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Subject: Fisheries × Author: MORE RUTUJA., × End date: 2020 × Start date: 2010 × Type: Thesis ×
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    ThesisItemOpen Access
    IMPACT OF SHRIMP FARM EFFLUENTS ON WATER QUALITY IN THE COASTAL WATER OF UTTAR KANNADA
    (KARNATAKA VETERINARY, ANIMAL AND FISHERIES SCIENCES UNIVERSITY, BIDAR, 2019) MORE RUTUJA.,; LAKSHMIPATHI M.T)
    Impact of shrimp farm effluent on the receiving coastal waters was studied from stocking to harvesting period for one complete culture cycle (120 days). The present study was conducted on three shrimp farms in the Uttar Kannada district at Ankola and Kumta, an area representative for the impacts of shrimp culture. Fortnightly sampling was carried out at eight stations from March 2019 to June 2019. During this study period shrimp farm effluent was subjected to detailed analysis and its possible impact was recorded. Physico-chemical and biological characteristics in relation with hydrographical parameters were studied to determine the water quality of inlet and outlet area of adjacent creek waters. The present study revealed that the shrimp farm directly release effluent into creek water during water exchange without any treatment. This discharge of effluent made an impacts on water and sediment quality (Temperature, dissolved oxygen, pH, salinity, ammonia-nitrogen, nitrite-nitrogen, nitrate-nitrogen, phosphate-phosphorous, organic carbon, plankton and chlorophyll-a). The values of Do (< 3 mg/L), ammonia (< 40.26 μg-at/l), BOD (˃ 18 mg/L), COD (˃ 30 mg/L) and sediment organic carbon (4.4%) and planktonic biomass (0.54 – 5.12 mg/m³)) the chlorophyll-‘a’ (˃ 0.33 mg/m³) was observed. The investigation showed increased load of receiving waters by direct release of shrimp farm effluent to surrounding coastal waters. The effluents contained high amount of solids and nutrients generated from uneaten food material, shrimp excreta, which increased the concentration during discharge period. The water and sediment values were found to be increasing with the end of culture period. Among this parameters water temperature, DO, BOD, salinity, pH and nutrients showed wide range of fluctuations at outlet in creek. The study revealed that the shrimp farm effluent discharge have negative impact on receiving coastal waters bodies.