Pituitary follicle-stimulating hormone (FSH) and luteinizing hormone (LH) levels in maturing female flounder Platichthys flesus under hydrostatic pressure simulating vertical migrations

Alfredo Damasceno-Oliveira*, Berta Levavi-Sivan, Joseph Aizen, José Gonçalves, Begoña Fernández-Durán, João Coimbra

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Rhythmic vertical migration is a widespread feature among teleost species and the ultimate reasons for this behaviour could be as diverse as transport, feeding, predator avoidance or reproduction strategies. A rhythmic vertical migration implies that a fish will experience associated cyclic pressure changes. We examined the effect of 14-day exposure to cyclic variations in hydrostatic pressure (HP) and to elevated constant HP on pituitary levels of two types of gonadotropin, luteinizing hormone (LH) and follicle-stimulating hormone (FSH), in maturing but not ovulating female European flounder (Platichthys flesus). Fish were exposed to cyclic HP with a tidal period of 12.4 h and an amplitude of 600 kPa, between 200 and 800 kPa (environmentally realistic vertical migration), to constant absolute HP of 800 kPa, and to a maximum 1 m height water column. Flounder pituitary FSH content was remarkably higher under cyclic HP conditions than under constant normal or elevated HP conditions. In fact, pituitary FSH levels were undetectable, irrespective of the constant HP regimen. By contrast, pituitary LH levels showed no significant differences between the different groups at the end of the experimental period. This study describes an important alteration of the brain-pituitary-gonad (BPG) axis provoked by exposure to HP fluctuations, which mimic conditions in nature. The results indicate that levels of FSH in female European flounder are influenced by rhythmic vertical migrations.

Original languageAmerican English
Pages (from-to)85-92
Number of pages8
JournalMarine Biology Research
Volume10
Issue number1
DOIs
StatePublished - Jan 2014

Bibliographical note

Funding Information:
This work was partly supported by the Portuguese Foundation for Science and Technology, Ministry for Science and Higher Education (grants SFRH/ BD/847/2000 and SFRH/BPD/36213/2007). The authors would like to thank Catarina Gomes for advice on the text and Hugo Santos for technical assistance.

Keywords

  • Platichthys flesus
  • gonadotropins
  • hydrostatic pressure
  • reproduction
  • vertical migrations

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