[2] The development of the areas surrounding Lake Ikeda has caused the quality of the water to decline since 1955.

[2] Other causes include an irrigation project, developed for agricultural field and households in the area, which was initiated in 1965, for it the courses of three nearby rivers were diverted into the lake.

[2] The irrigation system has been in operation since 1982, resulting in a considerable improvement of the water quality[2] although since the 1950s the transparency of the lake, though still ranked No.

According to mythology, Issie was a white mare who lived together with her foal on the shore of Lake Ikeda.

Twenty other people reportedly also saw the creature swimming in the lake in 1978; they described it as black and having two humps, each about 5 meters (16 feet) long.