Author: (Kner, 1863)
Remark: Redescription by Bussing (1975), as <i>Cichlasoma sieboldii</i>. Reviewed by Bussing (1998: 372), as <i>Theraps sieboldii</i>, with key, diagnosis, geographical distribution, and figures. Molecular analysis suggests that <i>T. sieboldii</i> is not closely related to <i>T. tuba</i> (Martin & Bermingham, 1998), but the species is maintained in <i>Tomocichla</i> pending a more general revision of heroin cichlids.
Comments: Inhabits moderate to fast flowing waters.  Juveniles feed primarily upon aquatic insects while adults feed on vegetable matter such as aufwuchs and algae.  Produces about 200-300 fry (Ref. 7335).