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Rapid changes in life-history characteristics of a long-lived temperate reef fish


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Ziegler, PE, Lyle, JM, Haddon, M and Ewing, GP 2007 , 'Rapid changes in life-history characteristics of a long-lived temperate reef fish' , Marine and Freshwater Research, vol. 58, no. 12 , pp. 1096-1107 , doi: 10.1071/MF07137.

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Banded morwong, Cheilodactylus spectabilis, a long-lived sedentary temperate reef fish, has undergone rapid
changes in its growth and maturity characteristics along the east coast of Tasmania, Australia. Over a period of 10 years,
growth of young males and females has consistently accelerated, such that in 2005, 3-year-old fish were up to 40 mm or
13% longer compared with 1996, and age at 50% maturity for females had declined from 4 to 3 years. The magnitude
and speed of the observed changes were unexpected given the species’ longevity (maximum age of over 95 years). The
underlying mechanisms for the changes remain unclear but density-dependent responses to changes in population size and
age composition, possibly mediated through reduced competition for shelter and intra-specific interactions, may have been
contributing factors. Increasing sea surface temperatures over part of the period of change does not appear to have been a
major driver and a genetic response to fishing seems unlikely. Notwithstanding any uncertainty, C. spectabilis populations
have become more productive in recent years, challenging the general approach towards stock assessmentwhere life-history
characteristics are assumed to remain stable across contrasting levels of stock abundance and environmental conditions.

Item Type: Article
Authors/Creators:Ziegler, PE and Lyle, JM and Haddon, M and Ewing, GP
Journal or Publication Title: Marine and Freshwater Research
ISSN: 1323-1650
DOI / ID Number: 10.1071/MF07137
Additional Information:

Copyright © 2007 CSIRO.

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