Marble trout has cylindrical shaped long, lean body. For it’s very large head, who takes up around ¼ of the entire body, it has pretty small eyes. Dorsal fin is also relatively short. It has strong mouth with many sharp teeth. Males can be distinguished from females by the conclusion of the lower jaw, which is directed downwards in males and is straight in females.
Marble trout has distinct body pattern, with the olive-green colour being dominant over black, which we can see on top of the head and upper side of the body. Downward from the head to the belly, green mixes with light black, the two colors interweaving along the way, creating a special, marble-like pattern that is distinctive for this species. Hence the name Marble trout (Salmo marmoratus in Latin).
Marble trout also has some greenish-black dots, easily seen on the dorsal fin. In females, red dots can also be spotted.
Marble trout reaches maturity in the 4th year. Spawning time is relatively short, usually from start of December until the start/ middle of January. The most active spawning time is in the evening and during the night.