“…The reproductive, growth and mortality patterns of P. nigricans have been studied in Bolivia (Loubens, Panfili, 1995), Ecuador (Silva, Stewart, 2006) and Brazil (Ruffino, Isaac, 1995;Catarino et al, 2014;Camargo et al, 2015). Surprisingly, in spite of its commercial importance, very few studies have been carried out on this species in Colombian and Peruvian rivers, apart from preliminary studies on its growth (Montreuil, Tello, 1988) and reproductive biology in Peru (Montreuil et al, 2001;Riofrío, 2002). Information about the population dynamics of this species is lacking to guide fisheries management.…”