Author: (Boulenger, 1908)
Remark: Quote Turner et al. (Ref. 55949): "We consider that both <i>R. leptosoma</i> and <i>R. melanotus</i> are probably junior synonyms of <i>R. esox</i>. If this is accepted, <i>R. esox</i> can be considered the most distinctive and readily identified species of the genus."
Comments: Inhabits the open water (Ref. 5595).  Widely distributed in shelf and rocky reef zones, usually where the bottom is fairly shallow; rarely found offshore; small juveniles widely distributed in the littoral zone in swampy, sandy and rocky habitats; adults regularly encountered near sandy beaches in the shallows (Ref. 55949).  Feeds on fish species like the small Utaka and the lake sardine Usipa (<i>Engraulicypris sardella</i>) (Ref. 5595).