Ernakulam (Kerala) [India], a report by the Kerala University of Fisheries and Ocean Studies (KUFOS) said that the massive fish die-off in a tributary of the Periyar River was due to dangerous levels of ammonia, hydrogen sulphide and unknown toxins in the water. Due to level. The issue was investigated after a massive fish kill in Pathalam and a tributary of the Periyar near Ernakulam district. According to the report, detailed chemical test results are needed to know from whence and where such large quantities of chemicals entered the water in Periyar. Officials have said that the preliminary investigation report has been submitted and further investigation is required beyond the presence of the accused. Chemicals, the committee also found that the oxygen level in the water was not very low.Official sources said there was a need to detect unknown toxins present at high levels in the water. "There is something wrong with the report of the State Pollution Control Board because they could not detect the presence of chemicals and toxins in the water. They had no reliable data set to test to identify the presence of chemicals. They are here There were lapses here. They did not monitor the pollution being released into the river," the source said, adding that the presence of chemical pollution was not detected in the report submitted by the State Pollution Control Board. And what is the reason for the death of fish?Based on the laboratory test results, the report has been sent to the Pollution Control Board Sub-Collector. The calculation of compensation for fish farmers is almost completed by the Fisheries Department. The fish farmers have filed complaints at police stations demanding legal recourse for compensation. Earlier, the police had registered a case of mass fish killing.