NDLI: Cortisol is responsible for positive and negative effects in the ovarian maturation induced by the exposure to acute stressors in Nile tilapia, Oreochromis niloticus

Content Provider	Springer Nature Link
Author	Gentte, Vincent Sawadogo, Philippe Milla, Sylvain Kestemont, Patrick Mélard, Charles Rougeot, Carole
Copyright Year	2012
Abstract	The aim of the present study was to evaluate the effect of acute stress and cortisol injection on oocyte final maturation process in female Nile tilapia (Oreochromis niloticus). Handling followed by a prophylactic treatment (0.3 mL L−1 H2O2, 5 g L−1 NaCl solution during 30 min) and an environmental change (transfer from a 2 m3 fibreglass square tank to 50 L aquaria) were used as acute stressors and compared to a single cortisol injection (0.5 or 5 mg kg−1 body weight). For both acute stress and cortisol injection (0.5 mg kg−1 body weight), serum cortisol level was significantly increased from 2.3 to 134.1 ng mL−1 1 h post-stress/injection and returned to a resting basal value 24 h after the stress/injection. In fish injected with 5 mg kg−1 body weight cortisol, mean serum cortisol level reached a peak up to 2500 ng mL−1 1 h after injection. 63 % of the females (mean body weight: 242 ± 4 g) submitted to the acute stress ovulated within 72 h after the stress. In the same way, cortisol injection (5 mg kg−1 body weight) at the 10th day of the maturation cycle led to a twofold reduction of the time before ovulation compared to vehicle injected control fish. Relative and total fecundity were significantly decreased in females submitted to an acute stress or cortisol injected at 5 mg kg−1 body weight, but not fertilization or hatching rates. In conclusion, acute stress and cortisol induction exert both positive and negative effects on the final reproductive process in O. niloticus, and cortisol is the endocrine mediator causing these changes.
Starting Page	1619
Ending Page	1626
Page Count	8
File Format	PDF
ISSN	09201742
Journal	Fish Physiology and Biochemistry
Volume Number	38
Issue Number	6
e-ISSN	15735168
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-05-19
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cortisol Stress Fish reproduction Oocyte maturation Nile tilapia Animal Physiology Zoology Animal Anatomy / Morphology / Histology Animal Biochemistry Freshwater & Marine Ecology
Content Type	Text
Resource Type	Article
Subject	Physiology Medicine Biochemistry Aquatic Science

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