Mishra, AshutoshSanwal, Neha2022-10-122022-10-122022-07https://krishikosh.egranth.ac.in/handle/1/5810188812The present study was conducted from December 2021 to May 2022 (165 days) to evaluate the effect of aquamimicry culture system on water quality and fish growth. The objective of this work was to compare the effect of this technology on various parameters viz. water quality, plankton production and fish performance. The experiment was carried out in 12 rectangular FRP tanks kept indoor in poly carbonate house (size 4 m³ each) stocked with 40 fingerlings/ m3 in three groups of fishes viz. Catla (T1), Rohu: Mrigal @ 1:1 (T2) and Rohu: Mrigal: Silver Carp: Grass Carp: Amur Common Carp @ 30 :10 :15: 15: 30 (T3) in triplicate and one set of control for each group. After stocking, the experimental fish were fed with 50% required feed in aquamimicry treatments and 100% required feed was given in control units. After 165 days of experimentation period (December to May), the data were analyzed and compared. The physical parameters viz. Temperature, electrical conductivity and total dissolved solids were analyzed which varied from 16.2-32.3°C, 150-500 μS cm-1 and 220.5-357.8 mgL-¹, respectively and the value of chemical parameters pH, dissolved oxygen, total alkalinity, hardness, salinity, ammonia, phosphate and biochemical oxygen demand varied from 7.5- 8.7, 3.22-7.15 mg L-¹, 160- 220 mg L-¹, 170-220 mg L-¹, 0.17-0.26 psu, 0.01-0.24 mg L-¹, 0.002-0.74 mg L-¹ and 1.15- 4 mg L-¹, respectively. There was no negative impact of aquamimicry fish culture system on water quality parameters. Treatment tanks also showed better average phytoplankton: zooplankton ratio with best ratio in treatment T2 as compared to control tanks, as well as higher plankton diversity i.e. 13 zooplankton varieties in treatment tanks and 9 zooplankton varieties in control tanks. The result indicates that aquamimicry fish culture tanks shows higher specific growth rate in Catla 1.80 % day-1 as compared to the 1.60 % day-1 in Control tanks. Feed Conversion Ratio values also decreased from 1.443-2.3 in control tanks to 0.728-1.4 in treatment tanks. Protein Efficiency Ratio values ranged from 2.96 to 5.7 in treatment tanks as compared to 1.7-2.8 in control tanks. The better survival rate among various fish species has also been recorded in aquamimicry culture system treatment T2. There was 33.40 to 37.87% decrease in the cost of production and benefit - cost ratio reached 3.05 in treatment T1, 2.29 in treatment T2 and 2.32 in treatment T3. This indicates that even without intensification, the production can be increased with increased economic output in the aquamimicry culture system.EnglishThesis