March 25. Atlantic Coast, Florida. Many dead fish rose to the surface of the lake in the park Hannah. Floating fish smelt of rotting and had a repulsive appearance.
"I saw a few people, and ride around on bicycles, but as soon as they were near the place at once turned back," — said the park visitor Heather Lenier. Sight and smell of it was enough to keep people at a distance.
Scientists argue that the cause of death can be breeding golden algae, which produces toxic chemicals to fish. When the fish come in contact with contaminated water, their blood cells literally explode.
"Those cells that carry oxygen, broken," — says biologist Dana Morton. — "Oxygen does not enter the body, and the fish seems to choke, which in reality is." Morton said that as far as golden alga is fatal to fish, so it is harmless to humans. Scholars have noted that for 14 years of observing the lake water, it has never been found golden algae.
In fact, their presence is more common in lakes and ponds of Texas than Florida. Toxic algae present for years in very small quantities.
"All species have different conditions for its prosperity," — said Morton.
Some golden algae (b. Uroglena, Dinobryon, Mallomonas, Synura; Prymnesium parvum), developing in large quantities, can cause algal blooms. They secrete aldehydes and ketones, which can give water an unpleasant odor and taste, and Uroglena volvox — toxic to fish fatty acids.