Elevated plasma triglycerides and growth rate are early indicators of reproductive status in post-spawning female steelhead trout (Oncorhynchus mykiss )

Conservation Physiology
Laura E JenkinsJ J Nagler

Abstract

Many iteroparous fishes spawn after skipping one or more yearly cycles, which impacts recruitment estimates used for fisheries management and conservation. The physiological mechanisms underlying the development of consecutive and skip spawning life histories in fishes are not well understood. In salmonids, lipid energy reserves and/or growth are thought to regulate the initiation of reproductive maturation during a critical period ~1 year prior to spawning. The fasting spawning migration of summer-run steelhead trout (Oncorhynchus mykiss) results in significant depletion of energy reserves during the proposed critical period for repeat spawning. To determine whether and when lipid energy reserves and growth influence repeat spawning, measures of lipid energy reserves, growth rate and reproductive development were tracked in female steelhead trout from first to second spawning as a consecutive or skip spawner in captivity. Plasma triglyceride (TG) levels and growth rate were elevated by 10 weeks after spawning in reproductive (i.e. consecutive spawning) versus non-reproductive (i.e. skip spawning) individuals. Muscle lipid (ML) levels, condition factor and plasma estradiol levels increased at later time points. The early differ...Continue Reading

References

Jul 28, 2005·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Ashild Krogdahl, Anne Marie Bakke-McKellep
May 16, 2009·General and Comparative Endocrinology·Geir Lasse TarangerTom Hansen
Dec 18, 2013·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Natalia Zaldúa, Daniel E Naya
Feb 11, 2015·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Zoé GautheyJacques Labonne

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