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Whirling disease, a condition caused by a non-native microscopic parasite, affects fish in the trout and salmon family, including rainbow, brook and brown trout. This parasite can cause damage to the fish’s cartilage and skeletal tissue, resulting in deformities in the head and spine. They may also develop a black tail or display “whirling” or erratic tail-chasing behavior

Whirling disease, a condition caused by a non-native microscopic parasite, affects fish in the trout and salmon family, including rainbow, brook and brown trout. This parasite can cause damage to the fish’s cartilage and skeletal tissue, resulting in deformities in the head and spine. They may also develop a black tail or display “whirling” or erratic tail-chasing behavior