stalking prey isn't necessarily ambush predation...however, i believe gars (as with many fishes) are capable of using multiple tactics in prey capture including ambush predation and active hunting. the YOY of the year fish will often lie in wait and snatch food as it comes by, but these fish will also actively chase down prey. the main issue is that they are often pigeon-holed into one category when this isn't the case--
--solomon