It is native to marine and brackish waters of inner bays in Japan, Thailand and Australia.

[4] The species is also paedomorphic, with mature adults retaining some characteristics of larvae.

[4] The adult female and both types of male generally measure between 1.1 and 1.2 centimeters long.

She grows a pelvic fin, changes shape, and produces fertile sperm.

[4] This small fish is also known to reach sexual maturity very quickly, at about 42 to 67 days of age.