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The red swamp crayfish, Procambarus clarkii, was discovered in 2007 inthe “Parc naturel régional (PNR) de la Brenne” (France). Ten colonized sites have beenidentified in the park to date, including two new sites discovered in 2011. The presentstudy aims at establishing a protocol suitable for estimating the population size ofP. clarkii by the use of a Capture-Mark-Recapture (CMR) technique in achain of five connected fish-ponds. Results show different cohorts of individuals amongseasons and fish-ponds. However, trapping effort was not efficient enough to obtain anaccurate estimate of the population size of this species in a fish-pond larger than 2 − 3ha. On the other hand, the adopted protocol appeared useful to assess, in smallerfish-ponds, the effect of intensive trapping and other control methods on P.clarkii populations

Estimating population size of the red swamp crayfish (Procambarus clarkii) in fish-ponds (Brenne, Central France)