What is the autumn turnover?
To put it simply, autumn turnover refers to the process of mixing and inversion of the water in the upper and lower layers of the water body within two to three days in autumn.
In summer, the high temperature brought by the sun increases the water temperature on the water surface, while the water temperature in the lower layer, especially in the deep water, can be much lower. In autumn, the drop in air temperature causes the water temperature on the water surface to decrease, and the density of the upper layer of the water body also increases. This density change causes the upper layer of water to sink, while the lower layer of less dense water begins to rise, causing the water body to turn over.
Influence of the autumn turnover on fish
The turnover of the water body changes the environmental conditions in which the fish survive, and they also need a new adaptation process. The fish will open less when they feel uncomfortable. Maybe you need to deal with a slower take-up speed and smaller lure.
The time point when the water body turns over
The first is the latitude of the fishing waters. For water bodies at high latitudes, because the temperature begins to drop earlier, the time for the water body to turn over is earlier. The second is the area and depth of the water body. The larger the body of water, the deeper the body of water, and the longer it will take to complete the flip.
How to tell if a body of water is turning over？
The most direct way is definitely to use a thermometer to measure the water temperature at different depths. If the temperature difference is still large, it has not been turned over yet, and if there is almost no temperature difference, it has already been turned over.
Second, you can look for the thermocline on the fish finder. On the 2D image, there is clearly a line above the bottom of the water, and the water body below this line is denser, which means that the water body has not turned over and the thermocline is still there. Conversely, if the line is no longer visible, the flip is complete.
Also, you can tell by visual inspection of the turbidity of the water, which must suddenly become turbid once the flip is happening.
Conclusion
It is not easy to catch fish during the autumn turnover period, but this is a normal phenomenon in nature. But this process brings more oxygen to the water, giving the fish a better living environment.
Post time: Sep-23-2022