Based on work undertaken at Sparsholt College, Hampshire; the Hutchings refuge trap can be used in areas where water voles and otters are present. A very simple structure with no bait, the trap can be left in place for some time. It works on the preference of crayfish for tunnels and, with the variety of tunnel sizes offered, a variety of sizes are captured. This trap will give a reliable indication of the population structure.
Refuge traps should be placed within shaded areas of suitable habitat at the edge of the stream or water body and angled as close to horizontal as possible and perpendicular to the flow of water so that the crayfish don't get washed out or become trapped by the flow of water. If the traps are being used to survey for the native white-clawed crayfish then the traps should be used between the beginning of July and the end of September, if surveying for non-native crayfish then they can be deployed between April and October. People surveying for native crayfish must have the appropriate Natural England licence. Traps should be washed with disinfectant between uses in different watercourses,
* Tunnel widths: 50mm, 40mm, 20mm x 2, 15mm x 2
* Width: 200mm
* Depth (i.e. length of tunnels): 150mm
Material: heavy and long lasting plated steel.
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