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Providing evidence to improve practice

Individual study: Effectiveness of dam construction to contain the invasive crayfish Procambarus clarkii in a Mediterranean mountain stream

Published source details

Dana E.D., García-de-Lomas J, González R & Ortega F (2011) Effectiveness of dam construction to contain the invasive crayfish Procambarus clarkii in a Mediterranean mountain stream. Ecological Engineering, 37, 1607-1613


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Procambarus crayfish control: Create barriers Control of Freshwater Invasive Species

A before-and-after study from 2007 to 2010 in a mountain stream in Italy (Dana et al. 2011) found that building a series of small dams stopped migration of the red swamp crayfish Procambarus clarkii. The invasive crayfish did not penetrate into previously uninhabited areas upstream beyond the lower dams. In addition, numbers dropped below detectable levels in previously occupied areas in the mid reaches between dams. Dams were 1.5–2 m high and 6 m wide and constructed from reinforced concrete. Several design features discouraged crayfish from climbing over including vertical walls, smooth mortar, vertical wing-walls 3.5 m along the banks, and a projecting rim (crayfish are unable to walk upside down on a smooth surface). A flat stony platform was built downstream of each dam to create a shallow area with no refuges, discouraging crayfish from lingering near the dam. Crayfish populations were monitored for 30 days between July and October each year.