Petrocephalus steindachneriPetrocephalus steindachneri is a species of electric fish in the family Mormyridae. It is native to the Rufuji River system in Tanzania.SizeThis species reaches a length of.EtymologyThe fish was named after Austrian ichthyologist Franz Steindachner, who had described this species in 1914 but used a preoccupied name, P. affinis Sauvage 1879.