EFFECTS OF DAILY HIGH WATER TEMPERATURE FLUCTUATIONS ON BRAIN-PITUITARY-GONAD AXIS OF PEJERREY (Odontesthes bonariensis) DURING ITS REPRODUCTIVE SEASON

MARIANO ELISIO; TOMÁS CHALDE; LEANDRO ANDRÉS MIRANDA

Cochin

Simposio; 9th International Symposium on Reproductive Physiology of Fish; 2011

Madras Christian College

The increases noted in the temperature of many water bodies which are considered to be consequences of global warming have already started to affect fish reproduction. Pejerrey is a multiple spawner and its reproductive activity begins when water temperatures reach around 13 to 15° C and peaks at temperatures between 18 to 20° C with a major spawning period during spring. It has been demonstrated that constant temperature regimes higher than 23° C impair pejerrey reproduction. In the last years, in shallow lakes from pampasic region of Argentina (the natural habitat of O. bonariensis), were reordered daily temperature fluctuations from 19° C to 27° C during some days in spring. The aim of this study was to examine the effects of short-term pulses of warm water on brain-pituitary-gonad axis of pejerrey during spawning season.