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| Titel: |
A food web based hypothesis for the survival vs. weight relationship of rainbow trout in an experimental stream study with bleached kraft mill effluent |
| Auteur: |
Hall, T. J. Haley, R. K. |
| Verschenen in: |
Human and ecological risk assessment |
| Paginering: | Jaargang 1 (1995) nr. 3 pagina's 296-305 |
| Jaar: |
1995-09 |
| Inhoud: |
A series of experimental streams studies carried out with biologically treated bleached kraft mill effluent (BKME) and rainbow trout Oncorhynchus mykiss included a variety of fish health parameters. There was a pattern of larger but fewer fish in BKME exposed streams. To determine if reduced fish numbers was a detrimental effect, we examined the relationship between number and weight for control and BKME exposed streams for the 9-month effluent exposures of 1.3-5.1% v/v. A regression analysis indicated that fish numbers decreased at a similar rate for corresponding fish size in both control and BKME-exposed streams. A dose-response relationship for effluent and fish number was not found, indicating that reduced fish number was not a direct expression of toxicity. The factors which induced BKME-exposed fish populations to tend toward fewer but larger fish were not determined but are hypothesized to relate to BKME food web stimulation, a related enhancement in trout growth, and a corresponding reduction in fish number. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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