“…It has been described as polygamous (Shestopalova, 1978 ;Turner, 1986 ;Spivak, 1987 ;Billard, 1997 ;Poncin et al, 2000 ) and phytophilous spawner (Gillet, 1989 ;Kozlovskij, 1991 ;Mill, 1991). In common bream, males exhibit territorial and aggressive activity (Svardson, 1949 ;Fabricius, 1951 ;Poncin et al, 1996 ) but in silver bream, males are nonaggressive and nonterritorial (Poncin et al, 2004 ;Nzau Matondo et al, 2008b ). However, the ethological aspects of the hybridization process of these species remain totally unknown.…”