Pheromones as time cues for circadian rhythms in fish

Almost all living organisms, including fish, exhibit circadian rhythms. They synchronize their circadian clocks with the solar clock through the mediation of photic or non-photic zeitgebers. Pheromones are the major chemicals responsible for communication among the conspecifics. Pheromones are secreted by a sender and perceived by receiver (s), thus evoking a species specific response and in turn affecting the behavior of receiver (s). Can a pheromone act as a zeitgeber in fish? In this mini review attempts have been made to address the question.