
	Pakistan Journal of Biological Sciences
	Year: 2006 \| Volume: 9 \| Issue: 12 \| Page No.: 2215-2221 DOI: 10.3923/pjbs.2006.2215.2221

Acute Toxicity of Ammonia to Common Carp Fingerlings (Cyprinus carpio) at Different pH Levels

Hossam H. Abbas

Abstract: The toxicity (LC₅₀) of total and un-ionized ammonia was tested on different sizes (5, 10, 15 g) of common carp Cyprinus carpio maintained at three different pH levels within the range of 6.5-8.5. Within the same pH, the toxic effect of ammonia was independent of fish size. In addition, the toxicity of un-ionized ammonia increased at lower pH. However, total ammonia exerts some measure of toxicity and/or increased H⁺ concentration increases the toxicity of un-ionized ammonia. Common carp fingerlings (15 g) were exposed to the 96 h LC₅₀ of un-ionized ammonia (0.93 mg NH₃-N/L) at pH 7.5. Changes in hemoglobin (Hb), hematocrit (Ht), sodium (Na⁺), potassium (K⁺), glucose, aspartate aminotransferase (AST), alanine aminotransferase (ALT) and lactate dehydrogenase (LDH) were recorded. Blood Hb decreased after 6 and 96 h of exposure while Ht decreased after 3 h of exposure. Serum Na⁺ and K⁺ increased during the experimental period (96 h). Glucose concentration increased initially and then returned to less than the control value after 96 h of exposure. There was a significant decrease in AST, ALT and LDH activities after 6 h of exposure, after which enzyme activity increased until the end of the experimental period.

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How to cite this article:

Hossam H. Abbas , 2006. Acute Toxicity of Ammonia to Common Carp Fingerlings (Cyprinus carpio) at Different pH Levels. Pakistan Journal of Biological Sciences, 9: 2215-2221.

DOI: 10.3923/pjbs.2006.2215.2221

URL: https://scialert.net/abstract/?doi=pjbs.2006.2215.2221

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