When the fish drowned in the sea

  No animal is better at swimming than fish, and the sea is even more home to fish. It’s hard to imagine that fish will be drowned in the ocean, but right now, this is actually happening—some water masses called “fish nightmares” wander like ghosts in the sea, and fish in the ocean Just touch it and die…
  Recently, a well-known water mass comes from Hurricane Harvey, which has ravaged the American continent since August 2017 and brought 100 billion tons of precipitation. Then, the rainwater poured into the sea. You may think that it is normal for rainwater to return to the sea. Every day, countless rainwater flows into the sea through the river. However, things are not that simple.
  Fresh water flows into the ocean, but the water in the ocean is salt water. The river will form a “buffer” area near the mouth of the sea, where fresh water and sea water mix with each other, the fresh water becomes salty, and the salt water becomes weaker. The farther away from the estuary, the closer the salinity of the water will be to the sea, until it is thoroughly mixed with the sea. This “buffer” area is home to some unique biological groups. Many of these animals can adapt to both fresh water and salt water. They have special regulation mechanisms in their bodies that allow them to survive in such an environment.
  For pure marine fish, fresh water is quite dangerous.
  You can think of water molecules as very tiny particles. In fact, even in the molecule, they are considered tiny. Cell membranes cannot block the entry and exit of these tiny particles, and water molecules also have the ability to penetrate. They will penetrate from places with low concentrations to places with high concentrations.
  Therefore, when marine fish encounter fresh water, the situation is very dangerous. The concentration of fluid in fish cells is comparable to that of seawater, but higher than that of freshwater. Fresh water will flood into the fish cells quickly, bursting the internal structure of the cells, even the cells themselves, and the fish will die quickly.
  I have seen such a thing with my own eyes. One year, I brought back a small fish from Bohai Bay, prepared artificial sea water, and then kept it in a fish tank and placed it on the desk. Due to natural evaporation, the water began to become salty, so I made a mark on the surface of the fish tank. Whenever the water surface dropped a little, I added a little pure water to maintain the salinity of the water. This little fish has been kept for a long time, until one day, I took care of it and took a bottle of pure water to add water to it, because I wanted to quickly replenish the water, so the water flow was a bit big, so big that I could see it clearly Of fresh water column. The little fish actually swam to the water column in a ghostly manner, the effect was immediate, and the whole fish began to spasm and twitch. I stopped immediately, but the fish died after lingering for a while.
  You can imagine the consequence of the huge precipitation brought by the hurricane: it will rapidly expand the area of ​​the original entrance to the sea, and even extend to the depths of the ocean. Because it takes time to mix the salt, such a large mass of fresh water will last a long time. Before it was completely integrated into the ocean, it floated like this, blocking ocean currents and destroying marine life, whether it is fish, coral or shellfish…
  Fortunately, this time it was more fortunate. Its path deviated from southeast Texas. The coral reefs have existed for tens of thousands of years in the marine reserve of the Ministry of Foreign Affairs. Once it collides with the freshwater mass, the consequences will be disastrous. And such a thing may happen again after a certain amount of precipitation in the future, and it may not be in the Americas, so we should be vigilant and make early plans.