Precision in statolith derived age estimates among readers experienced in statolith age analysis was determined for both juvenile and adult individuals of the tropical loliginid squid Photololigo off Queensland, Australia. Juvenile age estimates were compared between two readers, while adult age estimates were compared among three readers. There was no reader effect in the age estimates of juveniles, but there was a trend of increasing age estimates with consecutive replicate counts for each reader. In the case of adult squid there was a statistically significant difference in age readings among readers, with the average greatest difference of 9.7 increments. However, this difference represented 5.6% of the lifespan of the oldest individual and 6.9% of the youngest aged adult. These differences were well within the 10% requirement of replicate counts in previous studies. Furthermore the growth curves generated on age estimates from each reader did not differ significantly.
ICES Journal of Marine Science – Oxford University Press
Published: Apr 1, 1999
Keywords: Photololigo sp. squid statoliths age and growth increments precision
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