Die off of fish in a lake in Sovicille, Italy
Fish kill in Lake Rancia, Arpat: “The analysis does not give an indication of the presence of chemical alterations. The hypothesis is the collapse of the system ‘
There are the results of laboratory tests performed on the sample of water taken from the technical Arpat in Lake Rancia ( read the news ), in the Sovicille, after there had been a die-off of fish. The data, however, do not give further indications about the presence of chemical changes that might have given rise to the event.
“The comparison of the value of conductivity – is to know the Arpat – the content of sulfates, bicarbonates and sulfides does exclude a massive presence of thermal waters with characteristics similar to those of the surrounding area, speculated upon by some memory. Also research the set of potentially toxic metals for the fish life was negative with values below the detection limits. “
“As reported in our previous news – continues the Arpat – the measurements made in the field have established a presence of oxygen in the water is not compatible with the fish life, but that could be correlated to the processes of degradation due to the memory of the animals already in act and not necessarily be the cause. Therefore, in light of the analysis carried out by ASL on dead animals, which do not show certain causes for the event happened, the most likely hypothesis may be that of a collapse of the system. “
“In summary – concludes Arpat – the most probable hypothesis is that the pond, consisting of a closed system that has no exchange with water courses both in input and in emission, due to the previous location inside of fish , also consist of non-native species, in order to promote sports fishing which was then made to cease, came to be in a situation of imbalance environmental, probably favored also by external climatic factors, has led to the memory, at first of small fish, which gave rise to the first aerobic fermentation processes that were due to the subsequent degradation of the habitat to make life unbearable for animals of larger size.”