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Effects of wastewater from an oil-sand-refining operation on survival, hematology, gill histology, and swimming of fathead minnows

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This study examined the effects of various types of wastewater produced in oil-sand-refining on the survival, hematology, gill morphology, and swimming of caged fathead minnows (Pimephales promelas Rafinesque, 1820). At the reference site, all fish survived a 28-day exposure with unchanged hematocrit, leucocrit, and gill histology. In contrast, all fish did not survive a 28-day period in any of the wastewaters tested and, in some cases, they had all died within 96 h. In addition, the hematology or gill morphology of fish that had survived shorter exposure durations was found to be significantly altered; the changes included a significant decrease in lymphocytes and significant gill cellular hyperplasia and hypertrophy. The present data suggest that water remediation will be needed before the process wastewater from oil-sand-refining can support fish populations.

Notre étude examine les effets d'une exposition en cages à divers types d'effluents produits lors du raffinage des sables bitumineux sur la survie, l'hématologie, la morphologie des branchies et la nage des têtes-de-boule (Pimephales promelas Rafinesque, 1820). Au site témoin, tous les poissons ont survécu à une exposition de 28 jours sans changement dans leur hématocrite, leur leucocrite et l'histologie de leurs branchies. En revanche, aucun des poissons n'a survécu 28 jours dans les divers effluents testés et, dans certains cas, tous les poissons sont morts en moins de 96 h. De plus, l'hématologie et la morphologie des branchies des poissons qui ont survécu à des expositions de plus courte durée étaient significativement altérées et les changements comprenaient un déclin significatif des lymphocytes et une hyperplasie et une hypertrophie cellulaires des branchies. Nos données indiquent qu'il faut faire un traitement pour améliorer la qualité de l'eau avant que les effluents provenant du raffinage des sables bitumineux puissent servir au maintien de populations de poissons.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: 2004-09-01

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  • Published since 1929, this monthly journal reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
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