| Abstrakt: |
The present study was carried out to observe the hydrobiological parameters of selected shrimp farms near Navsari, Gujarat considering pond size, stocking density and culture practice. Water and plankton sampling was carried out for one summer crop during February to July 2022 from Aat, Karadi and Samapor shrimp farms, in Navsari. Three ponds were selected for sampling. The water parameters comprising of pH, temperature, transparency, salinity, dissolved oxygen (DO), biochemical oxygen demand (BOD), carbonate alkalinity, bicarbonate alkalinity, total alkalinity, calcium, magnesium, total hardness, total ammonia, nitrite-nitrogen, nitrate-nitrogen, phosphorus and hydrogen sulphide ranged from 7.51 to 8.73, 20 to 30°C, 8 to 107 cm, 17 to 34.7 ppt, 2 to 8.4 mg L-1, 0.6 to 5.2 mg L-1, 0.2 to 0.96 mg L-1, 112 to 359 mg L-1, 112.52 to 359.72 mg L-1, 150 to 400 mg L-1, 617 to 3048.90 mg L-1, 2987.00 to 8464.32 mg L-1, 0 to 0.98 mg L-1, 0 to 0.75 mg L-1, 0 to 0.46 mg L-1, 0 to 0.03 mg L-1 and 0 to 0.1 mg L-1, respectively. The majority of water parameters show significant (p<0.05) differences with respect to locations except for temperature, DO, magnesium, total ammonia and nitrate-nitrogen. Phytoplankton and zooplankton ranged from 29 to 16,880 Nos. L-1 and 10 to 404 Nos. L-1, respectively. Plankton density showed significant (p<0.05) differences with respect to locations. Throughout the culture period, 15 different species of phytoplankton and 8 different species of zooplankton were observed. The current study demonstrated that pond size and stocking density both had a significant impact on hydrobiological parameters. [ABSTRACT FROM AUTHOR] |
