Abstract
The effects of a simulated bacterial infection during the preovulatory period on the timing of ovulation and subsequent egg quality were investigated in rainbow trout ( Oncorhynchus mykiss). Lipopolysaccharide (LPS) was injected intraperitoneally during the preovulatory period to mimic a bacterial infection. Eggs obtained from LPS-treated females exhibited significantly lower quality characterized by lower survival both at eyeing and yolk-sac resorption. Interestingly, the lowest embryonic survival was observed when ovulation occurred within 10 days after LPS-stimulation. Indeed, a strong correlation was observed between egg quality and the ovulatory response (in days) after LPS injection. In addition, a high incidence of abnormal alevins was observed in some LPS-treated females. Our observations also suggest that LPS administration could trigger the ovulatory process and advance the timing of ovulation. In the present study, we provide for the first time evidence that administration of bacterial LPS in preovulatory rainbow trout females causes a decrease in egg quality and embryonic survival, possibly as a result of advanced ovulation.
Published Version
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