Freshly stocked trout can be terribly easy to catch. But after a few years, the survivors—now adult brookies, rainbows, and cutthroats marked with artfully brilliant colors—can be downright frustrating to figure out. But here we go.

Fickle trout behavior is linked to food preferences and availability. When trout stretch between 14 and 16 inches, they make a switch to larger food bites, like small fish, baitfish, and crustaceans. The larger forage yields greater rewards per unit of expended energy, as well as less risk of exposing themselves to predators.

This biological big-food factoid doesn’t mean you can get away with gaudy, mechanical presentations. Jigging spoons or swimming lures such as the Jigging Rapala occasionally account for a few big browns and ‘bows. But over a 20-year period, nearly every large trout I’ve taken through the ice has been owed to finessing earth-toned micro jigs.

In winter, large food items become relatively scarce. And in many waters, particularly less fertile environments with smaller littoral areas, zooplankton is a trout’s primary food source, often comprising up to 98 percent of its wintertime diet. For instance, one study in Minnesota found that the average size of Daphnia pulex in a lake measured 1.6 mm, while the average size of the specimens in trout stomachs was 2.2 mm.

Despite the sharp visual acuity of trout, anglers are better served employing a general imitative presentation—to mimic a single microscopic Daphnia pulex would be a daunting task. Besides, we also know trout select for the largest individuals of the micro species, making it impractical and unnecessary to attempt to match the hatch, here.

A tiny, solid-colored hair or tube jig makes a nice meal that trout can neither comprehend nor reject, something like a glow-white micro-tube jig tipped with a single golden mealworm (trout love mealworms). Coupled with a wispy 2-pound monofilament, this combo becomes a single morsel of food that larger trout eat.

Another sweet trout bait is a 1/64-ounce black jighead dressed with black chenille and less than a dozen fine wisps of black marabou, all wrapped with black floss and no more than 1 inch long. It’s a deadly combination that can be dropped to the level of the fish and simply left to wave, triggering even the most discriminating trout.

Enticing large selective trout may require just the right jig quiver or two at precise moments. These aren’t the constant nervous wrist shakes panfish anglers know so well. Rather, it’s a well-timed quiver or two, best executed with an index finger gently feathering and strumming the line.

Sometimes the wisest jig move is no move at all. Do the wrong thing at the wrong time, or even the right thing at the wrong time, and a mature trout pondering your jig is bound to wise up and flee the scene. No worries. That’s trout angling. When one fish leaves, another is bound to appear.

*Freelance writer Cory Schmidt has been writing for In-Fisherman publications for almost 15 years.