If its a smaller stream, their runs are usually up the middle. Cut a hole thru the ice and if its not too deep you can lay on the ice and look down and see the "channel" they travel thru. Put a 330 on a holder or wired to 2 dead poles and stick it in the middle of the run. You'll get them that way. Some guys put 1/2" diameter green sticks on the trigger of a 330 and get them that way too. Hope it helps.