Metabolic costs of changing the cation-anion difference in the diet of juvenile African catfish Clarias gariepinus (Burchell)

acuicultura ammonia ammoniac anion aniones anions aquaculture azote cation cationes cations clarias gariepinus consumo de energia costos costs diet dieta electrolytes energia energie energy energy consumption energy metabolism expenditure gastos losses metabolismo energetico metabolizable energy monitoring nitrogen oxygen consumption perte respiration uses usos utilisation vigilancia