The orientation and migratory dynamics of the western rock lobster, Panulirus cygnus, in Western Australia

Author:

de Lestang Simon1

Affiliation:

1. Western Australian Fisheries and Marine Research Laboratories, Department of Fisheries Western Australia, PO Box 20, North Beach, WA 6920, Australia

Abstract

Abstract Large-scale migrations are known to occur in numerous species, and in the case of the Western Rock Lobster, Panulirus cygnus, result in juveniles moving from nursery areas into deeper offshore breeding grounds. In 2008 the Western Rock Lobster fishery reduced harvest rates to increase legal and spawning biomass throughout the fishery, which also allowed greater numbers of lobsters to migrate. Increased lobster migration could potentially reduce biomass in some areas, thus adversely impacting commercial catch rates. Over 20 000 tag–recaptured lobsters were analysed to determine the dynamics underlying migration in this species and to assess the impact reduced harvest rates may have had on catches. This study showed that P. cygnus migration was associated with body size and water depth, and that magnetism and oceanic currents appear to be the most likely guideposts used for orientation. Size at migration varied in a constant fashion along the coast, being larger towards the southern end of the fishery and smallest at the offshore Abrolhos Islands. During the migration period, up to 50% of lobsters at their mean size of migration moved from coastal areas out towards deeper waters (>40 m), whereas <15% of those in deeper water at the same size moved significant distances northward. This behaviour appears to be contranatant, counteracting the downstream redistribution of larvae after their 9–11 month larval life. Reduced harvest rates and catches being focussed onto higher valued sedentary lobsters have allowed more lobsters to migrate. However, the numbers moving between management areas are relatively small, with the biological and economic benefits of fishing at a reduced exploitation rate outweighing losses to catches.

Publisher

Oxford University Press (OUP)

Subject

Ecology,Aquatic Science,Ecology, Evolution, Behavior and Systematics,Oceanography

Reference61 articles.

1. R package 'circular': Circular Statistics (version 0.43–);Agostinelli,2011

2. The potential for using acoustic tracking to monitor the movement of the West Coast rock lobster Jasus lalandii;Atkinson;African Journal of Marine Science,2005

3. True navigation and magnetic maps in spiny lobsters;Boles;Nature,2003

4. Teoria statistica delle classi e calcolo delle probabilitá;Bonferroni;Pubblicazioni del R Istituto Superiore di Scienze Economiche e Commerciali di Firenze,1936

5. Spiny Lobsters through the Eyes of the Giant Packhorse Lobster;Booth,2011

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