“Transferring water†in aquaculture ponds is a relatively common phenomenon. During the breeding process, fish ponds sometimes appear to be eating well on the day before, except that the fish ponds have a stench of stench, and the next morning the pool fish are all found floating. Until noon, the aerator did not turn for the better. Even if it did not go on for several days and nights, it was necessary to consider the pond "turning water". In recent years, due to the sudden deterioration of this water quality, pan-tang phenomenon has occurred frequently, resulting in major economic losses. Here we will introduce the emergency treatment method of “turning water†in aquaculture ponds.
The so-called "turning water" means that the pond's water body's oxygen production capacity and water body's self-purification capability are seriously insufficient, resulting in extremely low dissolved oxygen content in the water, accumulation of harmful gases and substances, and the phenomenon of floating fish heads for a long time. The performance of aquaculture production: The weather is normal or abrupt. The water changes from oil green to dark brown, sometimes with a stench of stench, and there are not many ponds, but there is a phenomenon that the floating head does not sink for several days.
The process and reason of changing water
The process of "turning water"
"Turning water" makes the pool water from the original dark green, blue-green, dark brown into a milky or dark black, and later gradually become clear and transparent. This kind of water has very few phytoplankton residues, and its photosynthesis is weak. Moreover, on the basis that the original organic matter is already very strong, a large amount of phytoplankton is still dead. Therefore, the oxidative decomposition of organic matter is very strong. The concentration of toxic products (such as molecular ammonia, nitrites, hydrogen sulfide, and methane) that degrade organic oxygen due to anaerobic conditions rises sharply. If it is caused by cyanobacteria, it will also produce some special poisons (hydroxylamine, hydrogen sulfide, etc.).
Reasons for changing water
One is that the proportion of plankton in fish ponds is imbalanced, and there are too many zooplankton in water bodies, such as rotifers and cladocerans, which ingest large amounts of phytoplankton. The reproduction speed of phytoplankton is lower than the speed of swallowing by zooplankton, resulting in fish ponds. Zooplankton is overproduced, and phytoplankton are swallowed up. Therefore, the oxygen production capacity of the water body is extremely low, and the ammonia nitrogen and nitrous acid are too high, that is, “turning waterâ€. Second, sudden changes in the weather and the use of drugs caused a large number of deaths of phytoplankton in the water, leading to a drastic decline in dissolved oxygen in the water, and high levels of ammonia nitrogen and nitrite.
The two can be distinguished by microscopic examination. The former can find that there are a large number of rotifers and horny species in the water, while the latter does not.
The precursor to "turning water"
There are signs before the occurrence of "turning water". Usually the symptoms of "turning water" are:
1 The water body is too fat, mostly dark green, blue-green and dark brown;
2 The body of water is black or red;
3 When the aerator is started, the body of water will have rancid odor and a large amount of foam will be emitted.
4 pond fish eat slowly, reduced food intake.
Emergency treatment of "turning water"
1) The most direct and effective way to deal with "turning water" is to change the water, and add fresh water while pumping out the bottom water.
2) For ponds with limited water sources, chemical drugs and physical methods can be used to regulate water quality.
The first step: open aerator.
The second step: reduce harmful substances.
The third step: fertilizer and water.
Fertilizer is a major measure that must be taken after the “turning water†treatment. After the water is treated, fertilizer and water such as "fat fertilizer" or "figure of water and fertilizer" can be applied. Because the content of total nitrogen in the water after the "returning water" is high, adjusting the ratio of nitrogen and phosphorus in the water is conducive to the growth of phytoplankton, and also reduces the concentration of nitrogen in the water, so that the water achieves ecological balance and reaches the purpose of fertilizer and water.
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