An Electric Beam Trawl for the Capture of Larval Lampreys
- 1 July 1968
- journal article
- research article
- Published by Oxford University Press (OUP) in Transactions of the American Fisheries Society
- Vol. 97 (3) , 289-293
- https://doi.org/10.1577/1548-8659(1968)97[289:aebtft]2.0.co;2
Abstract
A small electric beam trawl was developed to locate and assess populations of larval sea lampreys (Petromyzon marinus) inhabiting inland lakes, and estuaries and bays of the Great Lakes. The towing bridle of the sled-mounted net incorporates an electrode array that is energized with square-wave pulses of direct current (duration of 166 milliseconds at 3 pulses per second). Tests indicated that this type of electric current caused most lamprey larvae to emerge from their burrows within 7 sec. When power of only 300 watts was applied to the electrode array, the trawl caught more than 15 lamprey larvae per min. where large populations were present. In addition to sea lamprey larvae, 26 other species of fish (including 3 species of native lampreys) were captured by the trawl. Although the trawl is not designed to take fish, small species that dwell on the bottom are vulnerable to it.This publication has 1 reference indexed in Scilit:
- A Modified Anchor Dredge For Collecting Burrowing AnimalsJournal of the Fisheries Research Board of Canada, 1960