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Comparisons between hatchery and wild steelhead trout (Oncorhynchus mykiss) smolts: physiology and habitat use

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Abstract:

Hatchery steelhead trout (Oncorhynchus mykiss) smolts, progeny of a newly founded native origin broodstock, were released into Abernathy Creek, Washington, in 2003 and 2004. After release, saltwater tolerance, gill Na+,K+-ATPase activity, and habitat use were compared. A subsample of hatchery and wild steelhead trout were implanted with 23 mm passive integrated transponder (PIT) tags each year. PIT-tagged migrants were used for physiological comparisons. Hatchery fish were significantly larger than wild fish. Hatchery migrants expressed significantly lower levels of gill Na+,K+-ATPase activity than wild migrants. After a 24 h seawater challenge, hatchery migrants had significantly higher plasma osmolality and [Na+] than wild migrants. Microhabitat use of PIT-tagged hatchery and wild individuals in a control (wild fish only) and effect (hatchery and wild fish) site were compared before and after the introduction of hatchery fish. No difference was detected in hatchery and wild smolt habitat use. Wild fish did not change their habitat use after the introduction of hatchery fish. Although hatchery and wild fish differed in smolt physiology, differences in short-term use of freshwater habitat were not detected, and hatchery fish did not appear to displace wild fish.

Des saumoneaux de truites arc-en-ciel anadromes (Oncorhynchus mykiss), issus d'une nouvelle souche reproductive indigène et élevés en pisciculture, ont été relâchés dans Abernathy Creek, Washington, en 2003 et 2004. Après la libération des poissons, nous avons comparé la tolérance à l'eau de mer, l'activité de la Na+,K+-ATPase des branchies et l'utilisation de l'habitat. Les deux années, nous avons implanté des étiquettes PIT (transpondeurs passifs intégrés) de 23 mm dans un sous-échantillon de truites arc-en-ciel de pisciculture et de truites sauvages. Les migrateurs munis de PIT nous ont permis de faire des comparaisons physiologiques. Les poissons de pisciculture sont significativement plus grands que les poissons sauvages. Les migrateurs de pisciculture exhibent des niveaux significativement plus bas d'activité de la Na+,K+-ATPase branchiale que les migrateurs sauvages. Après une exposition de 24 h à l'eau salée, les migrateurs de pisciculture ont une osmolalité plasmatique et une concentration de [Na+] significativement plus élevées que les migrateurs sauvages. Nous avons comparé l'utilisation des microhabitats chez des poissons porteurs d'étiquettes PIT de pisciculture et d'origine sauvage dans des sites témoin (poissons sauvages seul) et expérimental (poissons d'élevage et d'origine sauvage) avant et après l'introduction des poissons de pisciculture. Il n'y a pas de différence d'utilisation de l'habitat entre les saumoneaux de pisciculture et les saumoneaux sauvages. Les poissons sauvages ne changent pas leur utilisation de l'habitat après l'introduction des poissons de pisciculture. Bien que la physiologie des saumoneaux soit différente chez les poissons de pisciculture et les poissons sauvages, nous ne détectons aucune différence à court terme de l'utilisation de l'habitat d'eau douce et les poissons d'élevage ne semblent pas déplacer les poissons sauvages.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: July 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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