Technical measures to avoid deterioration of water quality in fish ponds
December 13 04:03:22, 2018
Once the water quality of Fish ponds deteriorates, fish will be deprived of oxygen, poison and even die. Therefore, it is very important to do a good job in water quality management. 1, timely dredging. The siltation thickness of intensive fish ponds generally increases at a rate of about 10 cm per year. Keeping a suitable thickness (15-20 cm) of silt in the pond can play a role in maintaining fertilizer, supplying fertilizer, and buffering water quality. However, if the silt is too thick, it will cause harm to aquaculture and must be improved by dredging. When the pond is dredging, the pool water is drained first, and artificial or mechanical (mud pump) dredging or dredging with water by means of a submerged underwater dredge is carried out. It is also possible to grow some emergent or submerged plants in the pond. Substrate. 2. Apply bleaching powder. In order to kill pathogens, parasites, etc. in ponds, some farms or farmers use large amounts of lime and bleach. Do you not know that while killing germs and parasites, algae in the water body are also killed, resulting in lean water. The residual bait of the feed and the ammonia nitrogen, nitrous oxide, and carbon dioxide gases produced by the decomposition of the fish manure lose the phytoplankton that use them as a nutrient source. These harmful gases are accumulated in large amounts in the water and cause fish poisoning. Therefore, disinfectant ponds should be properly applied bleaching powder. 3, with warm feeding. Feeding adult diets in the spring should be done with interval feeding. Usually feed 2-3 times a day. From the rain to the summer, the food intake of fish gradually increases, and the feed is changed from feeding to feeding every day. It is best to feed on a fixed food table so as not to waste feed and pollute the water. The most suitable water body for pond fish farming is generally 25-30 cm in transparency. If the transparency is too small, the amount of fertilizer should be reduced or the fertilizer should be stopped immediately. If the transparency is too large, apply more fertilizer to improve the water quality. Generally, fertilizer is applied once every 5-7 days, and 50-80 kg of compost organic fertilizer or 2-4 kg of fertilizer is applied every 0.067 ha. 4, regular measurement of water. Fishes are suitable for growing in neutral or slightly alkaline water bodies. The stock of organic matter in the fish ponds is large and the water quality is often acidic. Therefore, it is necessary to regularly take water samples from fish ponds to measure pH, dissolved oxygen, and ammonia nitrogen at least once every two weeks. If there are 72 grams of ammonium ions per cubic meter of water, one-third of the pond water must be replaced. It is better to replace the pond water containing abundant phytoplankton to improve the water quality and increase the dissolved oxygen in the water. If necessary, use oxygen aerators for 1-2 hours per day. Perennial fish farming, ponds with an average depth of 1 meter per 0.067 hectares are sprinkled with 20-25 kg of quicklime per day, once every half a month, so that the fish are in the best growing water environment. It must be noted that pH above 8.5 is not conducive to fish growth, and when the pH is above 10 or below 4.5, fish will be killed. 5. Beware of accidents. Once a dead fish is found to be deteriorating due to water quality, 1/3 or more of clean water is injected immediately to reduce the concentration of ammonia nitrogen and nitrite nitrogen in the water. Each cubic meter of water is splashed with 25 grams of salt to reduce the amount of nitrous acid in the water. Repeat the operation until the ammonia nitrogen is adjusted to the normal range.
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