Acute toxicity of ammonia in Meagre (Argyrosomus regius Asso, 1801) at different temperatures |
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| Authors: | Mehmet Kir Mustafa Topuz Murat Can Sunar Havva Topuz |
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| Affiliation: | Faculty of Fisheries, Mugla Sitki Kocman University, Mugla, Turkey |
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| Abstract: | Argyrosomus regius (3.0 ± 0.9 g) were exposed to different concentrations of ammonia in a series of acute toxicity tests by the static renewal method at three temperature levels (18, 22 and 26°C) at a pH of 8.2. Low temperature clearly increased the tolerance of the fish to total ammonia nitrogen (TAN) and unionized ammonia (NH3) (P < 0.05). While the 96‐h LC50 values of TAN were 19.79, 10.39 and 5.06 mg L?1, the 96‐h LC50 of NH3 were 1.00, 0.70 and 0.44 mg L?1 at 18, 22 and 26°C respectively. The safe levels of NH3 for A. regius was estimated to be 0.10, 0.07 and 0.04 mg L?1 at 18, 22 and 26°C respectively (P < 0.05). This study clearly indicates that A. regius is more sensitive to ammonia than other marine fish species cultured on the Mediterranean and Eastern Atlantic coasts. |
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| Keywords: |
Argyrosomus regius
ammonia toxicity temperature
LC
50
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