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International Journal of Aquatic Biology، جلد ۲، شماره ۳، صفحات ۱۵۵-۰
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عنوان انگلیسی Acute toxicity of alkali and alkaline earth metals on Rohu, Labeo rohita (Hamilton) egg and hatchlings
چکیده انگلیسی مقاله The acute toxicity of salts of alkali and alkaline earth metals, such as sodium (Na), potassium (K), calcium (Ca) and magnesium (Mg) were studied on the egg and larval stages of Indian major carp Labeo rohita (Hamilton). The acute toxicity experiments were conducted followed by the range finding bioassay tests. The experiments were conducted in triplicates. The cumulative percentage of dead or damaged eggs at the end of 6, 12, 18, 24, 36, 48, 60, 72 and 96 hours was recorded for the calculation of LC 50 . The increase in salt concentrations in water increased their toxicity and reduced the duration to damage 50% of the eggs. The eggs became smaller than their normal size and whitish before being damaged in the test solutions. Most of the exposed eggs and hatchlings tended to lay on the floor of the tank. The toxicity of the metals was in the order of K>Na>Mg>Ca. The 96 hours LC 50 values were 3.25, 2.73, 28.9 and 20.52 ppm for sodium, potassium, calcium and magnesium, respectively.
کلیدواژه‌های انگلیسی مقاله Alkali and alkaline earth metals, Bioassay, LC50, rohu
نویسندگان مقاله anusaya mallick | anusaya mallick
university of kalyani


bikash کاندرا mohapatra | bikash chandra mohapatra
central institute of freshwater aquaculture, indian council of agricultural research , bhubaneswar- 751 002, orissa, india.


niranjan sarangi | niranjan sarangi
central institute of freshwater aquaculture, indian council of agricultural research , bhubaneswar- 751 002, orissa, india.
نشانی اینترنتی http://npajournals.com/ijab/index.php/ijab/article/view/123
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