publication . Article . Other literature type . 2009

LH secretion and ovulation following exposure of Arctic charr to different temperature and photoperiod regimes: Responsiveness of females to a gonadotropin-releasing hormone analogue and a dopamine antagonist

Bernard Breton; Christian Gillet;
Open Access English
  • Published: 01 Jun 2009
  • Publisher: HAL CCSD
  • Country: France
Abstract
The timing of ovulation and LH plasma levels were investigated in Arctic charr reared at 5 °C and 10 °C, exposed to the ambient photoperiod, or short or long-day photoperiod regimes during the prespawning period. The effectiveness of sGnRHa alone, or sGnRHa combined with a dopamine antagonist, in stimulating LH secretion and inducing ovulation was also investigated. With the natural photoperiod, ovulation occurred spontaneously at 5 °C, but was inhibited at 10 °C. A transition from 10 to 5 °C soon resulted in suppression of the inhibition. At 5 °C, the effectiveness of sGnRHa was similar to that of sGnRHa combined with pimozide in stimulating LH secretion and in...
Subjects
free text keywords: Arctic charr, fish, [SDV.MHEP.EM]Life Sciences [q-bio]/Human health and pathology/Endocrinology and metabolism, Endocrinology, medicine.medical_specialty, medicine, photoperiodism, Biology, Gonadotropin-releasing hormone analogue, medicine.medical_treatment, Pimozide, medicine.drug, Stimulation, Lh secretion, Dopamine antagonist, Dopamine, Internal medicine, Ovulation, media_common.quotation_subject, media_common
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