A climate suitable for fishing at night

The survival temperature of carp, crucian carp and grass carp is 0 ~ 40℃, and the suitable temperature is 25 ~ 28℃. In this suitable temperature range, the digestive enzymes in fish are the most, and the activity of digestive enzymes is strong. Therefore, fish has the largest food intake, strong digestibility, high digestibility and the highest metabolic level. With the decrease of temperature, the number and activity of digestive enzymes in fish decreased rapidly. Therefore, the digestibility of fish drops rapidly, and the digestion speed of food slows down obviously. As a result, the food intake dropped sharply! This is the real reason why you can't catch fish when the weather suddenly cools down or someone puts groundwater into the fish pond. The higher the water temperature, the more vigorous the physiological activity of fish, the more oxygen it needs and the higher the oxygen consumption rate. The physiological activities of fish are enhanced, but the metabolic level is decreased, which consumes more nutrients and absorbs much less nutrients. Coupled with lack of oxygen, food intake will also decrease. So it is difficult to catch good fish in hot weather.