Effect of Water Variables On Lead Tolerance in Postlarvae of Penaeus Indicus (H. Milne Edwards) |
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Authors: | Satyavathi Chinni Ritindra N. Khan V. Uma Devi Prabhakara Rao Yallaprgada |
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Affiliation: | 1. Department of Zoology , Andhra University , Visakhapatnam, 530 003, India;2. Department of Biology , Armstrong Atlantic State University , 11935 Abercorn Street, Savannah, GA, 31419, USA |
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Abstract: | Lead tolerance in Penaeus indicus post-larvae (PL) was studied in relation to the water variables: salinity, temperature and pH. the LC50 for 96 hrs was 7.22 ppm at ambient conditions of salinity (20%o), temperature (29°C) and pH (7.2). the post-larvae were found to be sensitive to salinity variations with a significant (P < 0.05) low LC50 values at lower (2%o) and higher (29%o) ranges. Though a decrease in LC50 value was observed both at higher (45°C) and lower (10°C) temperatures, it was significantly (P < 0.05) low only at higher temperature indicating more toxicity. the LC50 values also showed a significant (P < 0.05) decrease in acidic (pH 2.8) and alkaline (pH 11.0) conditions. the data indicate that lead toxicity increases in the PL of P. indicus with variations in the water variables. |
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Keywords: | Prawn (Penaeus indicus) lead tolerance salinity temperature pH |
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