Descripción: “...The supply of rations attending to the nutrient demand from the different phases of tilapia’s lifecycle lead to optimum yield being obtained regarding weight gain and feed conversion, guaranteeing high sanitary status when producing this specie.Key words: nutrient demand, energy, mineral, fish, protein.Resumo:   Esta revisão foi realizada com o objetivo de recolher informação dos recentes avanços sobre as exigências de alguns nutrientes para a tilápia Nilótica (Oreochromisniloticus).As exigências de proteína bruta estão sendo substituídas pela exigência especifica de aminoácidos, como no caso da lisina e da metionina, aplicando o conceito de proteína ideal. ...”

Descripción: “...Todos los índices mostraron  tendencia a mejorar  su comportamiento con los niveles energéticos más altos.Palabras clave: nutrición de peces, proteína, energía, pez de agua dulce, Brycon siebenthalae.ABSTRACT: This experiment was conducted in order  to determine  the optimum ratio of energy to protein in the diet (DE kcal/PB%)  of yamú (Brycon siebenthalae)  by feeding  them various semi-purified diets containing different amounts of protein (17, 21,  25%) and energy ( 2.6, 2.9 and 3.2 kcal DE/g diet). ...”

Descripción: “...Palabras Clave: Codornices,  producción de huevos, requerimientos nutricionales.Abstract:   This work was carried out at the Universidad de the Llanos’ quail section for determining the optimum  crude protein (CP) level for Japanese quail during their egg-laying phase. ...”