Jamshedpur, June 30: The main reason for the death of fish in the pond (Jayanti Sarovar) located at Jubilee Park is the high level of ammonia in the water and lack of oxygen.
The above disclosure has come to the fore in the investigation of Fisheries Research Center, Ranchi.
After the matter of death of fish in abundance came to light, the Director of Fisheries Department had ordered an inquiry into it. After which, on June 19, a four-member team from Ranchi came to Jamshedpur and took samples of pond water, silt etc.
The team examined some samples on the spot. While the rest was tested in the laboratory located in Ranchi Shalimar. There were eight types of tests done.
In which, except one or two parameters, other parameters were found to be unfavorable for fish living in the pond. The investigation report has also been sent to Tata Steel by the department.
On the other hand, when asked in this regard, District Fisheries Officer Alka Panna said that even in the preliminary investigation, lack of oxygen was said to be the reason for the death of the fish. However, the situation became completely clear after the investigation in the laboratory. The investigation report has been sent to Tata Steel. Along with this, suggestions have been given regarding the maintenance of the pond on the basis of the parameters obtained in the report.
Under the water quality parameter of the pond, the water temperature should be between 26-32 degree Celsius. While 37.6 was found in the first sample test and 34.4 in the second sample test. Similarly, under the criteria, the amount of dissolved oxygen in water should be more than 4 ppm. However, in the test of both the samples, the amount of oxygen was found to be equal to it.
The amount of carbon dioxide in water should be less than 15 ppm. While its quantity was found to be 24 and 20 in the investigation. Similarly, the pH standard of water should be between 7.3 to 8.5. Whereas 8.6 and 8.5 were found in the investigation.
The amount of alkalinity in water should be between 60-200 ppm. Whereas 225 ppm was found in the investigation. The amount of ammonia in water should be less than 0.5 ppm. Whereas 4.0 ppm was found in the investigation.
The four-member team from Fisheries Research Center Ranchi included Fisheries Extension Officer (FEO) Ranvijay Kumar, Fisheries Extension Supervisor Sawan Sheela Hansda and two lab technicians.
The investigation team found that the color of the water of the pond is green. This is due to the high amount of organic load and phytoplankton. The investigation team found the color of the soil of the pond to be black. Which is due to the high amount of organic matter.
After investigation, the team has given some suggestions to Tata Steel UISL, which manages the pond. In which water exchange (water solution) can be done to increase the amount of dissolved oxygen in the pond. Especially in the evening, use of aerator or water pump or 02 Mact tablets at the rate of 2 kg per hectare and toximer at the rate of 10 kg per acre can be used. Julite can also be used in place of toximer. Similarly, keeping the amount of oxygen in the water high can reduce the toxicity of ammonia. The investigation team has advised to refrain from giving food to the fish till the situation improves.
