Growth Response of Cirrhinus mrigala Fry to Azolla (Azolla pinnata) - incorporated Diets
2014
B., Gangadhar | N., Sridhar | S., Saurabh | C.H., Raghavendra | K.P., Hemaprasanth | M.R., Raghunath | P., Jayasankar
This experiment of 75 days duration was conducted in out-door circular cement tanks (1000 l) with added soil bottom. Growth and survival of Cirrhinus mrigala fry, fed with pelleted feed containing varied levels of dried azolla was evaluated. Tanks were fertilized initially with cow dung at 4 t ha-1 followed by 0.5 t ha-1 fortnightly. Additionally, urea and single super phosphate were also applied at 10 and 15 kg ha-1 at fortnightly intervals. Control feed contained 45% groundnut oil cake plus 45% rice bran and 10% finger millet flour added as binder for pelleting. Dried azolla powder was incorporated into the feed at 10, 20, 30 and 40% levels, replacing the groundnut oil cake and rice bran proportionately. C. mrigala fry was stocked in all the tanks @ 0.3 milion ha-1, ten days after fertilization. Major water quality parameters were analyzed at fortnightly intervals. Incorporation of azolla did not affect (p>0.05) the water quality, growth and survival of fingerlings at harvest. However, 40% azolla incorporated diet showed significant reduction (p<0.05) in length of mrigal fingerlings. Incorporation of azolla in the diet reduced the cost of feed (Rs 100 g biomass-1) from 3.52 (control feed) to 2.86 (40% azolla feed) with a cost saving of 18.75%. Considering no difference between the control and 40% azolla incorporated diets with regard to fish weight and survival at harvest, incorporation of azolla in diet of C. mrigala up to 40% is recommended during fry to fingerling rearing for cost saving.
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