Health

Michigan Euthanizes 31,000 Salmon Amid Bacterial Kidney Outbreak

Jun 4, 2024 1 min read

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The Michigan Department of Natural Resources (DNR) euthanized over 31,000 Atlantic salmon at the Harrietta State Fish Hatchery in Wexford County due to an outbreak of bacterial kidney disease (BKD). The disease, which causes significant mortality in trout and salmon, was confirmed by the Michigan State University Aquatic Animal Health Lab. Despite a 28-day antibiotic treatment, the fish were not feeding well and did not consume enough of the medication to eliminate the pathogen. Subsequent lab analysis showed internal signs of active disease.

BKD is believed to have contributed to the decline of Great Lakes Chinook salmon populations in the mid-1980s and is listed as a Level 1 restricted pathogen in the Model Program for Fish Health Management in the Great Lakes. The euthanized fish, approximately six inches long, were buried in a pit. The DNR stocks between 20 million and 30 million fish annually into Michigan's public waters and is undergoing infrastructure updates to address a backlog of deferred maintenance needs. Efforts are also underway to develop a vaccine to protect fish from future outbreaks. Despite this setback, the DNR continues to offer quality fishing opportunities across the state.

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