author(s)
Gaurav Shankar Tripathi, Girish Tripathi, Paramveer Singh, Shriparna Saxena and Mukta Singh

abstract
This experiment was conducted to assess the water quality comparative study under bottle aquaponic Tank (AT) and Normal controlled Tank (NT) with early fingerlings of Trichopodus trichopterus (Blue gourami) as fish. During this 45 days study we used three distinct kinds of plants like; tomato (Solanum lycopersicum), Eggplant (Solanum melongena) and Spinach (Spinacia oleracea). Two experimental medium sized tanks of (2ftx1ftx1.5ft) used as rearing purpose and bottles of capacity near about 1 liter that accommodate riverine small pebbles as grow bed. Experimental feed of 30% protein was used as a diet for fish having ingredients Rice bran 17%, Soya bean 36%, Curry leaves 12.5%, Chicken liver 27% and Moringa 2.1%. This whole experiment was mainly based upon a water quality parameter like pH, Dissolved Oxygen, Temperature, Ammonia, Nitrite, Nitrate and one- fourth of the tank water is exchanged with fresh water in every 15 days. During starting days of the experiment (1-5 days) all parameters were same in both systems at optimum level but After 5-15 days water quality parameters were start showing fluctuations in NT like; pH 7.6-7.8, Ammonia 0.25-2.50,Nitrite 0-1.0, Nitrate 0-3.5mg/l and similarly pH 7.6-7.7, Ammonia 0-0.50, Nitrite 0-0.25, Nitrate 0 mg/l in AT system respectively. At the end of the experiment, water quality parameters were showing drastic changes that was pH 7.8-6.8, Ammonia 3-4, Nitrite 2-3, Nitrate 4-5 mg/l in NT system and pH 7.7-7.2, Ammonia 0.25, Nitrite 0, Nitrate 0 mg/l in AT system respectively. We observed in this experiment that optimum range of nitrate can be produce for better plant growth by aquaponic system.