The in situ relationships between season of hatching, growth and condition in the southern calamary, Sepioteuthis australis
Gretta Pecl
+ Author Affiliations
- Author Affiliations
A School of Marine Biology and Aquaculture, James Cook University, Townsville, Queensland 4811, Australia.
B Present address: Marine Research Laboratories, Tasmanian Aquaculture and Fisheries Institute, University of Tasmania, Private bag 49, Tasmania 7001, Australia.
C Email: gretta.pecl@utas.edu.au
Marine and Freshwater Research 55(4) 429-438 https://doi.org/10.1071/MF03150
Submitted: 24 September 2003 Accepted: 23 March 2004 Published: 22 June 2004
Abstract
This paper examines seasonal patterns in growth and condition of Sepioteuthis australis from temperate waters of Tasmania, Australia. Growth was described by a power function and was fast for a temperate species, with an average rate over the lifetime of 4–5% BW day–1. Sepioteuthis australis is an annual species, however spawning and hatching of juveniles appears to occur all year round. Analysis of individual juvenile growth demonstrated a correlation between seasonally increasing temperatures and progressively faster growth. Season of hatching also had a clear effect on adult growth; summer-hatched individuals were larger at 170–190 days of age compared with winter-hatched individuals (1002 ± 98 g and 632 ± 27 g respectively). The length–mantle weight relationship of adults was also dependent on season of hatching, with individuals hatched in summer and spring having heavier mantles at a given length than those hatched in winter or autumn. Differential rates of growth or varying levels of condition, or perhaps both, may affect the survivorship of individuals. Growth, condition and potentially lifespan of S. australis are dependent on environmental factors, with the dynamic nature of oceanographical conditions on the east coast of Tasmania resulting in a highly variable and fluctuating population structure.
Extra keywords: environment, growth plasticity, life-history, population structure, temperature.
Acknowledgments
This work was supported by a grant from Marine Research Laboratories (MRL), Tasmania, a James Cook University (JCU) Merit Research Grant (George Jackson and GP), and a JCU Collaborative Grant (GJ and GP). Thank you to J. Semmens, A. Jordan, R. Thomas, R. Green, S. Riley, C. Jackson and particularly N. Moltschaniwskyj for assistance at various stages of this project. G. Jackson aged some of the individuals and provided assistance in the field. Debbie Gardner and Alan Beech from MRL, Tasmania provided the known-age cultured individuals. Thank you to Tasmanian squid fishers for their extensive cooperation: D. Rosenthal, A. Hallam, T. Francis, J. McGee, S. Masters and B. Smedley. Anonymous reviewers provided constructive criticism that substantially improved the final manuscript. This research was conducted while the author was at JCU, supported by an Australian Postgraduate Award from the Commonwealth Government of Australia.
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