This is especially true in lakes with deep water such as Lake Berryessa, Indian Valley Reservoir and Oroville. This is why trout fishermen normally troll near the surface for trout during the fall and winter months and deeper during the hot summer months. Trout prefer colder water and will seek these stratas because they are cooler than the temperature on the surface. While these temperatures can vary by as much as 20 degrees depending on the time of the year, they are important to the fish - such as trout. Stratas or layers of water with different temperatures form in lakes during the warm summer months. Water reaches its maximum density and weight at 39 degrees. This is where the term “turnover” comes from. This “heavy water” starts to sink, pushing the warmer water on the bottom to the surface. As the surface water cools it gets heavier. Cold water is denser than warm water and as such is heavier. During the fall months as the daytime temperatures drop, the surface water also starts to cool. During the summer months the surface is warmer than the bottom, thus lighter. Lake turnover is the process of a lake’s water turning over from the top (called epilimnion) to the bottom (called hypolimnion). During the fall and spring months we often hear the phrase “a lake has turned over.” Most fishermen are aware of the term, but many don’t really understand what happens and the effects it has on the fishing. Whereas most people have heard the term of a lake turning over, many people don’t know what actually happens. The fall months are when lakes turn over.
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