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Interannual variability in the early growth rate and size of the Antarctic fish Gobionotothen gibberifrons (Lönnberg)

Published online by Cambridge University Press:  07 May 2004

A. W. North
Affiliation:
British Antarctic Survey, Natural Environmental Research Council, High Cross, Madingley Road, Cambridge, CB3 OET, UK, Email: a.north@bas.ac.uk
M. G. White
Affiliation:
British Antarctic Survey, Natural Environmental Research Council, High Cross, Madingley Road, Cambridge, CB3 OET, UK, Email: a.north@bas.ac.uk
P. N. Trathan
Affiliation:
British Antarctic Survey, Natural Environmental Research Council, High Cross, Madingley Road, Cambridge, CB3 OET, UK, Email: a.north@bas.ac.uk

Abstract

Gobionotothen gibberifrons <1 year old, of the 1977, 1980, 1981, 1985, 1986, 1990 and 1995 cohorts, were sampled using nets, in various periods during summer (December to February) at South Georgia. Growth in standard length (Ls) was estimated using the exponential model. Among the seven cohorts, average growth rate varied between 0.33–2.1% Lsd−1, and predicted Ls for mid-January varied between 21.6–29.1 mm. Average growth rate was inversely related to mean date of sampling but was not significantly related to mean Ls. Mean sea surface temperatures were available for the 1981–95 cohorts. Average growth rate and predicted Ls for mid-January were both negatively conelated with mean December–January sea temperature, but were not significantly related to mean weekly sea surface temperature during the sampling periods. Greater average growth rate and greater Ls in cooler summers may be partly due to a large-scale pattern of environmental variability, indicated by sea temperature, that governs the timing and magnitude of the production cycle and food availability.

Type
Papers—Life Sciences and Oceanography
Copyright
© Antarctic Science Ltd 1998

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Interannual variability in the early growth rate and size of the Antarctic fish Gobionotothen gibberifrons (Lönnberg)
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