Document Detail

Plasma steroid hormone levels in female flounder Platichthys flesus and the influence of fluctuating hydrostatic pressure.
MedLine Citation:
PMID:  22903054     Owner:  NLM     Status:  Publisher    
The reproductive cycle in teleosts is timed to guarantee that eggs hatch in the right place at the right time, with environmental factors playing important roles in entraining and controlling the entire process. The effects of some environmental factors, like temperature and photoperiod, are now well understood. There are only a few studies regarding the effects of hydrostatic pressure (HP) on the reproductive cycle, in spite of its importance as a ubiquitous factor in all biological environments and affecting all living organisms. Hydrostatic pressure is of particular importance in fish because they can also experience rapid and cyclic changes in HP due to vertical movements in the water column. The aim of the present research was to investigate the effects of vertical migrations on the reproductive steroids of maturing female flounder. After a 14day exposure to cyclic hydrostatic pressure (with a period of 12.4h and with a maximum peak of 800kPa of absolute hydrostatic pressure), fish showed significantly lower plasmatic concentrations of "5β,3α" steroids, metabolites of the putative maturation-inducing steroid in flounder (17α,20β-dihydroxy-4-pregnen-3-one). Results indicate that environmentally realistic cyclic changes of hydrostatic pressure can influence the metabolism of reproductive steroids. This suggests a physiological role of tidally-associated vertical migrations, affecting oocyte maturation and retarding the reproductive cycle in this species until the spawning ground is attained.
A Damasceno-Oliveira; B Fernández-Durán; J Gonçalves; E Couto; A V M Canário; J Coimbra
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-8-10
Journal Detail:
Title:  Comparative biochemistry and physiology. Part A, Molecular & integrative physiology     Volume:  -     ISSN:  1531-4332     ISO Abbreviation:  Comp. Biochem. Physiol., Part A Mol. Integr. Physiol.     Publication Date:  2012 Aug 
Date Detail:
Created Date:  2012-8-20     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9806096     Medline TA:  Comp Biochem Physiol A Mol Integr Physiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012. Published by Elsevier Inc.
CIIMAR/CIMAR-LA - Centro Interdisciplinar de Investigação Marinha e Ambiental, Laboratory of Ecophysiology, University of Porto, R. dos Bragas, 177, 4050-123 Porto, Portugal; ICBAS - Instituto de Ciências Biomédicas de Abel Salazar, University of Porto, Lg. A. Salazar, 4099-003 Porto, Portugal.
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