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Marine Biology

, Volume 154, Issue 5, pp 823–832 | Cite as

Decreased lipid storage in juvenile Atlantic cod (Gadus morhua) during settlement in cold-water eelgrass habitat

  • L. A. Copeman
  • C. C. Parrish
  • R. S. Gregory
  • J. S. Wells
Original Paper

Abstract

We characterized the prey field and the lipid classes/fatty acids in the flesh of age 0 juvenile cod (Gadus morhua) during their late-summer/fall arrival and settlement into eelgrass (Zostera marina) in coastal Newfoundland. Examination of available prey demonstrated a high abundance of small zooplankton (Acartia, Microsetella and Oithona sp.) with no larger Calanus sp. prey. Breakpoint analysis showed significant changes in the accumulation of relative (mg g−1 wet weight) and absolute (μg fish−1) amounts of lipid with standard length at the time of settlement (~60 mm standard length). Settling juvenile cod showed an alternate lipid utilization strategy where they catabolized phospholipids (PL) to a greater extent than triacylgylcerols (TAG). Polyunsaturated fatty acids (PUFA) content in cod flesh decreased as fish grew indicating that nearshore zooplankton quality was not optimal for PL formation. The dramatic reduction in cod PL was likely due to both catabolism of muscle and a lack of dietary PUFA suitable for PL synthesis. However, juvenile cod continued to grow, leading to decreased lipid stores and suggesting that cod settling into eelgrass are under intense selection pressure for growth prior to the onset of winter, possibly as a means of escaping gape-limited predation. These data contrast better-studied freshwater and estuarine systems in which lipid storage is critical for successful overwintering.

Keywords

Standard Length Lipid Class Juvenile Fish Eelgrass Habitat Recruitment Pulse 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

This research was supported by a NSERC Canadian Graduate Fellowship awarded to LA Copeman. We would like to thank Dr. Benjamin Laurel and Dr. Thomas Hurst for editorial comments on earlier drafts of this manuscript and for guidance with statistical analyses. We are also grateful to numerous student field research assistants that worked in Terra Nova National Park during the summer of 2002.

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • L. A. Copeman
    • 1
  • C. C. Parrish
    • 2
  • R. S. Gregory
    • 3
  • J. S. Wells
    • 1
  1. 1.Ocean Sciences CentreMemorial University of NewfoundlandSt John’sCanada
  2. 2.Ocean Sciences Centre and Chemistry DepartmentMemorial University of NewfoundlandSt John’sCanada
  3. 3.Fisheries and Oceans CanadaEnvironmental Sciences DivisionSt John’sCanada

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