Myxobolus cerebralis

Dead crappie and blue gill. Rotenone treatment of Pine Mountain Lake near Groveland to kill trout with whirling disease, Sep 1984 (26584154410)
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CaliforniaDFW|sourceurl=https://flickr.com/photos/41723647@N08/26584154410%7Carchive=https://web.archive.org/web/20200429162254/https://flickr.com/photos/41723647@N08/26584154410%7Creviewdate=2018-05-17 14:50:53|reviewlicense=cc-by-2.0|reviewer=FlickreviewR 2] Wikimedia Commons
Description: Dead crappie and blue gill. Rotenone treatment of Pine Mountain Lake near Groveland, Tuolumne County, to kill trout with whirling disease, Sep 1984. CDFW file photo. Date: 19 April 2016, 13:56. Source: Dead crappie and blue gill. Rotenone treatment of Pine Mountain Lake near Groveland to kill trout with whirling disease, Sep 1984. Author: California Department of Fish and Wildlife from Sacramento, CA, USA.
Applying rotenone at Pine Mountain Lake to kill trout with whirling disease, Sep 1984 (26251614054)
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CaliforniaDFW|sourceurl=https://flickr.com/photos/41723647@N08/26251614054%7Carchive=https://web.archive.org/web/20200407125125/https://flickr.com/photos/41723647@N08/26251614054%7Creviewdate=2018-05-17 14:50:56|reviewlicense=cc-by-2.0|reviewer=FlickreviewR 2] Wikimedia Commons
Description: Applying rotenone at Pine Mountain Lake to kill trout with whirling disease, Sep 1984. Date: 19 April 2016, 13:56. Source: Applying rotenone at Pine Mountain Lake to kill trout with whirling disease, Sep 1984. Author: California Department of Fish and Wildlife from Sacramento, CA, USA.