks of commercial tiger prawns in the NPF and king prawns in the eastern king prawn fishery: behaviour of post-larval prawns
Project number:
1997-108
Project Status:
Completed
Budget expenditure:
$334,756.00
Principal Investigator:
David Vance
Organisation:
CSIRO Oceans and Atmosphere Hobart
Project start/end date:
22 Jun 1997
-
12 Nov 2001
Contact:
FRDC
SPECIES
In the Northern Prawn Fishery and the East Coast King Prawn Fishery managers have concerns about declining levels of recruitment to the fishery, and the lack of knowledge of the relationship between spawning stock and recruitment to the fishery. In both fisheries, the increase in effective fishing effort due to the use of GPS plotters and other modern technologies means that measures will inevitably have to be taken to reduce effort in the future. A more accurate definition of the real spawning stock would allow management to more effectively protect spawning stock and maximize catches by ensuring that critical areas were not overfished while allowing fishing in non-critical areas. Clear identification of the critical spawning areas would also allow managers to determine if changes in annual recruitment were due to changes in levels of spawning stocks.
The CSIRO hydrodynamic model of Albatross Bay (and models being developed for the entire Gulf of Carpentaria) have the potential to allow managers to more accurately define the effective spawning stocks for tiger prawns, but are limited by our lack of knowledge of a critical piece of postlarval behaviour: the timing of the change in vertical migration behaviour from being day-night cued to tidally cued.
The research proposed for eastern king prawns is particularly important, not only because it provides information relevant to improving the management of the East Coast King Prawn Fishery, but also because it will allow us to validate the techniques used in obtaining the behavioural data on tiger prawns for the Northern Prawn Fishery (see Methods).
1. Measure the critical vertical migration behaviour of postlarval tiger and king prawns that determines their inshore advection patterns.
2. Incorporate this behaviour into hydrodynamic models to accurately estimate the effective spawning stocks of tiger and king prawns.
Final report
ISBN:
1-876996-03-X
Author:
David Vance
Final Report
•
2001-10-05
•
1.90 MB
1997-108-DLD.pdf
To effectively manage most fisheries, including penaeid prawn fisheries in northern and eastern Australia, it is important to know the relationship between the size of the spawning population and the number of young adults that recruit to a fishery in the next generation. In the tiger prawn fishery in the Gulf of Carpentaria, it has been assumed for management purposes that the total adult population at a particular time is the effective spawning stock, i.e. all spawners contribute to the next generation's stock. This is not necessarily correct and is particularly unlikely for many species of penaeid prawns, whose larvae and postlarvae have to migrate from offshore spawning areas to coastal and estuarine nursery areas. The area that contains spawners that actually contribute offspring to subsequent adult populations has been termed the effective spawning area.
The main aim of our project was to investigate the vertical migration behaviour of postlarval penaeid prawns that enables them to recruit from offshore spawning areas to the coastal nursery areas. We used two strategies to achieve this aim: field sampling in estuaries in southern and northern Queensland and laboratory experiments.
Keywords: Effective spawning, prawns, postlarvae, behavior, vertical migration.
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