[2] Kirikuchi char remain in two separate headwater streams of the Totsu River system, and they retain little genetic variation.

[2] The Kirikuchi Char is endangered due to human disturbances, including degradation and overharvesting.

Additionally, the species continues to become more endangered due to the loss of genetic diversity from hybridization.

[3] Up to 60% of the diet of Kirikuchi char is made up of orthopterans driven into the water by nematomorph parasites.

The chars' growth rates are highest in autumn, when nematomorphs influence the behaviour of their hosts to drown themselves.