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

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Abstract:

Agonistic behavior and ability to dominate were compared among juveniles from a hatchery stock of Chinook salmon (Oncorhynchus tshawytscha) that has experienced five generations of hatchery culture, juveniles derived from the wild founding stock but produced from parents cultured in the same hatchery environment as the hatchery stock, and second-generation hybrids between the two lines. Equal numbers of parr (18) from equal numbers of families (5) from each fish line (3) were tested, and all lines were raised in a similar hatchery environment. During 20 min of observation in replicate artificial stream tanks, hatchery-derived fish made significantly greater numbers of charges, displays, and nips than wild-derived fish. Hybrids also made significantly greater numbers of charges, displays, and nips than wild-derived fish but significantly fewer displays than hatchery-derived fish. No difference was detected in the ability of fish lines to win dyadic dominance contests. These results suggest that the differences detected are genetic in origin and are consistent with divergence of the hatchery stock from the founding wild stock.

Nous avons comparé le comportement agoniste et l'habileté à dominer chez des jeunes d'un stock de pisciculture de saumons quinnat (Oncorhynchus tshawytscha) qui a connu cinq générations d'élevage en pisciculture, chez des jeunes issus du stock fondateur sauvage, mais nés de parents élevés dans le même milieu de pisciculture que le stock de pisciculture et chez des hybrides de seconde génération issus des deux lignées. Nous avons évalué des nombres égaux de tacons (18) d'un même nombre de familles (5) de chaque lignée de poissons (3) et toutes les lignées ont été élevées dans un même environnement de pisciculture. Lors d'observations de 20 min dans des bassins artificiels appariés, les poissons provenant de la pisciculture font significativement plus d'avancées, de prises de position de bravade et de picotages que les poissons issus du stock sauvage. Les hybrides font aussi significativement plus d'avancées, de prises de position de bravade et de picotages que les poissons d'origine sauvage, mais significativement moins de prises de position de bravade que les poissons de pisciculture. Il n'y a pas de différence entre l'habileté des différentes lignées de poissons à gagner des épreuves dyadiques de dominance. Ces résultats laissent croire que les différences observées sont d'origine génétique et qu'elles s'accordent avec une divergence du stock de pisciculture à partir du stock fondateur sauvage.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: February 1, 2006

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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