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Water budgeting in a carp‐prawn polyculture system: impacts on production performance, water productivity and sediment stack
Author(s) -
Mohanty Rajeeb K,
Mishra Atmaram,
Panda Dileep K,
Patil Dhiraj U
Publication year - 2016
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/are.12659
Subject(s) - polyculture , water use , productivity , water use efficiency , environmental science , water balance , biology , fishery , zoology , agronomy , aquaculture , irrigation , fish <actinopterygii> , geotechnical engineering , macroeconomics , economics , engineering
This study was designed to quantify the total water requirement and consumptive water use in carp‐prawn polyculture system under different water management protocols, using water balance model. Under different water management protocols, treatment‐wise estimated total water use, TWU (×10 4 , m 3 ) was 3.7, 4.6 and 3.9, while the computed consumptive water use index, CWUI (m 3 kg −1 biomass) was 6.62, 9.31 and 7.08, in T 1 (no water exchange), T 2 (periodic water exchange) and T 3 (regulated water exchange) respectively. Significantly higher yield ( P < 0.05) in both T 2 and T 3 over T 1 , was probably due to water exchange that improved the rearing environment. Although intensity of water exchange was more in T 2 , significant variation ( P < 0.05) in overall growth and yield was not recorded between T 2 and T 3 . Treatment‐wise sediment load ranged between 54.6 and 71.3 m 3 t −1 biomasses. Higher sediment load was recorded at lower intensity of water exchange as well as with higher apparent feed conversion ratio. Higher net total water productivity, net consumptive water productivity and OV ‐ CC ratio in T 3 infers that regulated water exchange has a distinct edge over the no water exchange protocol. Restricted water use instead of regular/excess water exchange not only improves the production performance and water productivity, but also helps in lessening the operational pumping cost.