Stock-recruitment relationships of the tiger prawns (Penaeus esculentus and Penaeus semisulcatus) in the Australian Northern Prawn Fishery

Wang, Y-G. & Die, D. (1996) Stock-recruitment relationships of the tiger prawns (Penaeus esculentus and Penaeus semisulcatus) in the Australian Northern Prawn Fishery. Marine and Freshwater Research, 47(1), pp. 87-95.

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Abstract

This paper investigates the stock-recruitment and equilibrium yield dynamics for the two species of tiger prawns (Penaeus esculentus and Penaeus semisulcatus) in Australia's most productive prawn fishery: the Northern Prawn Fishery. Commercial trawl logbooks for 1970-93 and research surveys are used to develop population models for these prawns. A population model that incorporates continuous recruitment is developed. Annual spawning stock and recruitment indices are then estimated from the population model. Spawning stock indices represent the abundance of female prawns that are likely to spawn; recruitment indices represent the abundance of all prawns less than a certain size. The relationships between spawning stock and subsequent recruitment (SRR), between recruitment and subsequent spawning stock (RSR), and between recruitment and commercial catch were estimated through maximum-likelihood models that incorporated autoregressive terms. Yield as a function of fishing effort was estimated by constraining to equilibrium the SRR and RSR. The resulting production model was then used to determine maximum sustainable yield (MSY) and its corresponding fishing effort (f(MSY)). Long-term yield estimates for the two tiger prawn species range between 3700 and 5300 t. The fishing effort at present is close to the level that should produce MSY for both species of tiger prawns. However, current landings, recruitment and spawning stock are below the equilibrium values predicted by the models. This may be because of uncertainty in the spawning stock-recruitment relationships, a change in carrying capacity, biased estimates of fishing effort, unreliable catch statistics, or simplistic assumptions about stock structure. Although our predictions of tiger prawn yields are uncertain, management will soon have to consider new measures to counteract the effects of future increases in fishing effort.

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ID Code: 90624
Item Type: Journal Article
Refereed: Yes
Additional Information: ISI Document Delivery No.: UB068
Times Cited: 44
Cited Reference Count: 32
Wang, YG Die, D
Workshop on Spawning Stock-Recruitment Relationships in Australian Crustacean Fisheries
Jun 01-03, 1994
Bribie island, australia
Fisheries Res & Dev Corp, Dept Ind Sci & Technol
C s i r o publications
Collingwood
Keywords: northwestern gulf, reproductive dynamics, western gulf, carpentaria, merguiensis, growth
DOI: 10.1071/mf9960087
ISSN: 1323-1650
Divisions: Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: © CSIRO 1996
Deposited On: 24 Nov 2015 04:16
Last Modified: 24 Nov 2015 04:16

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