Determination on efficacy of selected common water quality treatment chemicals and drugs used in Bangladesh

Abstract

This experiment “determination on efficacy of common selected water quality treatment drugs and chemicals used in aquaculture in Bangladesh” was conducted for two months in pond at Freshwater Station Mymensingh, BFRI. Experiment was designed into four treatment (T1 -Timsen, T2 -Geofersh, T3 -Geoprime, and T4 –Geotox, Recommended dose of the company was used for treatment), with three replications. This experiment was conducted by using twelve ponds having an area of 40.00 m2 each & average depth was 1.2 m. Twelve ponds were prepared through liming @ 250 kg/ha after drying of pond. After 5 days of liming each of the following drugs Timsen, Geofresh, Geoprime, Geotox was used for each pond. After 3 days of using drugs fingerlings of Gift Tilapia, (ABW: 6.25 ± 0.27 gm), were stocked in all the ponds with same stocking density of 100 fish/pond. Feeding fingerling was maintained twice daily in the morning & evening with commercial Saudi-Bangla feed at the rate of 10% of the body weight in the first week. For second week daily ration was adjusted at the rate of 5% of the body weight. Data on water quality parameters, survivality, and growth were recorded before and after using of drugs. Essential water quality parameters were recorded weekly and growth, survivality were recorded after ten days interval. Histological studies were done 1 month’s interval. It was observed that after using drugs in all treatments the value in case of Timsen pH (8.12±0.58), alkalinity (119.40±9.67), nitrate (0.28±0.04) and phosphate (1.00±0.19), dissolved oxygen (4.56 ± 0.29), were maintained. Ammonia became reduced due to use of drugs. During observation of physical water quality parameters transparency (31.27±3.06) became increased and temperature (28.25±3.38) became lower than control water body. Net production of Gift Tilapia (1955.6 4± 24.28 kg/ha) also provided higher in Timsen treated pond than other treated ponds. Timsen treated pond provided higher tilapia production due to water quality of Timsen treated pond was more optimum than other drugs treated ponds. Histopathological study did not show any negative changes on the organ of fishes. Among all the drug, Timsen was the best in all aspects (improve tilapia fish health and water quality). Other three drugs (Geo-tox, Geo-fresh, and Geo-prime) resulted more or less same result.