Effects of environmental pH and calcium on ammonia toxicity in channel catfish
The 24-hour median lethal concentrations (24-hour LC50) of total ammonia nitrogen (TA-N) to channel catfish (Ictalarus punctatus) at pH 7, 8, and 9 (total hardness, 40 mg/l; temperature, 21-25 C) were 263.6 ± 11.3 (SE), 38.8 ± 1.8, and 4.5 ± 0.2 mg/l, respectively. The 24-hour LC50 of un-ionized amm...
| Main Authors: | , , , |
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| פורמט: | Journal article |
| שפה: | English |
| יצא לאור: |
1980
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| _version_ | 1826257281386283008 |
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| author | Tomasso, JR Goudie, C Simco, B Davis, K |
| author_facet | Tomasso, JR Goudie, C Simco, B Davis, K |
| author_sort | Tomasso, JR |
| collection | OXFORD |
| description | The 24-hour median lethal concentrations (24-hour LC50) of total ammonia nitrogen (TA-N) to channel catfish (Ictalarus punctatus) at pH 7, 8, and 9 (total hardness, 40 mg/l; temperature, 21-25 C) were 263.6 ± 11.3 (SE), 38.8 ± 1.8, and 4.5 ± 0.2 mg/l, respectively. The 24-hour LC50 of un-ionized ammonia nitrogen (UIA-N) concentration at pH 8 was significantly higher (1.82 ± 0.06 mg/l) than at pH 7 or 9 (1.39 ± 0.06 and 1.49 ± 0.12 mg/l). Enrichment of the water to 440 mg/l total hardness at pH 7 significantly increased the 24-hour LC50 of TA-N and UIA-N (356.3 ± 16.4 and 1.79 ± 0.07). Fish exposed to 25 mg/l TA-N for 12 hours at pH 7 and 8 showed no differences from control fish in hematocrit percent total plasma protein, or plasma and muscle chloride. Plasma sodium showed no difference between control and experimental groups at pH 7: however, a significant decrease occurred in fish exposed to 25 mg/l TA-N at pH 8. No differences in blood pH were found between the control groups and fish exposed to 100 and 200 mg/l TA-N at pH 7, and to 10 and 25 mg/l TA-N at pH 8. Plasma sodium depletion is suggested as a contributing mechanism of ammonia toxicity. |
| first_indexed | 2024-03-06T18:15:41Z |
| format | Journal article |
| id | oxford-uuid:04882d2f-0175-4c03-9fd9-75b32860f209 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T18:15:41Z |
| publishDate | 1980 |
| record_format | dspace |
| spelling | oxford-uuid:04882d2f-0175-4c03-9fd9-75b32860f2092022-03-26T08:52:16ZEffects of environmental pH and calcium on ammonia toxicity in channel catfishJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:04882d2f-0175-4c03-9fd9-75b32860f209EnglishSymplectic Elements at Oxford1980Tomasso, JRGoudie, CSimco, BDavis, KThe 24-hour median lethal concentrations (24-hour LC50) of total ammonia nitrogen (TA-N) to channel catfish (Ictalarus punctatus) at pH 7, 8, and 9 (total hardness, 40 mg/l; temperature, 21-25 C) were 263.6 ± 11.3 (SE), 38.8 ± 1.8, and 4.5 ± 0.2 mg/l, respectively. The 24-hour LC50 of un-ionized ammonia nitrogen (UIA-N) concentration at pH 8 was significantly higher (1.82 ± 0.06 mg/l) than at pH 7 or 9 (1.39 ± 0.06 and 1.49 ± 0.12 mg/l). Enrichment of the water to 440 mg/l total hardness at pH 7 significantly increased the 24-hour LC50 of TA-N and UIA-N (356.3 ± 16.4 and 1.79 ± 0.07). Fish exposed to 25 mg/l TA-N for 12 hours at pH 7 and 8 showed no differences from control fish in hematocrit percent total plasma protein, or plasma and muscle chloride. Plasma sodium showed no difference between control and experimental groups at pH 7: however, a significant decrease occurred in fish exposed to 25 mg/l TA-N at pH 8. No differences in blood pH were found between the control groups and fish exposed to 100 and 200 mg/l TA-N at pH 7, and to 10 and 25 mg/l TA-N at pH 8. Plasma sodium depletion is suggested as a contributing mechanism of ammonia toxicity. |
| spellingShingle | Tomasso, JR Goudie, C Simco, B Davis, K Effects of environmental pH and calcium on ammonia toxicity in channel catfish |
| title | Effects of environmental pH and calcium on ammonia toxicity in channel catfish |
| title_full | Effects of environmental pH and calcium on ammonia toxicity in channel catfish |
| title_fullStr | Effects of environmental pH and calcium on ammonia toxicity in channel catfish |
| title_full_unstemmed | Effects of environmental pH and calcium on ammonia toxicity in channel catfish |
| title_short | Effects of environmental pH and calcium on ammonia toxicity in channel catfish |
| title_sort | effects of environmental ph and calcium on ammonia toxicity in channel catfish |
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