Fish can not do without water. Good water quality is a necessary condition for the healthy growth of fish. Several water quality indicators that affect fish growth are briefly described below.
1. Water temperature. Water temperature is too high, too low will affect the normal growth of fish, such as herring, grass carp, carp, carp, carp, carp and other fish are most suitable for growth in the water temperature of 23 °C ~ 28 °C water environment, Luo Fei The fish grows fastest in a water environment of 25°C to 35°C. In summer, if the water temperature exceeds the appropriate temperature for fish growth, necessary cooling measures should be taken. When the water temperature is too low in winter, corresponding insulation measures should be taken.
2. Water odor. The water color is reddish or brownish red, and the surface of the water often floats with a layer of oil film. The water body emits nauseating odor, which is extremely harmful to the growth of fish. In the event of such a situation, measures should be taken to remedy the loss of part of the stench water and add appropriate amount of fresh water.
3. Water transparency. Under normal circumstances, the transparency of the pond water body should be maintained at about 20 cm, and the transparency of the water body is too high or too low to be suitable for fish growth.
4. Water dissolved oxygen. The best dissolved oxygen for fish is 5-6 mg/l. When the dissolved oxygen in the water is less than 3 mg/L, it can easily cause fish floating or even pans. Dissolved oxygen in the water body is too high to induce bubbles in the fish
5. Carbon dioxide gas content in water. Carbon dioxide in water bodies is required for photosynthesis of phytoplankton, but its content should generally be below 80 mg/l. If the content is too high, it may cause blood poisoning in fish, and sometimes it may cause deterioration of water quality.
6. The pH of the water body. The pH of the water body should be guaranteed between 6.5 and 8.5. When the water body's pH is below 5.5 or above 10, it cannot be used as fishery water. Sprinkle lime slurry or acetic acid should be used to adjust the pH of the pool water.
7. The content of nutrients in water. The level of nutrients in water is closely related to the healthy growth of fish. For example, nitrates in water are most easily used by green phytoplankton and the content should be guaranteed at 1 to 2 mg/l. If the nitrate content in the water exceeds 3 mg/L, it will easily cause the lack of oxygen in the water and cause the fish to die.
8. Harmful substances in water. Harmful substances (such as phenol, mercury, chromium, lead, and petroleum, etc.) in water bodies can not only cause fish poisoning, but also poison fish. Therefore, water sources contaminated by these harmful substances should not be allowed to flow into fishponds.
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