[emergie]

Cyanotoxin hypothesis

Daily cycles on this graph [1] and oxygen surplus can be explained by hyperactivity of organisms that do photosynthesis - cyanobacteries and algae. Something boosted their activity. It might be natural, caused by high temperature very low level of water. Might be because someone contaminated the river with something that worked as fertilizer.

[1] https://nitter.it/pic/orig/enc/bWVkaWEvRmFDNl9EeVgwQUFRNmpRL...

[pvaldes]

Dogs don't eat algae, and there are killed beavers also.

Either you have mercury or you haven't. Blue algae are ephemeral and don't store mercury, If I'm not wrong (I could be wrong)

Wildfires can release mercury, stirring the bottom could (in theory) release mercury and environmental terrorists (from Poland, Germany or other countries) can trow poison in the water, of course. We can see a sudden global pattern of environmental crimes all around Europe since the last months (and don't tell me that is climate change, most wildfires were deliberate and systematic).

A start would be identifying the organisms killed, the level of poisons found in the last years and the type of poison(s) found in their corpses.

[rasz]

> environmental terrorists (from Poland, Germany or other countries) can trow poison in the water, of course. We can see a sudden global pattern of environmental crimes all around Europe since the last months

You seem to be missing one potential candidate state already responsible for some huge environmental disasters this year.

[pvaldes]

We know that at least seven species of fishes were affected. Maybe covering the main trophic chains