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Are bigger calamary Sepioteuthis australis hatchlings more likely to survive? A study based on statolith dimensions


Steer, MA and Pecl, GT and Moltschaniwskyj, NA, Are bigger calamary Sepioteuthis australis hatchlings more likely to survive? A study based on statolith dimensions, Marine Ecology Progress Series, 261 pp. 175-182. ISSN 0171-8630 (2003) [Refereed Article]

DOI: doi:10.3354/meps261175


To determine whether any size-selective processes were operating throughout the life history of squid, this study set out to ascertain whether bigger hatchlings are more likely to survive to adulthood. This was achieved by comparing natal statolith dimensions between recently hatched (<13 h old) and successfully recruited adult Sepioteuthis australis. The squid statolith (analogous to the teleost otolith) retains a check associated with hatching, and the natal radius (NR) at hatching had a strong linear relationship to dorsal mantle length (ML). Hatchlings were collected using emergent traps from October 2001 to February 2002 on natural spawning grounds located on the east coast of Tasmania. Hatchling size was extremely variable ranging from 4.3 to 7. 3 mm (ML), with significantly larger squids hatching out in November and the smallest in February. From February to August, adults were collected from the same bay and aged using validated daily rings in the statolith and those adults estimated to have been born between October and February were included in the analysis. In all but 1 mo, a significant difference between the NR size distributions of the hatchlings and adults was detected due to low numbers of adults with small NRs. This indicated that smaller hatchlings were less likely to recruit, suggesting that there is an element of size-mediated mortality operating on populations of S. australis.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Zoology
Research Field:Invertebrate biology
Objective Division:Environmental Management
Objective Group:Marine systems and management
Objective Field:Marine biodiversity
UTAS Author:Steer, MA (Dr Michael Steer)
UTAS Author:Pecl, GT (Professor Gretta Pecl)
UTAS Author:Moltschaniwskyj, NA (Associate Professor Natalie Moltschaniwskyj)
ID Code:26933
Year Published:2003
Web of Science® Times Cited:35
Deposited By:TAFI - Aquaculture
Deposited On:2003-08-01
Last Modified:2011-10-28

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