Variation of agonistic behavior among juvenile Chinook salmon (Oncorhynchus tshawytscha) of hatchery, hybrid, and wild origin

摘要: Agonistic behavior and ability to dominate were compared among juveniles from a hatchery stock of Chi- nook salmon (Oncorhynchus tshawytscha) that has experienced five generations culture, derived the wild founding but produced parents cultured in same environment as stock, second-generation hybrids between two lines. Equal numbers parr (18) equal fami- lies (5) each fish line (3) tested, all lines raised similar environment. During 20 min observation replicate artificial stream tanks, hatchery-derived made significantly greater charges, displays, nips than wild-derived fish. Hybrids also fewer displays No difference was detected win dyadic dominance contests. These results suggest differences are ge- netic origin consistent with divergence stock. Resume : Nous avons compare le comportement agoniste et l'habilete dominer chez des jeunes d'un de pisci- culture saumons quinnat qui connu cinq d'elevage en pisciculture, issus du fondateur sauvage, mais nes eleves dans meme milieu pisciculture que hybrides seconde generation deux lignees. evalue nom- bres egaux tacons nombre familles chaque lignee poissons toutes les lignees ont ete elevees un environnement pisciculture. Lors d'observations bassins artificiels ap- paries, provenant la font significativement plus d'avancees, prises position bravade picotages sauvage. Les aussi d'origine moins pri- ses Il n'y pas entre differentes gagner epreuves dyadiques dominance. Ces resultats laissent croire observees sont genetique qu'elles s'accordent avec une partir (Traduit par Redaction) Wessel al. 447