Effects of short periods of warm water fluctuations on reproductive endocrine axis of the pejerrey (Odontesthes bonariensis) spawning

Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
Mariano ElisioL A Miranda

Abstract

The aim of this study was to assess fluctuations in daily water temperature in Chascomús Lagoon during one year, and to evaluate whether the highest temperature recorded during pejerrey spawning season can produce an endocrine disruption on brain-pituitary-gonads axis. Fish were subjected to daily temperature fluctuations: 17 °C to 19 °C (reproductive control), 19 °C to 25 °C, and 19 °C to 27 °C. After 8 days, ten fish per treatment were sacrificed and gene expression of gonadotropin-releasing hormone (GnRH-I, GnRH-II, GnRH-III), gonadotropin subunits-β (FSH-β, LH-β), glycoprotein hormone-α (GPH-α), gonadotropin receptors (FSH-R, LH-R), and gonadal aromatase (cyp19a1a) was analyzed. Also, plasma levels of sexual steroids and gonadal reproductive status were studied. Fish exposed to high temperature fluctuations quit spawning, presenting clear signs of gonadal regression. Fish recovered its spawning activity 11 weeks after heat treatment. At endocrine level, GnRH-I and FSH-β in both sexes, LH-β and GPH-α in males and FSH-R, LH-R and cyp19a1a in females decreased significantly in treated fish. Also, a strong reduction in plasma sex steroid levels was found for both sexes. This study demonstrated that pulses of warm water in natur...Continue Reading

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Citations

Jun 4, 2014·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Mariano ElisioLeandro A Miranda
Jan 28, 2015·General and Comparative Endocrinology·Mariano ElisioLeandro A Miranda
Mar 19, 2013·General and Comparative Endocrinology·Leandro Andrés MirandaCarlos Augusto Strüssmann
Jun 22, 2020·Journal of Fish Biology·Maud AlixKelli C Anderson
Jul 8, 2020·Science·Flemming T DahlkeHans-Otto Pörtner
Jan 13, 2018·Conservation Physiology·Heather D VeilleuxPhilip L Munday
Sep 12, 2019·Marine Genomics·Paola González-KotherDario Moraga
Feb 18, 2020·General and Comparative Endocrinology·Arianna ServiliJosé Antonio Muñoz-Cueto

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