Testing shows Mt. Shasta Hatchery parasite confined to small group of fish

Sep 10, 2015 2:09 PM by News Staff

A possibly fatal disease that led to more than 3 million North State trout being quarantined is less prevalent than initially thought, test results have confirmed.

Results from comprehensive testing at Mt. Shasta Fish Hatchery show the whirling disease parasite initially thought to have infected 1.1 million trout is confined to a smaller group of fish than originally assumed. As a result, the California Department of Fish and Wildlife will lift quarantine and resume operations at the Mt. Shasta Hatchery.

The recent test results indicate that only 2,500 fish need to be euthanized to curb spread of the disease.

Whirling disease is a parasite that destroys cartilage on the vertebrae of trout and salmon. It can be fatal to fish, but does not affect humans or other wildlife.


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