| Autor: |
Phillip M. Allred, John R. Strange, Donald J. Fletcher |
| Rok vydání: |
1978 |
| Předmět: |
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| Zdroj: |
Journal of Environmental Science and Health . Part A: Environmental Science and Engineering. 13:501-515 |
| ISSN: |
0360-1226 |
| DOI: |
10.1080/10934527809374829 |
| Popis: |
Channel catfish were exposed to elevated levels of phosphate in three different experimental regimes with cardiac and opercular rates being monitored by the use of unimplanted electrodes. Fish exposed to 20 mg/l phosphate, in 2 mg/l increasing increments, had peak mean cardio‐opercular rates at 12 mg/l. The elevated cardiac rates were significant at both the 10 and 12 mg/l concentrations. Fish exposed to 160 mg/l phosphate, in 20 mg/l increasing increments, had peak mean cardio‐opercular rates at 20 mg/l. The fish exposed to 20 mg/l phosphate in 5 mg/l increments, maintained at 20 mg/l for a two week period and then returned to zero in 5 mg/l increments had cardio‐opercular rates similar to those of the two acute studies. During the 2 week continuous exposure to the 20 mg/l phosphate the mean cardiac rate increased 8% and the opercular rate decreased 13%. At the termination of this experiment both the cardiac and opercular rates returned to their pre‐experiment levels. Previous work by Cairns and... |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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