Abstract
It have been well documented that many fish species that inhabit paddy field zone move to temporary waters for breeding, but life history of fishes that inhabit farm ponds have received little attention. We conducted an investigation in order to clarify the utilization of the water-network including a farm pond by fishes. As a result, in the beginning of irrigation period, fish such as loach and crucian got out of the farm pond and moved to the irrigation channel and the paddy field, along with rainfall. Therefore it was thought that the fish that inhabit farm ponds also move to temporary waters for breeding. In addition, breeding in the paddy fields or irrigation channels could be advantageous for native fish species that inhabit farm ponds, when exotic piscivorous largemouth bass inhabit the same ponds.
