Resumo

PANTOJA, JAIDER OSWALDO; SANCHEZ, SANDRA MAGALLY  e  HOYOS C, JOSÉ LUIS. OBTAINING AN EXTRUDED NOURISHMENT FOR RED TILAPIA (Oreochromis ssp) USING FISH BIOLOGICAL SILAGE. Rev.Bio.Agro [online]. 2011, vol.9, n.2, pp.178-187. ISSN 1692-3561.

At 'La Salvajina' dam, town of Suarez (Cauca), the transformation of red tilapia (Orechromis ssp) leaves as major by-products heads, skins, bones, scales and entrails, all of which a silage process could offer a proteic alternative in the feed formulation for fish. During this present research were obtained extruded pellets for red tilapia in fattening stage, partially substituting fish flour biological silage. The pellet response variables (physical attributes) allowed, through a factorial design 23 evaluate the parameters of the extrusion process (temperature °C, screw speed rpm and humidity %). The results pointed significance from factors and interactions being the diets humidity the factor with highest incidence. The design's mid-point (MP), formulated with 15% percent offish biological silage and processed with mid-levels of the three factors (125°C, 170 rpm, 28%), showed higher than 90% percent of buoyancy, besides acceptable results in the rate of expansion, specific density, water absorption rate, water stability. As a result, favorable conditions were reached for obtaining nourishment with physical attributes similar to those of commercial nourishment.

Palavras-chave : Humidity; temperature; time of residence; screw speed.

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