Perch don’t actually spawn until the ice is out. The water temp. needs to be between 45 and 55 degrees so they will usually spawn in 6 feet of water or less which will be the warmest water on the lake. The actual spawning process usually happens at night or early in the moring. Perch are unique in that they need to deposit there eggs, which come out of the female in long coiled strings, on verticle stucture, preferably weeds. In lakes that don’t have weeds, perch will lay there eggs on the bottom of the lake, but the eggs have very little chance of hatching due to being covered in sediment and washing up on shore. This is why some lakes, particularly in the glacial Dakota lakes, have such erratic perch reproduction. During drought years, there is no vegetation resulting in little or no perch reproduction.