A study was undertaken to assess productivity and growth performance of Indian major carp in selected micro water sheds of Udaipur district of southern Rajasthan. For this purpose, abiotic and biotic parameters of water quality and fish growth performance parameters [such as, net weight gain (NWG), net length gain (NLG) and specific growth rate (SGR)] were considered as a response parameters. A total four micro-watersheds of Udaipur were selected for this study. Water quality parameters viz., temperature (26.2-32.2°C), pH (7.3-9.4), dissolved oxygen (6.71-8.02mg/l), free CO2 (Nil), total dissolved solids (181.85-257mg/l), electrical conductivity (377.5-530.5mS/cm), total hardness (113-164mg/l), total alkalinity (68-114mg/l), Gross primary productivity (0.119-0.252gC/m³/h), Net primary productivity (0.033-0.141gC/m³/h) and community respiration (0.017-0.181gC/m³/h) were recorded. Result of physico-chemical parameters indicating that the quality of water in microwater sheds is congenial for growth of Indian major carp. The phytoplankton counts in different micro-watersheds were ranged from 150 to195 nos/ml. On the other hands, the counts of total zooplankton in different water bodies were less (3 to 9 Nos/l). The net weight gain of catla, rohu and mrigal was 762.38-935.71, 639.31-824.47and 395.15-652.99, respectively. Whereas, the specific growth rate of catla, rohu and mrigal were 2.009-2.093, 1.990-2.102 and 1.838-2.045%, which indicated that all the micro water sheds having moderate productivity and can be utilized for the aquaculture purpose. [ABSTRACT FROM AUTHOR]
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