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Open AccessArticle

Trap Happiness and Catch Bias in Sea Lamprey Traps

1
Biology Department, Eastern Michigan University, 441 Mark Jefferson Science Complex, Ypsilanti, MI 48197, USA
2
U.S. Fish and Wildlife Service, Marquette Biological Station 3090 Wright Street, Marquette, MI 49855-9649, USA
*
Author to whom correspondence should be addressed.
Fishes 2019, 4(2), 34; https://doi.org/10.3390/fishes4020034
Received: 15 February 2019 / Revised: 28 May 2019 / Accepted: 29 May 2019 / Published: 12 June 2019
Sampling fish by trapping can lead to biased conclusions about a population. We used catch data to assess differences between two types of traps for adult sea lamprey (Petromyzon marinus), submerged-funnel traps and studded-tile traps, which are angled ramps with trickle flow leading out of the water. The studded-tile trap at one river caught about 50% more females than the funnel trap. It caught males that had a smaller body size and females with a lower gonado-somatic index (GSI). The likelihood of catching lamprey in the studded-tile trap increased after they had been caught once. This was not the case for the funnel traps, which are used for mark–recapture-based population assessment of invasive sea lamprey in the Great Lakes. The apparent trap response caused by studded-tile traps may have been caused by a behavioral bias, i.e., the traps consistently attracting a subset of the population. Use of the studded-tile trap for population assessment should only be considered after more is known about its recapture bias. The differences between lamprey caught in the two trap types suggests that a variety of trapping methods needs to be employed in order to get a representative sample from a fish population. View Full-Text
Keywords: gear selectivity; trapping bias; trap happiness; sex bias; sea lamprey; invasive species; fish passage gear selectivity; trapping bias; trap happiness; sex bias; sea lamprey; invasive species; fish passage
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Reinhardt, U.G.; Hrodey, P.J. Trap Happiness and Catch Bias in Sea Lamprey Traps. Fishes 2019, 4, 34.

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