Page 993 - The Toxicology of Fishes
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Estrogenic Effects of Treated Sewage Effluent on Fish in English Rivers      973













                                           Rainbow trout
                                       (Oncorhynchus mykiss)










                                  C1. Burwarton  A. Willington  B. Consett  C. Carlisle  D. Winsford






                                   C2. Beckettʼs  E. Shenfield  F. Nayland
                                      Well





                                  C3. Lowestoft  G. Salisbury  H. Derby  I. Leicester  J. Ashford






                                 C4. Itchen Valley  K. Horsham  L. Eastleigh  M. Rye Meads







                                   C5. Upwey   N. Trowbridge  O. Honiton







                       FIGURE 25.2 Induction of vitellogenin in rainbow trout (Oncorhynchus mykiss) placed in the effluent channel of 15
                       different sewage treatment works located throughout England. The fish were all males or immature females or mixed-sex
                       immatures. Control fish were maintained at fish farms, which were supplied with high-quality water.  The trout were
                       maintained in the cages for between 2 and 3 weeks, and the plasma was assayed for vitellogenin. Solid bars represent male
                       fish only, hatched bars represent immature females, and open bars represent immatures of mixed sex. Plasma vitellogenin
                       concentrations are means ± SEM and are presented on a log scale. All fish held in effluent had elevated concentrations of
                       plasma vitellogenin compared with their respective controls (p < 0.001). (Adapted from Purdom, C.E. et al., Chem. Ecol.,
                       8, 275–285, 1994.)
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