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Lipid and fatty acid composition of parasitic caligid copepods belonging to the genus Lepeophtheirus.
Comp Biochem Physiol B Biochem Mol Biol. 2010 Jun; 156(2):107-14.CB

Abstract

Sea lice are copepod ectoparasites that constitute a major barrier to the sustainability and economic viability of marine finfish aquaculture operations worldwide. In particular, the salmon louse, Lepeophtheirus salmonis, poses a considerable problem for salmoniculture in the northern hemisphere. The free-swimming nauplii and infective copepodids of L. salmonis are lecithotrophic, subsisting principally on maternally-derived lipid reserves. However, the lipids and fatty acids of sea lice have been sparsely studied and therefore the present project aimed to investigate the lipid and fatty acid composition of sea lice of the genus Lepeophtheirus obtained from a variety of fish hosts. Total lipid was extracted from eggs and adult female L. salmonis obtained from both wild and farmed Atlantic salmon (Salmo salar L.) sampled at two time points, in the mid 1990s and in 2009. In addition, L. salmonis from wild sea trout (Salmo trutta L.) and L. hippoglossi from wild Atlantic halibut (Hippoglossus hippoglossus L.) were sampled and analyzed. The lipids of both females and egg strings of Lepeophtheirus were characterized by triacylglycerol (TAG) as the major neutral (storage) lipid with phosphatidylcholine and phosphatidylethanolamine as the major polar (membrane) lipids. The major fatty acids were 22:6n-3 (DHA), 18:1n-9 and 16:0, with lesser amounts of 20:5n-3, 22:5n-3 and 18:0. L. salmonis sourced from farmed salmon was characterized by higher levels of 18:2n-6 and 18:3n-3 than lice from wild salmon. Egg strings had higher levels of TAG and lower DHA compared to females, whereas L. hippoglossi had lower levels of TAG and higher DHA than L. salmonis. The results demonstrate that the fatty acid compositions of lice obtained from wild and farmed salmon differ and that changes to the lipid and fatty acid composition of feeds for farmed salmon influence the louse compositions.

Authors+Show Affiliations

Institute of Aquaculture, University of Stirling, Stirling FK94LA, Scotland, United Kingdom.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

20206710

Citation

Tocher, J A., et al. "Lipid and Fatty Acid Composition of Parasitic Caligid Copepods Belonging to the Genus Lepeophtheirus." Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology, vol. 156, no. 2, 2010, pp. 107-14.
Tocher JA, Dick JR, Bron JE, et al. Lipid and fatty acid composition of parasitic caligid copepods belonging to the genus Lepeophtheirus. Comp Biochem Physiol B, Biochem Mol Biol. 2010;156(2):107-14.
Tocher, J. A., Dick, J. R., Bron, J. E., Shinn, A. P., & Tocher, D. R. (2010). Lipid and fatty acid composition of parasitic caligid copepods belonging to the genus Lepeophtheirus. Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology, 156(2), 107-14. https://doi.org/10.1016/j.cbpb.2010.02.010
Tocher JA, et al. Lipid and Fatty Acid Composition of Parasitic Caligid Copepods Belonging to the Genus Lepeophtheirus. Comp Biochem Physiol B, Biochem Mol Biol. 2010;156(2):107-14. PubMed PMID: 20206710.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Lipid and fatty acid composition of parasitic caligid copepods belonging to the genus Lepeophtheirus. AU - Tocher,J A, AU - Dick,J R, AU - Bron,J E, AU - Shinn,A P, AU - Tocher,D R, Y1 - 2010/03/04/ PY - 2010/01/19/received PY - 2010/02/26/revised PY - 2010/02/26/accepted PY - 2010/3/9/entrez PY - 2010/3/9/pubmed PY - 2010/6/29/medline SP - 107 EP - 14 JF - Comparative biochemistry and physiology. Part B, Biochemistry & molecular biology JO - Comp. Biochem. Physiol. B, Biochem. Mol. Biol. VL - 156 IS - 2 N2 - Sea lice are copepod ectoparasites that constitute a major barrier to the sustainability and economic viability of marine finfish aquaculture operations worldwide. In particular, the salmon louse, Lepeophtheirus salmonis, poses a considerable problem for salmoniculture in the northern hemisphere. The free-swimming nauplii and infective copepodids of L. salmonis are lecithotrophic, subsisting principally on maternally-derived lipid reserves. However, the lipids and fatty acids of sea lice have been sparsely studied and therefore the present project aimed to investigate the lipid and fatty acid composition of sea lice of the genus Lepeophtheirus obtained from a variety of fish hosts. Total lipid was extracted from eggs and adult female L. salmonis obtained from both wild and farmed Atlantic salmon (Salmo salar L.) sampled at two time points, in the mid 1990s and in 2009. In addition, L. salmonis from wild sea trout (Salmo trutta L.) and L. hippoglossi from wild Atlantic halibut (Hippoglossus hippoglossus L.) were sampled and analyzed. The lipids of both females and egg strings of Lepeophtheirus were characterized by triacylglycerol (TAG) as the major neutral (storage) lipid with phosphatidylcholine and phosphatidylethanolamine as the major polar (membrane) lipids. The major fatty acids were 22:6n-3 (DHA), 18:1n-9 and 16:0, with lesser amounts of 20:5n-3, 22:5n-3 and 18:0. L. salmonis sourced from farmed salmon was characterized by higher levels of 18:2n-6 and 18:3n-3 than lice from wild salmon. Egg strings had higher levels of TAG and lower DHA compared to females, whereas L. hippoglossi had lower levels of TAG and higher DHA than L. salmonis. The results demonstrate that the fatty acid compositions of lice obtained from wild and farmed salmon differ and that changes to the lipid and fatty acid composition of feeds for farmed salmon influence the louse compositions. SN - 1879-1107 UR - https://www.unboundmedicine.com/medline/citation/20206710/Lipid_and_fatty_acid_composition_of_parasitic_caligid_copepods_belonging_to_the_genus_Lepeophtheirus_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S1096-4959(10)00056-4 DB - PRIME DP - Unbound Medicine ER -
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