Клуб Исраквариум

И только в периоды размножения(несколько раз в год) ведут более или менее оседлый образ жизни, так как самец во время "насиживания" все равно не питается.

Reproductive migration of fish appears to be a universal phenomenon in most South American rivers.531 The fish, which migrate annually in the São Francisco, travel up the main river channel or in tributaries towards their spawning grounds. Their migration is a cyclic phenomenon that is most pronounced from October to January during the rainy season, when the water levels tend to rise,532 temperatures are higher and the days are longer.

Despite its undoubted importance, the migration of South American fresh-water fishes has not attracted the attention of scientists as much as it has that of the communities living along the rivers. Along the São Francisco, all residents are familiar with the migratory phenomenon, known locally as piracema (an indigenous word meaning pira = fish, cema = jump), but about which no more than a few scientific papers have been published. As a result, important aspects of the São Francisco River piracema, such as feeding and reproductive habitats, shoal composition and structure, and homing and distances travelled between habitats remain poorly understood.

Migratory fishes of the São Francisco are group-synchronous spawners, i.e., they spawn only once in a reproductive period, and are iteroparous, i.e., they are able to spawn again for at least several more years.

Fisheries yields in the Lower São Francisco (below Xingó Dam) in 1997, showing contribution of migratory species