Papers by Rama Nanda Mishra
Aquaculture and Fisheries, 2018
Carp polyculture is commonly practiced throughout south Asia, but traditional aquaculture methods... more Carp polyculture is commonly practiced throughout south Asia, but traditional aquaculture methods often lead to low fish yields from ponds in this region. Two trials were conducted to evaluate the benefits of adding Nile tilapia and sahar to carp polyculture ponds. The first trial was conducted in 9 earthen ponds for 240 days. This on-station trial stocked ponds with three separate treatments: a) carp only (C); b) carp þ tilapia (C þ T); and c) carp þ tilapia þ sahar (C þ T þ S). Combined net fish yield at harvest was significantly higher in the C þ T þ S trial (2.58 ± 0.10 t$ha À1 $crop À1) compared to the C trial (2.01 ± 0.26 t$ha À1 $crop À1). Additionally, gross margin (output value minus input costs) was significantly higher in the C þ T þ S trial (2357 ± 211 USD/ha) compared to the C trial (1300 ± 316 USD/ha), but not compared to the C þ T trial (1569 ± 177 USD/ha). Next, an on-farm trial was conducted in 12 farmermanaged earthen ponds for 165 days. This trial focused on two treatment types: a) C and b) C þ T þ S. Combined net fish yield at harvest was significantly higher in the C þ T þ S trial (2.78 ± 0.39 t$ha À1 $crop À1) compared to the C trial (2.06 ± 0.14 t$ha À1 $crop À1). Gross margin was also significantly higher in the C þ T þ S trial (3219 ± 367 USD/ha) compared to the C trial (1800 ± 250 USD/ ha). The use of these alternative species, along with traditional carp, has the ability to increase fish yield and raise profits in polyculture systems.
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Papers by Rama Nanda Mishra