A comparison of two gears for quantifying abundance of lotic-dwelling crayfish

Journal of Crustacean Biology
Oklahoma Cooperative Fish and Wildlife Research Unit
By: , and 

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Abstract

Crayfish (saddlebacked crayfish, Orconectes medius) catch was compared using a kick seine applied two different ways with a 1-m2 quadrat sampler (with known efficiency and bias in riffles) from three small streams in the Missouri Ozarks. Triplicate samples (one of each technique) were taken from two creeks and one headwater stream (n=69 sites) over a two-year period. General linear mixed models showed the number of crayfish collected using the quadrat sampler was greater than the number collected using either of the two seine techniques. However, there was no significant interaction with gear suggesting year, stream size, and channel unit type did not relate to different catches of crayfish by gear type. Variation in catch among gears was similar, as was the proportion of young-of-year individuals across samples taken with different gears or techniques. Negative binomial linear regression provided the appropriate relation between the gears which allows correction factors to be applied, if necessary, to relate catches by the kick seine to those of the quadrat sampler. The kick seine appears to be a reasonable substitute to the quadrat sampler in these shallow streams, with the advantage of ease of use and shorter time required per sample.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title A comparison of two gears for quantifying abundance of lotic-dwelling crayfish
Series title Journal of Crustacean Biology
DOI 10.1163/1937240X-00002212
Volume 34
Issue 1
Year Published 2014
Language English
Publisher Crustacean Society
Publisher location Washington, D.C.
Contributing office(s) Coop Res Unit Atlanta
Description 7 p.
First page 54
Last page 60
Online Only (Y/N) N
Additional Online Files (Y/N) N
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