Extant because important or important because extant? On the scientific importance and conservation of a genetically pure Sicilian population of the threatened Salmo cettii Rafinesque, 1810
This paper reviews the research on the Tellesimo Stream trout population, which was first described and recognized as scientifically important 30 years ago, when its main threats were identified for the first time. Protection against introgression, and possibly even the current existence of this population, appears to be the result of protection and conservation measures that were implemented soon after this research. The possible distinction between Sicilian and other Italian trout was first suggested by a genetic study carried out about 20 years ago, which found that the trout population of Tellesimo clustered separately from all other salmonids analysed.