Salmo trutta m. fario L./ was successful for optimize crossbreeding. It is also threatened by introduced predatory fish such as the brown trout ("Salmo trutta"). Scottish authorities currently do not regard Scottish ferox to be taxonomically distinct from "Salmo trutta". There is also a small run of Sea Trout (migratory Salmo trutta) into the river. Damavand rivers and slopes are famous for brown trout ("Salmo trutta"). In popularity, it is followed by the Brown trout ("Salmo trutta"). When in shared breeding habitats, Atlantic salmon will hybridize with brown trout ("Salmo trutta"). Brown trout ("Salmo trutta fario") was first introduced in Bhutan in 1930. The scientific name of the brown trout is "Salmo trutta". The Truckee also boasts a healthy, self-sustaining non-native Brown trout ("Salmo trutta") population. A certain percentage of brown trout ("Salmo trutta") from that river have a marble pattern. Fishing (under permit) is generally for rainbow ("Oncorhynchus mykiss") and brown trout ("Salmo trutta"). Traditionally salmonidae (Salmo trutta) and Dinnawah snowtrout (Schizothorax progastus) was found in the Ha Chhu.