The influence of atmospheric pressure when fishing for bream
The oxygen content in water depends on atmospheric pressure. The higher it is, the more dissolved oxygen in the water. Conversely, when a low atmospheric pressure, the oxygen content of the water decreases.
Therefore, clear, Sunny weather, with a light South wind that promotes mixing of water, optimal for catching bream. Windless cloudy weather, accompanied by a decline in atmospheric pressure and the deterioration of the oxygen regime affects the biting bream negatively.
These rules apply not only on bream but also for pike, roach, white bream, that is those fish that are very sensitive to the deterioration of the oxygen regime of the reservoir.
But, let me emphasize that these weather conditions affect the feeding activity of fish only in slow deep lakes.
Few the situation is different for large but shallow oblong lakes. In such reservoirs the phenomenon of stratification is absent. Due to the wind a small layer of water is well mixed. Feeding areas can be located throughout the waters.
But here on the behavior of bream, mostly affected by water temperature. If it exceeds 24…25 C, the biting, as a rule, is weak.
In such a situation I found myself in July last year, when caught on White lake, which is located on the Karelian isthmus. Despite the impressive dimensions (length of the lake is about two km, width 250 m), shallow lake. Almost everywhere, the depth does not exceed 2 — 2.5 m. Near the banks overgrown with mixed forest, sandy bottom, with a mixture of pebbles, then comes the mud.
The main reservoirs of fish: pike, perch, roach, ruff, small bream (up to 400 m).
The main feeding areas of the colony small molluscs, bloodworms, crustaceans were placed at a considerable distance from the coast — banks, where the depths ranged from force 1 n. It is here that concentrated the bream, pike, perch, roach.
July was very hot. Often, even at night, the air temperature was above 22 — 23, and the temperature of the water was enormous for such a breadth of level 25! In the afternoon, and even early in the morning, nibble completely absent. The bream were taken only at night — from about 23 to 24 hours. Then came a short break, and the bite resumed about two hours lasted only an hour. A characteristic feature of the lake was that the bream here do not come to shore. Despite this great forage base and fish in the lake are small. The main reason for this periodic — Zamora, the scourge of almost all shallow oblong lakes.
Daily migration of bream. Consider the daily migration of bream depending on the location of the feeding areas, which is very important for proper choice of fishing.
Take for example a typical deep poorly-flowing lake. In summer the stratification boundary located at a depth of about 3,5 — 4 m. From biology it is known that the most intensive development of aquatic life occurs at the border of warm and cold water.
Roughly the same phenomenon is observed in the World ocean: the maximum concentration of plankton, and hence fish, located on the border of cold and warm currents (the so-called threshold surge of life»).
The bigger the bream, the less of its diet of aquatic plants. The primary forage base consists of small clams, bloodworms, crustaceans, animal food, and it is concentrated at depths of 3.5 — 4 m.
If the boundary of the stratification descends deeper, her moves and bream.
Under what conditions large specimens will go on smaller sites? There is one of the factors that can «push» the fish to the shore, a sharp deterioration of the oxygen regime, but this phenomenon in weakly flowing lakes often. The diet of bream aquatic plants account for a much greater percentage. Therefore, the bream almost regularly comes to feed in the shallows, especially in early morning and evening hours.
In addition to plants in its diet also includes: bloodworms, small crustaceans, Cyclops, caviar, snails, etc.
In the afternoon, the bream leaves in the surrounding depths, provided that it maintains a favorable oxygen regime.
Thus, speaking about the behavior of bream in small and medium sized oblong lakes, we can draw the following conclusions:
bream under favorable conditions is concentrated in the bottom plots, on the border of stratification;
• the deterioration of the oxygen regime of the reservoir or he stops eating, or coming to the shore, regardless of the time of day;
• the main feeding grounds are on the border of stratification;
• bream is a large «vegetarian» and regularly feeds in shallow water;
• weakly flowing lakes bream rarely reaches a large size (over 1 kg) due to constant violations of the oxygen regime.
• in slow shallow lakes in the summer stratification is absent, but regular winter kills and inhibit the growth of bream and the development of the population as a whole.