Intestinal helminths as population markers of the Amazonian fish Mylesinus paraschomburgkii, with descriptions of five new genera and seven new species of trematodes

Abstract

Helminths from the intestinal tracts of fish called "pacus" were studied. The fish were found only in rapid areas of Northeastern tributaries of the Amazon River. Since this species, Mylesiiius paraschonlburgkii JÉGU, SANTOS & FERREIRA, 1989, does not migrate, each river has a separate population in its upper reaches. These populations are believed to have been isolated from each other.