Journal Article

The recruitment of gill-infesting copepods as a categorical predictor of size-at-age data in squid populations

S. Pascual, A.F. González and A. Guerra

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 62, issue 4, pages 629-633
Published in print January 2005 | ISSN: 1054-3139
Published online January 2005 | e-ISSN: 1095-9289 | DOI: http://dx.doi.org/10.1016/j.icesjms.2004.12.017
The recruitment of gill-infesting copepods as a categorical predictor of size-at-age data in squid populations

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The independent effects of host age and size on the recruitment of the gill-infesting copepod parasite Pennella sp. were examined in the short-finned squid (Illex coindetii) from Galician waters (ICES Areas VIIIc–IXa). Older and larger squid had larger parasite infrapopulations, but in general the age of squid described the parasite recruitment to the host population better than did mantle length or body weight of squid. Parasite infrapopulations were markedly clumped or overdispersed in those squid hatchling groups with greater parasite recruitment, indicating close adjustment of host/parasite life cycles. Moreover, the gill infestation did moderate the relationship between age and body weight of squid, though the strength or importance of the variation associated with the relationships is not known. The results show that infestation by pennellids contributes to the variability in squid growth, being one of the multiple categorical predictors of size-at-age data in several infested cephalopod species commercially exploited in European waters.

Keywords: cephalopod; parasitic copepod; Pennella sp.; size-at-age data

Journal Article.  2113 words.  Illustrated.

Subjects: Environmental Science ; Marine and Estuarine Biology

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