Skip to main content

Metabolic rates and swimming performance of adult Fraser River sockeye salmon (Oncorhynchus nerka) after a controlled infection with Parvicapsula minibicornis

Buy Article:

$50.00 plus tax (Refund Policy)

Abstract:

Adult sockeye salmon (Oncorhynchus nerka) acquire infections with the myxosporean kidney parasite Parvicapsula minibicornis during their spawning migration in the Fraser River, British Columbia. Controlled infections with this parasite in wild sockeye salmon had no significant impact on plasma ionic status, metabolic rates, and initial maximum prolonged swimming performance (Ucrit) for fish ranked as either strongly, weakly, or noninfected by polymerase chain reaction analysis of kidney tissue. However, strongly infected fish had significantly lower second Ucrit and recovery ratio (8%) values, indicating decreased ability to recover from exercise. As the present study shows that the severity of infection is affected by time and temperature, the accumulated thermal units (ATU) of exposure in this study were compared with those experienced by naturally migrating sockeye salmon. A parallel telemetry study revealed that early-timed sockeye experienced significantly more ATU (741.4 ± 29.4 °C) than normally migrating salmon (436.0 ± 20.0 °C) prior to spawning because of a significantly longer holding period in the lake system. The present data are discussed in the context of a threshold of >450 °C ATU for severe infection that would first manifest in early-timed fish in the upper reaches of the Fraser River and certainly on the spawning grounds.

Les saumons rouges (Oncorhynchus nerka) attrapent des infections à Parvicapsula minibicornis, une myxosporidie parasite du rein, durant leur migration de fraye dans le Fraser, Colombie-Britannique. Des infections contrôlées de ce parasite chez les saumons rouges sauvages restent sans effet sur le statut ionique du plasma, les taux métaboliques et la performance initiale maximale de nage soutenue (Ucrit) chez des poissons classés comme fortement, légèrement ou aucunement infectés par une analyse de la réaction en chaîne de la polymérase de leurs tissus rénaux. Cependant, les poissons fortement infectés ont un Ucrit secondaire et des valeurs du rapport de récupération (8 %) significativement plus faibles, ce qui indique une capacité réduite à récupérer après l'exercice. Puisque notre étude montre que la sévérité de l'infection est affectée par le temps et la température, nous avons comparé les unités thermiques cumulées (ATU) de l'exposition durant notre étude à celles subies par des saumons durant leur migration naturelle. Une étude de télémétrie faite en parallèle montre que les saumons précoces accumulent significativement plus de ATU (741,4 ± 29,4 °C) que les saumons à migration normale (436,0 ± 20,0 °C) avant la fraye, à cause d'une période significativement plus longue de rétention dans le système de lacs. Nous discutons de nos données dans le contexte d'un seuil de > 450 °C ATU pour une infection sévère qui se manifesterait d'abord chez les poissons précoces dans le cours supérieur du Fraser et certainement sur les sites de fraye.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: 2005-09-01

More about this publication?
  • 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.
  • Information for Authors
  • Submit a Paper
  • Subscribe to this Title
  • Terms & Conditions
  • Sample Issue
  • Reprints & Permissions
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free ContentFree content
  • Partial Free ContentPartial Free content
  • New ContentNew content
  • Open Access ContentOpen access content
  • Partial Open Access ContentPartial Open access content
  • Subscribed ContentSubscribed content
  • Partial Subscribed ContentPartial Subscribed content
  • Free Trial ContentFree trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more