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Seasonal meso- and microhabitat selection by the northern snakehead (Channa argus) in the Potomac river system

November 11, 2010

 The northern snakehead (Channa argus) is a large piscivorous fish that is invasive in eastern Europe and has recently been introduced in North America. We examined the seasonal habitat selection at meso- and microhabitat scales using radio-telemetry to increase understanding of the ecology of this species, which will help to inform management decisions. After the spawning season (postspawn season, September–November), northern snakeheads preferred offshore Eurasian water-milfoil (Myriophyllum spicatum) beds with shallow water (∼115 cm) and soft substrate. In the winter (November–April), these fish moved to deeper water (∼135 cm) with warmer temperatures, but habitat selection was weak at both scales. Northern snakeheads returned to shallower water (∼95 cm) in the prespawn season (April–June) and used milfoil and other cover. Habitat selection was the strongest at both meso- and microhabitat scales during the spawning season (June–September), when fish preferred macrophytes and cover in shallow water (∼88 cm). Our results help to identify habitats at the risk of invasion by northern snakeheads. We suggest that control efforts and future research focus on shallow waters, and take into consideration the seasonal habitat preferences.

Citation Information

Publication Year 2010
Title Seasonal meso- and microhabitat selection by the northern snakehead (<i>Channa argus</i>) in the Potomac river system
DOI 10.1111/j.1600-0633.2010.00437.x
Authors N.W.R. Lapointe, J.T. Thorson, P. L. Angermeier
Publication Type Article
Publication Subtype Journal Article
Series Title Ecology of Freshwater Fish
Series Number
Index ID 70168477
Record Source USGS Publications Warehouse
USGS Organization Coop Res Unit Leetown

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