What is the relationship between the culture of the four major domestic fish and meteorological conditions

Fish live in water, but it is also closely related to meteorological conditions.

Temperature fish is a variable temperature animal, the water temperature is the body temperature, the water temperature directly affects the metabolic activities of life, the optimum temperature ranges from 10 to 33 degrees Celsius, the optimum temperature is 25 to 30 degrees Celsius, the optimum temperature begins to dormancy below 10 degrees Celsius, and begins to feed at 10 to 15 degrees Celsius. Slow growth, increased appetite at 15 to 20 degrees Celsius, grows faster, grows fastest at 20 to 30 degrees Celsius, and slows down above 30 degrees Celsius. Therefore, the amount of bait should pay attention to the change of temperature, which is also related to the amount of dissolved oxygen in water.

Temperature is closely related to spawning, spawning, egg hatching, fry growth, transportation and so on. Water temperature 18 to 30 degrees Celsius, continuous sunny days to induce spawning, egg production, fertilization rate, hatching rate are high, domestic fish below 8 degrees Celsius stop eating, poor appetite above 30 degrees Celsius, low hatching rate below 16 degrees Celsius, high mortality rate above 31 degrees Celsius, less movement and less oxygen consumption of fish from 8 to 10 degrees Celsius, suitable for transportation. When the temperature changes suddenly, the fish is easy to die, especially when the fry is released, we should pay attention to the difference in water temperature.

Light fish, like other animals, need an adequate supply of oxygen. An important source of oxygen in the water is the oxygen released by photosynthesis of phytoplankton in the water. Other organisms and bacteria in the water also consume oxygen when they break down organic matter. Therefore, severe shading, or long-term overcast and rain, poor light will affect the content of oxygen in the water and affect the growth of fish. Without light, the production of plants in the water is affected, and the food supply of fish is also a problem.

The oxygen in the air can also be directly dissolved into the water, but the amount is small. When there are winds and waves, the oxygen dissolved in the water is more than 100 times faster than that in still water. When the temperature is high, the amount of dissolved oxygen decreases, and the decomposition is strong, which increases the consumption of oxygen, so it is more likely to lack oxygen at high temperature, resulting in floating head. When the air pressure is low, the oxygen dissolved into the water is also reduced, and the cloudy days with low pressure and high temperature are most prone to hypoxia, which is worth noting.