Aquatic snails are one of the staple foods for Aussie Trout, especially in the colder months, they feed on them at all depths, even tailing on them in the extreme shallows only centremeters deep. When the fish are tailing on snails you can easily track there movement, as there tails of dorsal fins are usually waving in the air, the best method in to cast your imitation in the fishes path and let him work on to it.