Splake This fast-growing brook trout/lake trout hybrid is a good fighting fish that prefers colder water like lake trout do. You may be able to reach this fish with conventional or fly tackle in the spring or fall when shallow water temperatures are more conducive. Splake are predators and feed on other small fish in the lake. Many of the same techniques and strategies used on lake trout and brook trout will be effective when fishing for splake. It is difficult to tell the difference between a splake and a lake trout. The most telling signs are that splake have a tri-colored ventral fin, which are the fins beneath the belly, and it has a semi-forked tail unlike the square tail of a brook trout or a deep-forked tail of a laker.