Pond Boss Forums MANAGING AN EXISTING POND Evaluating and adjusting fish populations Spawn Tme Fun

Bruce is correct in pointing out the importance of photoperiod in the spawning process. I have often observed my yellow perch not begin spawning despite the early occurrrence of correct water temps. However as the day length progressively increases in length then the primary spawn begins. I think some or a few individual fish will spawn early despite the photoperiod is not exactly correct. This is undoubtedly due to an innate amount of variation within each species. The variation allows for or results in the evolutionary change that is always occurring among species.