In winter fishing, water temperature becomes the main factor affecting the opening of the fish. The so-called finding a fishing spot and choosing a fishing spot is essentially to find the best water temperature suitable for fish activities.
The characteristics of water and air are different, which leads to different changes in water temperature and air, and we need to grasp the characteristics of water temperature changes when fishing.
Here are 5 things to share about water temperature, which is very simple and many anglers know, but it is recommended that anglers take a look, which is very helpful for winter fishing.
Water is a poor conductor of heat, and its specific heat capacity far exceeds that of air. As a result, heat is transferred very slowly in the water, and at the same time, water needs more heat than air to raise by 1 degree, and the heat released by lowering it by 1 degree is also much higher than that of air.
When the air temperature rises or falls, the water temperature does not rise or fall immediately, but has a certain delay, and the rise and fall will be smaller than the air, and the deeper the water, the more obvious this feature is.
This is the reason why the water temperature is higher than the air in winter and the water temperature is lower than the air in summer, which is also the basis for being able to fish in winter.
When the temperature drops, even if it drops below 0 degrees Celsius, the temperature in deep water is still relatively high, and cold-tolerant fish such as crucian carp will still open their mouths.
That's why it's still possible to fish on the day of the cold spell and when it snows. Although the temperature has cooled, the drop in water temperature will be delayed, and the fish in the water are still willing to open their mouths before being affected by the cooling.
Thermal expansion and contraction is a common sense that everyone knows, the temperature decreases and the material will shrink, and the density will increase, therefore, if the air conditioner is turned on in summer, the fastest refrigeration method is to blow cold air upward, and the density of cold air will sink, and the indoor air will form convection, and the temperature will drop rapidlyIn winter, when the air conditioner is turned on, it is just the opposite, blowing hot air downward, the temperature of the air below will rise if the density is high, and the indoor temperature of the air convection will rise rapidly.
But this property is not very suitable for water, which has an interesting tipping point: 4 degrees Celsius.
When the water temperature drops below 4 degrees, it will become a thermal contraction and cold contraction.
When the water temperature exceeds 4 degrees, there will be convection in the upper and lower waters, and even if the water temperature in the lower layers is high, it will drop down with the convection over time.
However, when the water temperature drops below 4 degrees, the higher the water temperature, the more it will drop, which will cause the upper water temperature to drop to one or two degrees or even below 0 degrees, while the lower water is still around 4 degrees, and the fish will still open their mouths at the bottom.
This is also the reason why in the Northeast, the temperature drops to minus twenty or thirty degrees, and a thick layer of ice has formed on the river, and you can still fish by digging an ice cave. Although the upper water has frozen, the temperature in the deep water is still around 4 degrees Celsius, and the crucian carp will of course open its mouth.
This feature is inseparable from the above article. It is precisely because of the phenomenon of heat contraction and cold expansion after the water temperature drops below 4 degrees Celsius that there is no convection of the upper and lower water, and the heat of the lower water is very small, and it can be kept at about 4 degrees for a long time.
The temperature of the deep water has stabilized, and even if the temperature of the air and upper water changes drastically, the fish hiding in the deep water are almost unaffected and will still actively open their mouths. That's why, in winter, we want to fish in deep water.
On a sunny day, what time do you think the temperature is the highest and when is the lowest?Is it 12 o'clock and 0 o'clock?
No, although the temperature is quite high at 12 noon, the highest time of the day is 2 pm.
This is because it takes time for heat to accumulate, and although the sun shines most violently at 12 o'clock, the heat is still accumulating and the temperature is rising all the time. At 2 p.m., the heat from the sun begins to fall below the heat lost, and the temperature does not rise, at which point it is the highest temperature of the day.
The same is true at night, when around 2 a.m. is the lowest temperature of the day.
As mentioned above, the temperature of water is delayed from the temperature of air, so the highest time of the day is about 4 p.m. and the lowest time of the day is about 4 a.m.
We went fishing in the nest at noon, and the fish did not open their mouths until the afternoon, because the water temperature was relatively high at about 4 p.m., and the fish swam from deep water to shallow water to feed.
According to the above, the water temperature is highest at 4 p.m., so is it the easiest time for fish to open their mouths?This is not the case.
Although the afternoon temperature is high, the water temperature is stratified, with the upper water much higher than the lower water. The fish swim from the bottom to the shallow water, and the sudden increase in temperature causes the fish to react with stress and be reluctant to speak. This is the reason why when you see a fish floating head at noon in winter, you know that the fish is not easy to catch.
Winter mornings are the time when the fish are willing to speak. Although the water temperature is low in the morning, the temperature difference between the upper and lower layers of water is small, and the temperature of the lower water is relatively stable, and the fish will actively open their mouths at the bottom of the water.
So, winter fishing, you can choose in the morning;If it's cloudy or snowy, you can fish all dayIf it's sunny, it's best to avoid the noon period and fish after 4pm.
The above 5 knowledge about water temperature has a certain guiding role for us fishing, but it is not absolute, and fishing friends only use it for reference.