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Corpus Systématique Animale

Titre du document

Plasma somatolactin levels in coho salmon ( Oncorhynchus kisutch ) during smoltification and sexual maturation

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Springer (journals)
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Mots-clés d'auteur
  • somatolactin
  • GH/PRL family
  • radioimmunoassay
  • plasma levels
  • reproductive maturation
  • smoltification
Nom du fichier dans la ressource
  • Mariann Rand-Weaver 1
  • Penny Swanson 2,3
  • 1) Department of Biology and Biochemistry, Brunel University, UB8 3PH, Uxbridge, Middlesex, England
  • 2) School of Fisheries, University of Washington, 98195, Seattle, Washington, U.S.A.
  • 3) Northwest Fisheries Science Center, 2725 Montlake Boulevard East, 98112, Seattle, Washington, U.S.A.

Somatolactin (SL) is a novel pituitary hormone recently characterized in several fish species. Structural analyses have shown that SL belongs to the growth hormone/prolactin family, and that it is a highly conserved protein. SL is synthesized by the periodic acid/Schiff-positive cells in the pars intermedia, but has an as yet unidentified function(s). We have recently developed a homologous radioimmunoassay for coho salmon SL and measured plasma levels of SL during two stages of the coho salmon life cycle, smoltification and sexual maturation. During smoltification, plasma levels of SL changed almost in parallel with plasma levels of thyroxine; levels increased as morphological indices of smoltification appeared and decreased as smoltification was completed. Following this period, SL levels remained low until the spring prior to spawning. In a separate study, plasma levels of SL were measured in sexually maturing coho salmon that remained in fresh water throughout their life cycle. During the year of sexual maturation, plasma levels of SL gradually increased from the spring onward, reaching peak levels at the time of spawning in November and December. These data are similar to those previously reported for sexually maturing coho salmon that were maintained in seawater prior to spawning (Rand-Weaver et al. 1992). Therefore, increases in plasma SL levels occurred in sexually maturing fish irrespective of whether they were maintained in fresh water or seawater. Peak levels at spawning were higher than those observed during smoltification. Possible roles for SL in metabolism and reproduction are discussed.

Catégories Science-Metrix
  • 1 - applied sciences
  • 2 - agriculture, fisheries & forestry
  • 3 - fisheries
Catégories INIST
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
Catégories Scopus
  • 1 - Life Sciences ; 2 - Agricultural and Biological Sciences ; 3 - Aquatic Science
  • 1 - Health Sciences ; 2 - Medicine ; 3 - General Medicine
  • 1 - Life Sciences ; 2 - Biochemistry, Genetics and Molecular Biology ; 3 - Physiology
  • 1 - Life Sciences ; 2 - Biochemistry, Genetics and Molecular Biology ; 3 - Biochemistry
Catégories WoS
  • 1 - science ; 2 - physiology
  • 1 - science ; 2 - fisheries
  • 1 - science ; 2 - biochemistry & molecular biology
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Fish Physiology and Biochemistry

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