High temperature and hypoxia?Frightened?What is the "diving" of the Daming Lake "diving"

On July 12, a video of "the group of fish jumping out of the water after the rainy of the Daming Lake" became a hot spot for the Internet. In the video, the two were rippling in a small boat, and a large amount of fish surrounded by scrambled out of the water, tumbling, jumping, and even some unfortunately fell into the ship.

Faced with this "wonders", netizens speculated that Yunyun: High -temperature rainstorm causes the fish to be hypoxic? Water "hot feet"? Is the ship leakage? Is it scared?

According to the online video, the photographer said that at that time, he was playing on the shore, and the fish suddenly jumped. "It should be that the fish is hypoxic, and the boat passes through. I have never seen so many fish. " The reporter tried to contact the inquiry more about details.

Relevant personnel in the first spring area of ​​the world said that they also paid attention to the video, "in Daming Lake, this phenomenon is not uncommon." The reporter search found that on July 7th and August last year, some netizens shot videos in different areas of Daming Lake.

In addition, similar phenomena have appeared in Xuanwu Lake in Nanjing, West Lake in Hangzhou, Erhai Lake in Dali, Nanhu Park in Changchun, and Mingyue Lake in Texas. In June 2017, a certain park in Jiaozuo, Henan also appeared, and the relevant local departments explained: "The sound of the singing competition in the park was too loud, and the fish were frightened."

Jiaozuo group fish collective "suicide"

Why did the fish in the Daming Lake jump out of the water collectively? Related persons speculated that "may be related to the reduction of the water level of Daming Lake". She revealed that due to the heavy rainy weather, the Huocheng River in Jinan has recently rejected the floods. It has been reduced to 23.82 meters, "but just guessing, it is unclear for specific reasons."

In this regard, the reporter consulted the relevant technical personnel of the Aquatic Department of the Jinan Agricultural Technology Promotion Center. The technician first denied the view of the lack of oxygen in the fish group. He explained that if the fish is hypoxic, it will first "float the head" and breathe on the water, and the state will be sluggish instead of jumping.

After watching the video, he analyzed that most of the fish jumping out of the water was catfish. The catfish is irritable, and the external environment changes or disturbed or stimulates the water surface. In his opinion, this time the fish jumping out of the water may be disturbed by machine boats. "From the video point of view, the waters of the fish jumping are relatively narrow, and when the space is too large, Scared phenomena will occur collectively. "He also said that generally windy or heavy rainy weather does not cause this violent phenomenon, and this phenomenon rarely occurs in other fish species.

Is the collective jump that causes damage to the fish itself? The above -mentioned technicians said: "Occasionally, occasionally, the impact is not great. Let the fish be disturbed. "To control the density reasonably, do not have too much fish. If you do more, you can fish some. At the same time, the water quality is monitored regularly to prevent a large number of dead fish due to worsening water quality." (Jinan Times · New Yellow River reporter Shi Xiaodan)

Edit: Zhang Yu

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