• Decreased Performance of Rainbow Trout Oncorhynchus mykiss Emergence Behaviors Following Embryonic Exposure to Benzo[a]pyrene

      Ostrander, G.K.; Anderson, J.J. (United States Department of Commerce, National Oceanic and Atmospheric Administration, National Marine Fisheries Service, 1990)
      The sublethal effects induced by a model carcinogen and environmental contaminant on salmonid emergence behaviors have been studied. Rainbow trout embryos were exposed for 24 hours to 25 IAg/mL of benzo[a)pyrene 1 week prior to hatching. Exposures occurred during the late organogenesis period of development and allowed assessment of how a single embryonic exposure might affect emergence behaviors nearly 6 weeks later. Though no differences in numbers of alevins successfully emerging were observed, a significant decrease was noted in performance of the upstream orientation behaviors characteristic ofemergence among wild individuals.These findings are discussed in terms ofa model describing the role of upstream swimming behavior after emergence.