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ICES Journal of Marine Science: Journal du Conseil 2003 60(2):290-296; doi:10.1016/S1054-3139(03)00007-9
© 2003 by ICES/CIEM International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer
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The dynamics of the summer-spawning population of the loliginid squid Sepioteuthis australis in Tasmania, Australia—a conveyor belt of recruits

George D Jacksona,* and Gretta Peclb

a Institute of Antarctic and Southern Ocean Studies, University of Tasmania PO Box 252-77, Hobart, Tasmania 7001, Australia
b Marine Research Laboratories, Tasmanian Aquaculture and Fisheries Institute, University of Tasmania Hobart, Tasmania 7001, Australia

*Correspondence to G. D. Jackson; tel: +61 3 6226 2975; fax: +61 3 6226 2973. e-mail: george.jackson{at}utas.edu.au; gretta.pecl{at}utas.edu.au.

The population dynamics of the loliginid squid Sepioteuthis australis was examined on a fine temporal scale during a 2-month period of rising sea-surface temperatures on the summer inshore spawning grounds of Coles Bay, Tasmania, Australia. Samples were taken regularly (generally weekly) to discern any short-term population changes in age, growth or reproductive parameters. There was no change in the mean age, mantle length or weight of males or females through the study period (November and December 1996). This indicated that instead of following one or a few discrete cohorts of spawning individuals, there were continuous waves of new individuals moving onto the spawning beds, which may be best described by a conveyer belt of new recruits. There was an abrupt and significant difference in the mean oviduct egg size in females caught between November and December but the factors responsible for this remain unknown. Few squid showed evidence of recent feeding, suggesting that they move off the spawning grounds to feed.

Keywords: squid spawning, reproduction, age, statoliths, loliginidae, cohorts, population dynamics

Received 8 July 2002; revision received 10 December 2002; accepted 11 December 2002.


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