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Recurrent amoebic gill infestation in rainbow trout cultured in a semiclosed water recirculation system

Journal of Aquatic Animal Health

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Abstract

Five lots of commercially purchased juvenile rainbow trout Oncorhynchus mykiss (17-44 g) stocked in a continuous-production water recirculation system became infested with gilt amoebae. The amoebae were introduced into the recirculation system, as evidenced by their presence on gills of fish held in quarantine tanks. Based on their morphology, as seen in histological sections and by electron microscopy, the amoebae appeared to be more closely related to the family Cochliopodiidae than to other taxa of free living amoebae. Attempts to culture the amoebae in different media, at different temperatures of incubation, and in fish cell culture were not successful. Initial treatment of the recirculation system with formalin at 167 parts per million (ppm) for 1 h eliminated amoebae from the gills. Subsequent treatments of the entire system with formalin at 50-167 ppm reduced the intensity of further infestations.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Recurrent amoebic gill infestation in rainbow trout cultured in a semiclosed water recirculation system
Series title:
Journal of Aquatic Animal Health
Volume
9
Issue:
1
Year Published:
1997
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of Aquatic Animal Health
First page:
64
Last page:
69
Number of Pages:
6