Reproductive and tolerance effects of chronic fluoranthene exposure in a laboratory population of fathead minnows
- Miami Univ., Oxford, OH (United States)
An on-going full life cycle, multigeneration exposure is being conducted to assess the long-term effects of fluoranthene exposure in the presence of solar ultraviolet radiation on the fathead minnow. An experimental population of 200 fish has been exposed to 7.9 {mu}g fluoranthene{sm_bullet}{vert_bar}{sup {minus}1} continuously from juvenile stage through breeding. The Fl generation has been hatched and reared to adult stage within isolation chambers in the exposure tank. During the 16 wk breeding period egg production in the exposed population averaged 75% relative to an identical control population. hatching success of exposed eggs, and larval survivorship to 10 days, were 61% and 44% of controls respectively. No larval growth differences were detected. A test for tolerance acquisition in the exposed population using replicate 96 hr LC50 values revealed no significant difference between the populations. However, the distribution of concentration-mortality values suggested that the two populations responded differently to exposure. To examine this apparent difference eggs were removed from the exposure tank, hatched, and larvae were reared in uncontaminated water. These fish were then simultaneously exposed with identically treated control fish to 27.4{mu}g fluoranthene{sm_bullet}{vert_bar}{sup {minus}1}. The LT50 time for control fish (120 hr) was shorter than the LT50 time exposed fish (146 hr). These results suggest that differential egg production and hatching success, as well as larval survivorship, has resulted in genetic adaptation to fluoranthene exposure.
- OSTI ID:
- 37503
- Report Number(s):
- CONF-9410273--
- Country of Publication:
- United States
- Language:
- English
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