The tiger trout (Salmo trutta X Salvelinus fontinalis) is a sterile, intergeneric hybrid of the brown trout (Salmo trutta) and the brook trout (Salvelinus fontinalis). The name derives from the pronounced vermiculations, evoking the stripes of a tiger. It is a rare phenomenon in the wild, with the brook trout having 84 chromosomes and the brown trout 80. Records show instances as far back as 1944.Tiger trout can be produced reliably in hatcheries. This is done by fertilizing brown trout eggs with brook trout milt and heat shocking them, which causes creation of an extra set of chromosomes and increases survival from 5% to 85%. Tiger trout have been reported to grow faster than natural species, though this assessment is not universal, and they have been widely stocked for sport fishing.
Tiger trout are known to be highly piscivorous (fish-eating), and are a good control against rough fish populations. This makes tigers popular with many fish stocking programs, such as with the Utah Division of Wildlife Resources. Their own population numbers can be tightly controlled as well, since they are sterile.
Many states have had stocking programs for tiger trout. Wisconsin discontinued its program in the late 1970s. Tigers were exclusively stocked in the Great Lakes. After the stocking program was discontinued, a 20-pound-plus world-record tiger was caught in the Great Lakes. I guess the "Chuffed Trout" just doesnt sound right.