• Rajanna, C.
• Shivananda Murthy, H.

An experiment was conducted in cement cisterns to determine the effect of different organic manures i. e., cow-dung and poultry manure on physico-chemical parameters of water in carps (Catla catla, Labeo rohita and Cyprinus carpio) rearing ponds during fry to fingerling stage when they are reared together. Ponds were applied with organic manures viz., cowdung (T1: CD), poultry manure (T2: PM) and cowdung + poultry manure (T3: CD+PM) @ 10,000 kg/ha, 5000 kg/ha and 5,000+5,000 kg/ha respectively. Fry were stocked @ 30/m2 in the ratio of 4:3:3 (Catla: Rohu: Common Carp) to all treatment and replication tanks. Periodically physico-chemical water quality parameters were recorded. The result revealed that, physico-chemical parameters were found within the productive range for all the treatments. The mean dissolved oxygen level for the period of study was highest in PM treatments followed by CD and CD+ PM treatments. The mean carbon dioxide level was highest in CD treatment (8.33 ppm). Average concentration of carbonate alkalinity varied from 0.00 to 12.00 ppm in PM treatment. The maximum bicarbonate alkalinity of 56.33 ppm was recorded in PM treatment. The maximum nitrate concentration observed was 7.78 mg/L in PM treatment on the 1st week after fertilization. . However, the difference in pH between treatments was non-significant. The pH of water remained slightly alkaline throughout the period of experiment.

Organic Manures, dissolved oxygen, cow dung, poultry manure, nitrites

"Impact of cow-dung and poultry manure on physico-chemical parameters of water in fish rearing ponds", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 2, page no.227-236, February-2019, Available :http://www.jetir.org/papers/JETIR1902F10.pdf

"Impact of cow-dung and poultry manure on physico-chemical parameters of water in fish rearing ponds", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 2, page no. pp227-236, February-2019, Available at : http://www.jetir.org/papers/JETIR1902F10.pdf