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Temperature effects along the reproductive axis during spawning induction of grass carp (Ctenopharyngodon idella).

Abstract：

:For grass carp (Ctenopharyngodon idella) raised in the Ivory Coast (with water temperatures of 26-31 degrees C), induced spawning is obligatory for fry production. However, ovulation rates following hormonal treatment are often low. We hypothesized that high temperatures are an inhibiting factor for the reproductive axis (brain-pituitary-gonad) in these conditions. By in vivo and in vitro experiments, we tried to determine the thermosensitive steps during spawning induction. We compared gonadotropin and maturation-inducing steroid (MIS) profiles during a spawning induction at controlled temperatures of 24 and 28 degrees C in relation to ovulation success. We performed pituitary cell cultures and ovarian fragment incubations at controlled temperatures. The ovulation rate was lower at 28 degrees C (10%) than at 24 degrees C (36%). At the pituitary level, we found only minor thermal impacts on GnRH-stimulated LH release, but our data suggest an increase of the dopaminergic inhibition by high temperatures. The main effects were found at the ovary level, where ovary responsiveness to gonadotropin by MIS synthesis was disturbed, as well as oocyte responsiveness to MIS triggering final maturation, and probably ovulation. These results show the importance of regulating temperature during spawning induction to ensure a high rate of ovulation.

journal_name

Gen Comp Endocrinol

journal_title

General and comparative endocrinology

authors

Glasser F,Mikolajczyk T,Jalabert B,Baroiller JF,Breton B

doi

10.1016/j.ygcen.2003.12.009

keywords:

subject

Has Abstract

pub_date

2004-04-01 00:00:00

pages

171-9

issue

2

eissn

0016-6480

issn

1095-6840

pii

S0016648003004489

journal_volume

136

pub_type

杂志文章

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