It is suspected that a species of Peacock Bass, locally called Sargento was introduced by accident to Gatun Lake by a renowned Panamanian aquarist and doctor in 1958. These peacock bass are not a native game fish of Panama but originate from the Amazon, Rio Negro and Orinoco river basins of South America. Lake Gatun is known to be one of the best peacock bass angling lakes in the world.