“…Amatitlania nigrofasciata was introduced into "Riacho Guarani" by a local resident (personal communication), possibly due to its ornamental value (Magalhães & Jacobi, 2010 invasion shows that A. nigrofasciata is likely to invade local ecosystems, considering its thermal tolerance, life history traits, territoriality, opportunistic feeding habits and propagule pressure (Magalhães & Jacobi, 2013;Mendoza et al, 2015). If propagated, its main local competitor would be the native cichlid species Cichlasoma orientale Kullander, 1983 (voucher number UFRN4836), with which it has the greatest phylogenetic relatedness and similar life history traits, including a small number of large oocytes, multiple spawning, parental care (Ishikawa & Tachihara, 2010;Linhares et al, 2014) and K-selection-a common strategy in density-dependent species (Zeug & Winemiller, 2007). Interestingly, an experimental study showed that Cichlasoma istlanum (Jordan & Snyder, 1899) spent more time in shelters, and fed and moved less when in the presence of A. nigrofasciata.…”