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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on January 15, 2008
ICES Journal of Marine Science: Journal du Conseil 2008 65(2):140-147; doi:10.1093/icesjms/fsm186
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© 2008 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Distributions of young cephalopods in the tropical waters of Western Australia over two consecutive summers

George D. Jackson1,, Mark G. Meekan2, Simon Wotherspoon3 and Christine H. Jackson1

1 Institute of Antarctic and Southern Ocean Studies, University of Tasmania, Private Bag 77, Hobart, Tasmania 7001, Australia
2 Australian Institute of Marine Science, Darwin Office, PO Box 40197, Casuarina MC, Northern Territory 0811, Australia
3 School of Maths and Physics, University of Tasmania, Private Bag 37, 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

Jackson, G. D., Meekan, M. G., Wotherspoon, S., and Jackson, C. H. 2008. Distributions of young cephalopods in the tropical waters of Western Australia over two consecutive summers. – ICES Journal of Marine Science, 65: 140–147.

Cephalopod paralarvae and juveniles were sampled with light traps deployed at the surface and deeper in the southern NW Shelf and on Ningaloo Reef off Western Australia during two consecutive summers. One cross shelf transect (Exmouth) was sampled in the late spring and summers of 1997/1998 (summer 1) and 1998/1999 (summer 2), and a second cross shelf transect (Thevenard) and a longshore transect (Ningaloo) along the Ningaloo Reef were sampled in summer 2. Species captured in the order of abundance were octopods, Photololigo sp., Sepioteuthis lessoniana, and Sthenoteuthis oualaniensis. Most were captured in shallow traps except for Photololigo sp., which was common in both shallow and deep traps with larger animals found in deeper water. The presence of Idiosepius pygmaeus in deep water off Ningaloo Reef revealed the species to be eurytopic, inhabiting a wider range of habitats than previously known. Photololigo sp. and S. lessoniana were more abundant inshore, and octopods were especially abundant on mid-depth stations of the Exmouth transect, probably because of the turbulent mixing and increased productivity there. Fewer S. oualaniensis were caught during the first summer on the Ningaloo transect (n = 5) than during the second summer (n = 79).

Keywords: cephalopods, light traps, Ningaloo, squid

Received 8 June 2007; accepted 24 November 2007; advance access publication 15 January 2008.


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