Pond Boss Forums MANAGING AN EXISTING POND Evaluating and adjusting fish populations Where are the gills, and perch ?

I have a 3/4 acre pond here I'n Wi, that's 18 feet deep. Small spring feeds pond... I can't catch a bluegill or perch to save my life! I know there was 40 to 60 perch 10-12 inches last fall and 40 to 50 large gills I'n there I'n fall.the only fish I have caught have been a 4 lb smb, and a 3 lb lmb. Theres thousands of minnows that hold very tight to shore when it's sunny out, not many weeds I'n pond yet. Is there a chance I had a winter kill on the panfish? Also as of now surface water temp is 54.3, and water temp of spring entering is 46.2.