Emergency treatment Technology of "transferring Water" in Culture Pond

The aquaculture pond "turning water" is a relatively common phenomenon. In the process of aquaculture, sometimes the fish in the pond ate well the day before, but there was a fishy smell in the pond. The next morning, it was found that all the fish in the pond floated and did not go down by noon. Turning on the aerator did not improve, or even did not go down for a few days and nights. At this time, the pond "turning water" should be considered. The following is the emergency treatment technology of "transferring water" in culture ponds.

In recent years, due to the sudden deterioration of this kind of water quality, the phenomenon of flooding pond occurs frequently, resulting in significant economic losses. The following is to introduce the emergency treatment method of "transferring water" in the culture pond. The so-called "turning water" means that the oxygen production capacity and self-purification capacity of the pond are seriously insufficient, resulting in a very low content of dissolved oxygen in the water, a large accumulation of harmful gases and substances, and then the phenomenon of floating head of pond fish for a long time. The performance of aquaculture production: the weather is normal or abrupt, the water changes from oil green to tea brown, sometimes with fishy smell, there are not many fish in the pond, but the floating head does not sink for a few days.

I. the process of "transferring water"

The "turning water" makes the pool water change sharply from the original thick green, blue-green and tea-brown to milky white or dark black, and then gradually become clear and transparent. There is little residual phytoplankton and weak photosynthesis in this kind of water, and a large number of dead phytoplankton have been added on the basis of the original strong organic matter, so the oxidation and decomposition process of organic matter is very strong. The concentration of toxic products (such as molecular ammonia, nitrite, hydrogen sulfide, methane) decomposed by hypoxia will increase sharply. If it is caused by cyanobacteria, it will also produce some special poisons (hydroxyammonia, hydrogen sulfide, etc.).

Second, the reasons for "diverting water"

First, there is an imbalance in the proportion of plankton in fish ponds, and there are too many zooplankton in the water, such as rotifers and cladocera, which devour a large number of phytoplankton, and the reproduction rate of phytoplankton is lower than that of zooplankton, resulting in excessive reproduction of zooplankton in fish ponds. and phytoplankton are swallowed to the end, resulting in extremely low oxygen production capacity of the water body, high ammonia nitrogen and nitrous acid, that is, "turning water". Second, the sudden change of weather and the application of drugs led to the death of a large number of phytoplankton in the water, resulting in a sharp decline of dissolved oxygen and high levels of ammonia nitrogen and nitrite. The two can be distinguished by microscopic examination, the former can be found that there are a large number of rotifers and cladocera in the water, while the latter does not.

Third, the precursor of "turning water"

There are usually signs before "turning water". Usually, the signs of "turning water" are: the water body is too fat, mostly thick green, blue-green, and tea-brown; the water body is black or red; when the aerator is turned on, the water body smells fishy and gives off a lot of foam; pond fish eat slowly and eat less.

IV. Emergency treatment of "diverting water"

The most direct and effective way to deal with the "transferred water" is to change the water, and the bottom water should be pumped out while adding new water; for ponds with limited water sources, chemical drugs and physical methods can be used to adjust the water quality: the first step: turn on the aerator. Step 2: reduce harmful substances. Step 3: fat water. Fertilizer and water is a main measure that must be taken after "transferring water" treatment. After water quality treatment, fertilizer and water such as "Fei Shui Su" or "Fei Shui Pioneer" can be applied. Because the content of total nitrogen in the water is on the high side after "turning water", adjusting the ratio of nitrogen to phosphorus is beneficial to the growth of phytoplankton, and at the same time, it also reduces the concentration of nitrogen in the water, so that the water body can achieve ecological balance and achieve the purpose of fertilizing water.