CATDOLL : CATDOLL: What is the reason why silver carp always die of weight loss in mixed fish ponds?

What is the reason why silver carp in mixed fish ponds always become thin and die?

Because the silver carp can't eat the bait you throw, or they don't like it, plus the water quality may be poor. If it is green water, they can also eat green algae. Maybe your pond is clear water, so they are likely to starve to death.

What causes the mass death of fish in fish ponds?

A large number of fish died in the fish pond, and it is suspected that the pig farm discharged wastewater.

According to reports, on April 19, 2018, Ms. Zhang from Mingdu Town, Chang'an District, Xi'an, Shaanxi Province, called the news hotline of the China Business News and said that at least 20,000 fish in her fish pond had died in the past month, with a loss of tens of thousands of yuan. She suspected that the cause was the neighboring pig farm.

On the morning of the 18th, at the fish pond of Lao Li's Ecological Fishing Park in Mingdu Town, Chang'an District, Ms. Zhang pointed to the densely floating dead fish on the surface of the pond and said, "I have been operating for more than 20 years, and this is the first time I have encountered this situation." According to Ms. Zhang, a large number of fish died in two fish ponds with a total area of ​​about 18 mu. "Silver carp and bighead carp died the most, and the dead fish were at least 6 or 7 kilograms. There were also small crucian carp, carp and other fish." Ms. Zhang said. "Since the beginning of March, two buckets of dead fish have been fished out every day. Later, the number of dead fish became more and more serious. Especially after the rain a few days ago, you can see large and small dead fish floating on the surface of the pond every day." Ms. Zhang said that there are two pig farms just south of the fish pond.

"Not only does it smell sour all year round, but it also discharges wastewater into the wasteland adjacent to the fish pond and the pig farm, which slowly seeps into the fish pond, changing the water environment in the fish pond and causing a large number of fish deaths," said Ms. Zhang. In a pig farm no more than 10 meters away from the south end of the fish pond, Ms. Zhang pointed to a pond more than 50 meters west of the Han River. This pig farm has been secretly discharging wastewater into the Han River for many years. Is this a problem?

The staff of the pig farm said that Ms. Zhang had previously complained to the environmental protection department, and now a cement platform about 7 meters long and 50 centimeters high has been built on the adjacent land of the two houses. "We will move out in the near future. We have been operating here for more than 7 years, and we built a septic tank last year. Ms. Zhang did not produce any evidence that the fish deaths were related to the pig farm's wastewater. The fish deaths may also be related to its aeration pump, but I don't know." The staff said. But Ms. Zhang pointed to several pieces of land on the adjacent wasteland of the two houses that had turned black, green and smelled bad and said, "The terrain here is high in the south and low in the north. Can a cement platform only 6 or 7 meters long block the discharge of wastewater? Before we move out, will our fish ponds continue to be polluted and continue to suffer losses?"

Ms. Zhang took the reporter to another pig farm, which was no more than 30 meters away from the south end of the fish pond. A staff member said that the pigs in the pig pen near the fish pond had been sold at the beginning of the year, and they had been using septic tanks and dry manure tables in accordance with relevant regulations, and would not discharge manure randomly. The responses of the two pig farms made Ms. Zhang very dissatisfied. "The environmental protection department came to conduct a sampling survey a month ago, but has not released relevant data. The fish in my fish pond are still dying. Who will bear this loss?" The reporter has called the 12345 citizen hotline to report the problem again. The hotline staff said that they will respond as soon as possible.

Source: Huashang Daily