| Autor: |
Hall, Lenwood W., Pinkney, Alfred E., Horseman, Larry O., Finger, Susan E. |
| Zdroj: |
Transactions of the American Fisheries Society; November 1985, Vol. 114 Issue: 6 p861-868, 8p |
| Abstrakt: |
Numerous factors have been implicated in the decline of striped bass Morone saxatilis along the east coast of the United States. This study was designed to evaluate the effects of contaminants and water quality on survival of striped bass larvae in a natural spawning habitat (Nanticoke River, Maryland). Larvae were tested in chambers submerged in the river. Organic and inorganic contaminants and water quality variables were monitored to correlate survival of larvae with habitat quality. In two 96-h experiments at three river stations, 90–99% of larvae died whereas control mortality was only 15–25%; the differences were significant. None of the 69 organic contaminants specifically analyzed were detected in river water and can be eliminated as causes of larval mortality. Of the eight metals analyzed, seven never exceeded 50 µg/L in river water, but total aluminum concentrations were 480–4,100 µg/L (39–181 µg/L filtered sample). Factors suspected as contributors to mortality were low pH (6.0–6.8), high aluminum concentrations, and the softness of the fresh river water (23–136 mg/L total hardness). |
| Databáze: |
Supplemental Index |
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