A final report released by German experts on Friday regarding the mass fish deaths in the Oder River this summer leaves the question of the exact cause of the disaster unanswered. A group of experts led by the Environment Agency presented the results of their analysis on Friday, confirming the presence of toxic algae as the most likely cause of the environmental disaster. However, it remains unclear what led to the unusually high salt concentration in the water that favoured the proliferation of the toxic algae “due to a lack of available information,” the report said. There was also no clear …