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Is the crayfish that can go uphill the power given by ammonia nitrogen?

by:BOQU     2023-03-16
The main sources of ammonia nitrogen in shrimp ponds are: first, the deposition of excess feed in the water, and second, the production of fish and shrimp excrement and the metabolism of aquatic animals and plants. Ammonia nitrogen in water exists mainly as ammonia molecules and ammonium ions. Ammonia nitrogen in water exists as molecular ammonia and ionic ammonia. Molecular ammonia is very toxic to crayfish, while ionic ammonia is not only non-toxic, but also one of the sources of nutrition for aquatic plants. When the concentration of molecular ammonia in the water body is too high, it will cause toxemia in crayfish. If it is too high for a long time, it will inhibit the growth and reproduction of shrimp, and severe poisoning may even cause death. Molecular ammonia sources: The main sources of molecular ammonia in aquaculture are the feed that sinks to the bottom of the pond, the remains of shrimp and crab row, fertilizer and the remains of dead animals and plants. Nitrite is an intermediate product of the decomposition of organic matter in aquaculture water, so it is extremely unstable. When the oxygen is sufficient, it will be transformed into less toxic nitrate under the action of microorganisms. When the oxygen condition is not good, it will be transformed into toxic water. Nitrate is the decomposition product of nitrogen-containing organic matter in the final stage of mineralization. Nitrate can be reduced to nitrite under anoxic and acidic conditions. Nitrite nitrogen is an intermediate product of the nitrogen cycle and is unstable. Depending on the water environment conditions, it can be oxidized to nitrate nitrogen or reduced to nitrogen. When the concentration of nitrite in the water body is too high, it enters the blood of crayfish through osmosis and absorption, thereby causing the blood to lose its oxygen-carrying capacity. High nitrite content in the water body will cause short-term physiological hypoxia and even death of crayfish. Therefore, how to quickly reduce nitrite in a short period of time is the primary issue. Ammonia nitrogen poisoning is mainly manifested in the low immunity of shrimp caused by ammonia nitrogen in the body. The ammonia nitrogen in the water body causes lobsters to climb ashore or refuse to enter the water on grass. The limbs are weak and the shell is not hard, accompanied by symptoms of failure to molt. Caterpillars and other parasites, gills, liver and heartbeat are normal, but food intake is significantly reduced or no food is eaten for several consecutive days. Therefore, the landing of crayfish is basically caused by dark poisoning. So how to prevent excessive ammonia nitrogen in crayfish ponds? The method is as follows: 1. Dry pond and dredging. After the end of a breeding cycle, timely dry ponds, dredging and drying ponds, etc., and thoroughly disinfect and sterilize them with quicklime or bleaching powder to reduce nitrogen-containing organic matter, reduce oxygen consumption in bottom mud, reduce insect eggs, and avoid large-scale reproduction of insects . 2. Promote nitrogen with phosphorus. The ratio of nitrogen and phosphorus in water is seriously out of balance, which can cause a large amount of nitrogen to be unable to be used by phytoplankton and form nitrogen-enriched. A formula fertilizer with high phosphorus and low nitrogen can be used appropriately. 3. Reasonable stocking density and scientific and reasonable feeding. A reasonable stocking density can ensure that the dissolved oxygen in the water body can meet the needs of the growth and reproduction of farmed animals, and the decomposition ability of excreta can reach a balance. Feed is one of the main sources of ammonia nitrogen in the water body. It can improve the quality of feed, reduce the generation of residual bait, and reduce the growth and reproduction of harmful bacteria. 4. Use the aerator reasonably. Turn on the aerator at noon on a sunny day to mix the upper and lower water bodies, break the stratification of the water body, increase dissolved oxygen at the bottom of the pond, and reduce the oxygen debt at the bottom of the pond. 5. Scientific and reasonable fertilization to cultivate algae, and reasonable planting of aquatic plants. Algae and aquatic plants have a strong ability to purify ammonia nitrogen, but it is necessary to reduce the use of chemical fertilizers such as urea and ammonium bicarbonate to strengthen water and grass; excessive use of these nitrogen fertilizers will lead to increased water quality indicators such as ammonia nitrogen and nitrite. It is recommended to use low-temperature fertilizers for aquatic products, such as amino acid fertilizers, high-phosphorus and low-nitrogen fertilizers, etc., and keep the principle of small amounts and multiple times. The density of aquatic plants should be reasonable. If the aquatic plants are too thick, respiration consumes a lot of oxygen at night. It is recommended that the volume of aquatic plants account for 50-60% of the entire pond water body. 6. Change the bottom. Regularly use potassium hydrogen persulfate to improve the bottom, decompose the organic matter in the pond, kill harmful bacteria and insect eggs at the bottom of the pond, reduce oxygen consumption, and increase the overall dissolved oxygen in the pond. 7. Add Youlanbao. Adding Youlanbao to the feed can effectively improve the utilization rate of protein and reduce the discharge of ammonia nitrogen from the source. It can enhance the body's immunity, improve the survival rate, reduce ammonia nitrogen and nitrite, inhibit harmful bacteria, and promote the growth of crayfish. 8. Change the water appropriately. If the water source conditions are suitable, the ammonia nitrogen in the water body can be diluted by changing the water appropriately.
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