decomposition of dead fish and shellfish Revealed by thousands in the Polish River odor There is an additional threat to the second longest waterway in the country, which is believed to be severely contaminated by a spillwarned a scientist on Tuesday.
“The secondary effect of tissue decomposition is the release of hydrogen sulfites and ammonia which are toxic and can dilute in water but also pass into the air,” said Professor Robert Czerniawski, a hydrobiologist at the University of Szczecin (West).
it constitutes youn risk to animals and humansHe pointed out, and warned that, in addition, the decomposition of fish and mollusks may produce substances Food for algae, with the risk that they reproduce rapidly, limits the amount of oxygen in the water.
The first signs of a massive fish death from a spill near Olawa (West) were reported in mid-July, but until last week the incident was underestimated by the Polish government, which has also made a presence in the German part of the river.
On Sunday, the Polish Interior Ministry reported that it had deployed some 2,500 police and firefighters to address the effects of environmental devastation, mainly dead fish and other animals, and the commander of the fire service announced that Since last Friday, 80 tonnes of dead fish have been deposited in the oder. Only on the Polish bank of the river. in German territory 20 tons.
Hydrobiologist Zerniavsky, who is currently conducting field research in the river, pointed out that there are fewer dead fish on the banks than in the past week but it is possible that many remain at the bottom and have not yet emerged to the surface.
“Most of the effects of the disaster are yet to be seen, and will be felt for months and years to come.”“, he predicted, adding to his opinion The waters of the Oder constitute a risk to the Gulf of Szczecin and the Baltic Sea in general.
At present the exact cause of the incident is unknown. An earlier analysis by authorities in Brandenburg, a German region bordering Poland, found traces of mercury, and the media speculated that a factory near Olawa may have been responsible.
However, the Polish government has assured that no trace of mercury has been found, although part of it.E intentionally made an illegal discharge, which was responsible for the death of the creatures, and that it was not a western leak.
For his part, Zerniavsky attributes the situation to a chain reaction caused by a toxic substance and the death and decomposition of a certain number of fish.
“I don’t think a single substance can cause a death so heavy, It is a sequel to the whole process,” he said, although he assured that “without a doubt” it did not start on its own, but was of human origin.