The withebait Galaxias maculatus is an endemic species from Argentina and Chile (Cussac et al., 2004), and it is important in ecological webs in Argentinean and Chilean inland waters (Soto & Zuniga, 1991; Soto et al., 1994; Modenutti et al., 1998). This species has a maximum size of 17 cm and its migratory juvenile stage is transparent or “crystalline” (Mardones et al., 2008). In Chile the juvenile stage is known as “puye” and the pigmented adult stage as “ao”. In Argentina in the larval stage is known as “puyen”, whereas in New Zealand is known as “withebait”, whereas the adults are known as “inanga” (McDowall, 1971).