Effect of different amounts of feeds on growth and production of fishes in pond polyculture

An experiment was carried out to evaluate the effects of different amounts supplementary feeds on growth and production fishes in polyculture where four species such as rui (Labeo rohita), mrigal (Cirrhinus mrigala), common carp (Cyprinus carpio) tilapia (Oreochromis niloticus) were cultured 6 ponds under three treatments, each with two replications. Eighty fish per decimal stocked along stocking ratio 1:1:1:1 all treatments. Supplementary rice bran wheat (1:1), at amount 5% body weight applied 2 (treatment I) well 3% used II) III) control no feed used. Urea T.S.P fortnightly rate 60 g decimal-1 90 decimal-1, respectively Physico-chemical biological factors air water temperature, transparency, rainfall, pH, dissolved oxygen, free CO2, total alkalinity, PO4-P NO3-N, phytoplankton zooplankton studied limnological conditions more or less similar experimental The calculated gross net productions treatment I, II III 8.87 7.33 ton ha-1 yr-1, 7.12 5.58 yr-1 4.69 3.16 respectively. Percent increased I 231.97% 176.59% higher than that (control). present study reveals feeding culture should be done fertilization because are very important enhance significantly.
 Int. J. Agril. Res. Innov. Tech. 10(2): 128-136, December 2020