Difference between marble trout and a crossbreed

Marble trout has nativ range within the Adriatic basin. It is caracteriezed by particular marbled patters and colour. Originaly  the marble trout is result of destinct evolutionary lineage of brown trout. In that time, marble trouts were befaving as true species. Nowadays there is the same, there where fish are still wild. 

Crossbreed is result of mating brown trout and marble trout. Its color and pattern can be pretty much varied. Hybridization betweenn marble trout and brown trout has expend so far that typical marmoratus form is consider to be very rare and one of the endangered freshwater fish in Adriatic basin. How ever crossbreed can look sometimes similar to marble trout, but not to nativ marble trout.

In Slovenia we are very proud that we still have rivers where you can find nativ marble trout. For skilled flyfisherman the nativ fish ( the fish which was produced by mating native fish) is absolutely one of the top peek of flyfishing.