Self-feeding ability of farm-reared native mediterranean and atlantic brown trout juveniles into artificial system | Capacidad de búsqueda de alimento en canales seminaturales de juveniles de trucha común autóctona de origen mediterráneo y de stocks alóctonos criados en cautividad
2011
Mitjana, O., Universidad de Zaragoza (España). Facultad de Veterinaria | Alabart, J.L., Centro de Investigación y Tecnología Agroalimentaria de Aragón, Zaragoza (España) | Clavero, J.L., Diputacion General de Aragon, Zaragoza (España). Dirección General del Medio Natural | Blasco, J.M., Centro de Investigación y Tecnología Agroalimentaria de Aragón, Zaragoza (España) | Josa, A., Universidad de Zaragoza (España). Facultad de Veterinaria | Espinosa, E., Universidad de Zaragoza (España). Facultad de Veterinaria
Stocked brown trouts have reduced ability to obtain food resulting in reduced survival rates. Adaptation to natural environments of farm-reared fishes becomes crucial early after restocking. The aim of this work was to evaluate the self-feeding ability of different strains of juvenile brown trout placed at different densities and in presence or absence of predators. Three different strains of juvenile brown trout were placed for 3 weeks into seminatural ponds at two stocking densities, and in presence/absence of predators. Predators were adult mature trouts stocked prior introducing juveniles. An Atlantic strain from domestic origin was used as control. F2 juveniles from two different native Mediterranean brown trout populations were also used. The presence of food in stomach contents was assessed after necropsy. Feeding ability was decreased in presence of predators and high juvenile densities with important differences among trout strains.
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