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ABSTRACT - The presence of two species of brook lampreys, genus lchtbyomyzon, in Minnesota was confirmed. The northern brook lamprey (1 f ossor) occurs in the Blackhoof River of the lake Superior drainage. The southern brook lamprey (1 gagei)was found in the St. Croix River drainage above Taylors Falls. At least three microhabitats are used by 1 gagei during its life cycle. Adults prior to spawning are found in crevices beneath boulders in deep, fast water; spawning is associated with gravel substrate at the head of riffies; and larvae burrow in fine substrate in quiet water. The reproductive biology of 1 gagei in Minnesota is similar to that of conspecifics in the southern part of its range.

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