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The partitioning of free amino acids between phytoplankton, zooplankton and ichthyoplankton in the Ushant region
Martin-Jézéquel, V.; Camus, P.A.; Poulet, S.A. (1989). The partitioning of free amino acids between phytoplankton, zooplankton and ichthyoplankton in the Ushant region, in: Ros, J.D. (Ed.) Topics in Marine Biology: Proceedings of the 22nd European Marine Biology Symposium, Barcelona, Spain, August 1987. Scientia Marina (Barcelona), 53(2-3): pp. 259-268
In: Ros, J.D. (Ed.) (1989). Topics in Marine Biology: Proceedings of the 22nd European Marine Biology Symposium, Barcelona, Spain, August 1987. Scientia Marina (Barcelona), 53(2-3). Instituto de Ciencias del Mar: Barcelona. 145-754 pp., more
In: Scientia Marina (Barcelona). Consejo Superior de Investigaciones Científicas. Institut de Ciènces del Mar: Barcelona. ISSN 0214-8358, more
Peer reviewed article  

Available in Authors 
    VLIZ: Proceedings [16920]
Document type: Conference paper

Keyword
    Marine

Authors  Top 
  • Martin-Jézéquel, V.
  • Camus, P.A.
  • Poulet, S.A.

Abstract
    The concentration of 20 free amino acids (FAA) was investigated in extracts of naturally occurring seston (< 500 µm), and from stomachs (midgut) of two species of pelagic fish postlarvae (4-15 mm): Scomber scombrus L. and Trachurus trachurus L. Samples were collected in July 1986 from thermally stratified waters off Ushant. Their total concentration varied in relation to the size of the particles and post-larvae, and the time and depth of sampling. Good correspondence can be found between FAA quantity in the midguts of the larvae and the localisation of both prey and predators. The major amino acids in seston were glutamic acid, glycine, serine and taurine. The most abundant amino acids measured in the midguts of the post-larvae of both species were glycine, arginine, alanine, taurine, leucine, valine, ornithine and lysine. According to the determination of prey in midgut contents, the partitioning of amino acids in phytoplankton, zooplankton and fish larvae demonstrated that zooplankton (copepods) were the main source of FAA in the midguts of the fish larvae; but the different composition of FAA found in the midguts of the fish larvae; but the different composition of FAA found in the midguts during the diurnal cycle cannot be related to variations of feeding activity of the post-larvae.

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