Tiger trout (Salvelinus fontinalis x Salmo truttais) descriptive not only of the color of this hybrid but of its disposition. The tiger trout is a cross between the female brown trout and the male brook trout. The progeny from this cross have tigerlike markings on their sides and are more aggressive than the parent species. Unfortunately, only about 35 percent of the young are able to develop because of a disease which is inherent in the sac fry. Occasionally this cross occurs in nature, but the fish are unable to reproduce because they are not fertile. Tiger trout have been produced on a small scale in private hatcheries and stocked in various club waters, where they are considered a fine game fish. Although tiger trout look like males, they are sterile. Charles Krueger, from Cornell University, states in the book, Trout, that the "infertility of the tiger trout may be caused by the dissimilarity between the chromosome numbers of the two parent species." Brook trout have 84 chromosomes and browns have 80. While most Tiger Trout are artificially raised there are some to be found in the wild as well. Any combo wild Brook trout/Wild Brown trout Stream could have a wild tiger trout in it but very rare to find.

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