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1 May 2010 Swimming Performance of Larval Pacific Lamprey (Lampetra tridentata)
Zachary A. Sutphin, Charles D. Hueth
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Laboratory experiments were conducted to measure the prolonged-sustained and burst swimming speeds of wild larval (ammocoete) Pacific lamprey (Lampetra tridentate). Prolonged-sustained speeds were measured using an annular variable speed swimming chamber and burst speeds were determined using a swimming raceway and digital video analysis. During prolonged-sustained swimming experiments, the mean length of time lamprey (72 – 143 mm TL) were able to swim in the chamber ranged from 43.0 min when exposed to a velocity of 10 cm/s, to 0.4 min when exposed to 50 cm/s. The burst swimming speeds of lamprey tended to increase as length increased from 107 to 150 mm TL, and ranged from 33.3 to 75.0 cm/s. Our estimates of the overall swimming performance of this life-stage are the first reported for this species, and can provide important information when developing approach velocities and infrastructure to improve lamprey passage while minimizing entrainment loss.

Zachary A. Sutphin and Charles D. Hueth "Swimming Performance of Larval Pacific Lamprey (Lampetra tridentata)," Northwest Science 84(1), 196-200, (1 May 2010).
Received: 30 October 2009; Published: 1 May 2010

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