Wow...that's a neat fish, and one I've never even heard of!
So I looked it up......
http://en.wikipedia.org/wiki/Tiger_trout
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.[1] Records show instances as far back as 1944.[2]
Anyway, that's a nice catch and a beautiful fish!