Clifford L. Brynildson
Vernon C. Applegate
1951
<div class="paragraph">In order to obtain more precise information concerning the downstream movement of recently transformed sea lampreys, a trapping device was operated in the Carp Lake River, Emmet County, Michigan, from October, 1948, to July, 1951.</div>
<div class="paragraph">The period of downstream migration typically extends from the latter part of October to the middle of April. It varies, however, from year to year with climatic conditions. A few migrants usually appear every day during this period but a sudden increase in water level is characteristically accompanied by a surge in downstream movement of newly transformed sea lampreys. This phenomenon is realized principally during the spring floods and often concurrently with autumn rains and mid-winter thaws.</div>
<div class="paragraph">A total of 7,969 downstream migrants were taken in the 1948–49 season; 16,235 in 1949–50, and 15,103 in 1950–51. Measurements of representative samples from the total catch of sea lamprey migrants of the 1948–49 and 1949–50 seasons revealed a range in length of 95 to 190 millimeters and an average length of 145 millimeters (3.7 to 7.5 inches; mean –5.7 inches).</div>
application/pdf
10.1577/1548-8659(1951)81[275:DMORTS]2.0.CO;2
en
Taylor & Francis
Downstream movement of recently transformed sea lampreys, Petromyzon marinus, in Carp Lake River, Michigan
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