Seasonal Lake Turnover

Seasonal Turnover refers to the exchange of surface and bottom water in a lake or pond. This annual recycling program happens twice a year. There's spring turnover and fall turnover and summer stagnation in between. From spring to fall, warmer water goes from the top of the lake to the bottom and cooler water moves from the bottom to the top.

Summer Stagnation
During the summer, the sun heats water near the surface of lakes, but it doesn't sink. Eventually a condition known as "stratification" develops, putting a well-defined warm layer of water over a cool one. Fish like the cooler water but they also need the higher oxygen levels found in warmer water So they'll migrate to an area right between the two levels of water called the thermo cline. The thermo cline can occur between 2 and 10 feet in depth, depending on the size of the lake. It's best to find a point or some other form of structure that extends out from the shoreline and slopes gradually down into the thermo cline. This should be a place where fish can find warmer water but have quick access to deeper, cooler and safer water.

Fall Turnover
With the arrival of fall and cooler air temperatures, water at the surface of lakes cools, becoming almost as heavy as the cooler bottom water Strong autumn winds move surface water around, which promotes mixing with deeper water This is fall turnover. As mixing continues, lake water becomes more uniform in temperature and oxygen level, allowing fish to move around freely. Fish can be difficult to find as long as these conditions prevail, usually continues until the weather turns cold, chilling the lake's surface.

Water Temperature and Turnover
Each fish has a different range of water temperature in which it can survive. Although fish cannot always find the exact temperature they prefer, they are usually found in water close to that temperature. By combining a knowledge of preferred water temperature and lake turnover, you can kind-of-sort-of predict which fish will be in a particular part of a lake at a particular time of the year. Fishing that like warmer water will be surface feeders in the summer and bottom feeders in the fall. And fish that like cooler water will feed deep in the spring and on the surface in the fall. But don't hold us to this. Fish are always tough to catch.

By: jimmy001

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