Tolerance of juvenile black sea bass Centropristis striata to acute ammonia and nitrite exposure at various salinities |
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| Authors: | Charles R Weirich Marty A Riche |
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| Institution: | USDA-ARS Sustainable Marine Aquaculture Systems Program, Fort Pierce, FL 34946, USA |
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| Abstract: | ABSTRACT: Experiments were conducted to determine the acute tolerance of juvenile (mean weight ± standard error, 9.9 ± 0.9 g) black sea bass Centropristis striata to environmental un-ionized ammonia-nitrogen (NH3-N) and nitrite-nitrogen (NO2-N) exposure at various salinities. Specifically, median lethal concentrations (LC50 values) of NH3-N and NO2-N at 24, 48 and 96 h of exposure were determined at salinities of 10, 20 and 30 g/L at 22°C. With the exception of LC50 values determined at 48 h, median lethal concentrations of NH3-N to black sea bass were not influenced by environmental salinity; 24, 48, and 96 h LC50 values ranged from 0.81 to 0.85, 0.65–0.77, and 0.46–0.54 mg-NH3-N/L, respectively. In contrast, tolerance of black sea bass to environmental NO2-N was compromised at reduced salinities. Median lethal concentrations of NO2-N to fish at 24, 48 and 96 h of exposure ranged from 288.3 to 429.0, 258.4 to 358.8 and 190.0 to 241.9 mg-NO2-N/L, respectively. Results indicate that while juvenile black sea bass are relatively sensitive to acute NH3-N exposure, they are highly resistant to NO2-N exposure. |
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| Keywords: | ammonia black sea bass nitrite salinity |
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