Geographic, seasonal and ontogenetic variation in cadmium and mercury concentrations in squid (Cephalopoda : Teuthoidea) from UK waters

Type Article
Date 2008-07
Language English
Author(s) Pierce G2, Stowasser G2, Hastie L2, Bustamante Paco1, 3
Affiliation(s) 1 : Univ La Rochelle, Ctr Rech Ecosyst Littoraux Anthropises, UMR CNRS IFREMER 6217, F-17042 La Rochelle, France.
2 : Univ Aberdeen, Sch Biol Sci Zool, Aberdeen AB24 2TZ, Scotland.
Source Ecotoxicology and Environmental Safety (0147-6513) (Elsevier), 2008-07 , Vol. 70 , N. 3 , P. 422-432
DOI 10.1016/j.ecoenv.2007.07.007
WOS© Times Cited 53
Keyword(s) Risk for human consumption, Bioaccumulation, Trace elements, Heavy metals, Cephalopods
Abstract Cadmium (Cd) and mercury (Hg) levels were measured in the tissue samples of two loliginid (Alloteuthis sp. and Loligo forbesi) and two ommastrephid (Todarodes sagittatus and Todaropsis eblanae) squid species collected from research cruise and fishery (market) samples in UK waters during 2004-05. Concentrations of Cd were generally higher in the ommastrephids, in all tissues except muscle. Hg concentrations were higher in T sagittatus than in the loliginids. In L. forbesi, metal concentrations differed between tissues and also varied in relation to body size, geographic origin, and season. Cd levels decreased with increasing body size. This may be related to a shift in the diet with growth, since small L. forbesi feed on benthic invertebrates that have relatively high Cd concentrations, whereas larger individuals prey mainly on fish that have low Cd concentrations. Hg levels increased with body size, indicating its retention, and they were highest at the end of the spawning season and in squid from the English Channel and the Scottish West Coast. It is likely that the ambient concentration of Hg in seawater plays an important part in its accumulation in squid tissues. As it is a short-lived species, L. forbesi may therefore function as a bioindicator species for Hg contamination of the marine environment. Our results indicate that there is no significant danger to humans from consuming squid from UK waters. (C) 2007 Elsevier Inc. All rights reserved.
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