Current state of knowledge on Louisiana crawfish (Procambarus clarkii Girard, 1852) in Morocco.
In Morocco, the Louisiana crawfish (Procambarus clarkii) was illegally introduced in the late 90s/early 2000s by the willful release of young specimens into the Nador Canal in the Gharb region and in the Low Loukkos Marshes in the Larache region. This introduction has been carried out in both regions by an owner of an eel farm in the small town of Mehdia. Currently, P. clarkii is present in almost every body of water in these regions and constitutes a stock estimated at respectively 60.39 tons in the Gharb and 30.33 tons in the Low Loukkos Marshes. These populations are between 80 and 110 mm in length with an average weight of 32.12 grams in the Gharb region, and between 60 and 100 mm in size with an average weight of 14.3 grams in the Low Loukkos Marshes. The comparison with a previous study in 2015 showed no significant change in the distribution of size and weight classes of the Gharb population relative to the present 2017 study.