Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Trace elements as fingerprint of lake of provenance and of species of some native and exotic fish of Northern Patagonian lakes.

Abstract

A survey conducted between 2001 and 2002 on trace element contents in fish muscle and liver was performed in different lakes of two northern Patagonian national parks: Nahuel Huapi and Los Alerces national parks. The aim of the work was to obtain the first set of reference data on elements that are not liable to be disturbed by human activities and to identify compositional patterns related to the species and site of collection. The species studied were native creole perch and velvet catfish and exotic brown trout, rainbow trout, and brook trout. The elements analysed were Br, Cs, Fe, Rb, Se, Na, and Zn. Trace elements in muscles of brown trout, rainbow trout, and creole perch showed statistical patterns that allowed one to identify the national park of origin, as well as those from which specific lakes (Traful, Espejo Chico, or the Nahuel Huapi-Moreno system) of the Nahuel Huapi National Park they came from. Liver contents provided similar but less clear patterns than contents in muscle; however, in some particular cases, they provide additional information. Trace element contents in muscle were also good indicators of the species collected within a lake.