Tiger trout are a hybrid between a female brown trout and a male brook trout. They are greenish yellow to brown with dark patches along their sides creating a maze-like pattern. Their belly is yellowish orange and the tail fin is square. The name derives from the pronounced vermiculations, which evoke the stripes of a tiger. The fish is an anomaly in the wild, with the brook trout having 84 chomosomes and the brown trout 80. The cross itself is unusual in that the parents are members of different.