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Researcher Anusuya, Devi P.
Advisor Padmavathy, P.
Source KrishiKosh-Indian National Agricultural Research System
Content type Text
Educational Degree Master of Science (M.Sc.)
Publisher Fisheries college and Research Institute, Thoothukudi
File Format PDF
Language English
Subject Domain (in DDC) Technology ♦ Agriculture & related technologies ♦ Hunting, fishing & conservation ♦ Home & family management
Subject Keyword Fisheries Environment ♦ Alkalinity ♦ Ammonia-n ♦ Total Dissolved Solids ♦ Fisheries Resource Management ♦ Aquatic Environment Management
Abstract The present investigation was carried out in Poondi reservoir, Thiruvallur district Tamilnadu to assess the water and sediment quality characteristics at the cage and control sites, where in cage culture has been already initiated by the state Fisheries Department. The water samples were collected once in fifteen days at a depth of 0.5m, 1.0m and 1.5 m in the cage site and 0.5m and 1.5m in the control site. Thisstudy was carried out for a period of 8 months from September, 2014 to April, 2015. The various physico-chemical parameters such aswater temperature, pH, dissolved oxygen (DO), salinity, hardness, alkalinity, ammonia-N (NH3-N), nitrite-N (NO2-N), nitrate-N (NO3-N), phosphate- P (PO4-P), sulphate, chemical oxygen demand (COD), biological oxygen demand (BOD), total suspended solids (TSS) and total dissolved solids (TDS) were analyzed in the water samples. The collected sediment samples were analyzed for their characteristics such aspH, electric conductivity, total organic carbon, total nitrogen and available phosphorous. The total plate count (TPC) and feacal indicator bacteria such as E.coli and faecal streptococci were also assessed fortnightly in the water samples.Water temperature values ranged from 26 to 34.9ºC in cage culture site at Poondi reservoir. The hardness values ranged from 49.04 to 260.26 mg/l as CaCO3.The alkalinity values ranged from 14 to 160 mg/l at cage and control sites. There was no significant difference in temperature, pH, dissolved oxygen and hardness value between cage and control sites (P>0.05). The dissolved oxygen values ranged from 4.00 to 6.00mg/l at cage and control sites. The sulfate concentration was found within the limit as prescribed by BIS (2003).The nutrients such as ammonia and nitrate concentrations were found slightly higher at cage site compared to control sites and the values increased towards the depth. The COD values ranged from 8.00 to 75mg/l and the BOD values ranged from 0.3 to 3.05mg/l at cage and control sites. The total suspended solids were found higher at cage site than control site, due to increased suspended matters. All the water quality parameters analysed were observed within the permissible range for fish culture and drinking purpose. In the sediment samples, lowpH was observed at cage culture site and might be due to the decomposition of organic matter. The EC value ranged from 2.81 to 55.99mS/cm and found higher at cage site. TOC values ranged from 0.47 to 3.33%both at cage and control site. The total sediment nitrogen value was found higher at control site. The available phosphorous values ranged from 5.97 to 29.85mg/100g. The total plate count (TPC) was higher at cage site during rainy season. The faecal indicator bacteria such as E. coli and feacal streptococci were undetectable, which indicates the reservoir water is safe for drinking purpose.The optimum water and sediment quality characteristics observed at cage culture site clearly showed that the small cage farming in the reservoir does not have major environmental impacts on the water and sediment quality.
Educational Use Research
Education Level UG and PG
Learning Resource Type Thesis
Publisher Place Tamil Nadu
Owner Jawahar, P. ♦ Srinivasan, A.
Size (in Bytes) 1.22 MB