Branchitis and mortality in rainbow trout <i>Oncorhynchus mykiss</i> exposed to iron oxidizing bacteria: Diagnostics and management in a Colorado hatchery
نویسندگان
چکیده
A public trout hatchery in Colorado recorded repeat episodes of morbidity and mortality early life stages Rainbow Trout (Oncorhynchus mykiss) stocks. The water source for the affected tanks is a groundwater well with pH 6.3 ferrous iron concentration 120 µg/L. Iron oxidizing bacteria (FeOB) were suspected as underlying cause due to insoluble red particulate matter (iron oxide precipitate) water, presence thick slime (biofilm) that coated pipes facility adhered gills, opercula, fins fry. On necropsy, gill fin clippings from moribund fish had mats adherent red-orange material. Histopathology revealed severe diffuse proliferative branchitis. There was abundant debris including granular sheath-like stalk-like pigmented material within oral branchial chambers, intimately associated filaments. Gram preparation demonstrated florid Gram-negative this debris. Perls’ Prussian blue colocalization iron. Bacteria identified morphologically be bacterial genera Gallionella Leptothrix. This first known report disease iron-oxidizing bacteria.
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ژورنال
عنوان ژورنال: Aquaculture, fish and fisheries
سال: 2022
ISSN: ['2693-8847']
DOI: https://doi.org/10.1002/aff2.35