Abstract
We describe an effective device for sampling for the larvae of sea lampreys Petromyzon marinus in waters too deep to wade and sample with backpack electrofishing equipment (> 1 m). The sampler uses electricity to stimulate emergence of larvae from the substrate and a pump to move them to the surface for collection. Capture efficiency was negatively related to larval length, but it seems possible to correct population density estimates to account for this factor if length data are collected from the catch.
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