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- W2600222209 abstract "An experiment in carp polyculture was conducted at Regional Agricultural Research Station, Parwanipur, Bara, Nepal for a culture period of six months (1st December 2014 to 31st May 2015) in a completely randomized design with five treatments (T1, T2, T3, T4, and T5) replicated thrice in 15 research units of 100 m2 each. Silver carp, bighead carp, rohu, mrigal and common carp were used as stocking materials in all the treatments @ 0.4, 0.2, 0.3, 0.05 and 0.05 fish/m2 respectively. Grass carp was used @ 0.0, 0.1, 0.2, 0.3, 0.4 fish/m2 in T1 (Control), T2, T3, T4 and T5 respectively. Fertilization was performed biweekly with urea and di-ammonium phosphate @ 0.4g N/m2/day and 0.1 g P/m2/day. Supplementary feed (mustard oil cake and rice bran) was supplied @ 2% body weight of common carp and mrigal. Chopped fresh para grass was provided @ 20% body weight of grass carp. The water quality parameters were within suitable range for fish culture. Extrapolated net fish yield (t/ha/yr) was found the greatest in T5 (2.98±0.07) among all treatments. T3 (2.79±0.18) and T4 (2.72±0.23) were significantly different from T1 (2.04±0.14) (p0.05). However, benefit cost ratio (B/C) was found the highest in T3 (2.86±0.17) among all treatments which was significantly different from T1 (2.20±0.11) (P0.05). The inclusion of grass carp reduced food conversion ratio of common carp and mrigal (1.59±0.11) in T3 as compared to T1 (2.07±0.48), which indicated that the excreta of grass carp acted as a source of feed for bottom feeders too. The result of this experiment indicated that grass carp stocked at 0.2 fish/m2 (T3) in carp polyculture proved a more profitable and cost effective than rest all the treatments." @default.
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- W2600222209 date "2016-07-01" @default.
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- W2600222209 title "Optimization of grass carp for supplementing feed and fertilizer in carp polyculture" @default.
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