Widespread prescription of fluoxetine has led to enter into the aquatic environments which act as an endocrine disruptor for fish. This study examined the effect of fluoxetine on the reproductive consequence of convict cichlid (Amatitlania nigrofasciata), during three successive cycles of spawning. Following pair-bond formation, pairs were divided into four treatments and exposed to concentrations of 0, 0.54, 5.40 or 54.0 μg LG 1 fluoxetine in pre-acclimated spawning tanks. Reproduction was assessed by examination of Egg Number (EN), Incubation Period (IP), Hatching Ratio (HR) and Inter-Spawning Interval (ISI). At the last spawning cycle, behavior and physiochemical properties of fish were determined. Hepatosomatic index (HSI) of males/females was insignificant at the end of the experiment; however, condition factor of males showed a significant difference between 0 and 54.0 μg LG 1 fluoxetine treatments. At 5.40 and 54.0 μg LG 1 of fluoxetine, testosterone were significantly decreased in males. Both main effects of the fluoxetine concentrations and the spawning cycles were significant in the EN, HR and ISI. IP was significantly affected only by fluoxetine. The behaviors, spawning duration and fanning latency were affected in 54.0 μg LG 1 fluoxetine but time spent near the substrate and lipping display were not affected. Results indicated that fluoxetine disrupts reproduction features of convict cichlid. However, significant impacts were mainly observed at higher concentrations than those reported in natural environments (0.54 μg LG 1), so that the impact of fluoxetine on reproductive fitness of cichlid populations might be relatively low.
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