Nutrition / Metabolic Bone Disease / Captive Breeding / South America / River Basin / Congenital Anomalies / MEAH. Historia. Revista científica / Fresh water / Growth rate / Vitamin A deficiency / Revista Científica / Clinical evaluation / Mortality rate / Congenital Anomalies / MEAH. Historia. Revista científica / Fresh water / Growth rate / Vitamin A deficiency / Revista Científica / Clinical evaluation / Mortality rate