Intersex white suckers (Catostomus commersoni) were collected in Boulder Creek and the
South Platte River downstream of wastewater treatment plant (WWTP) effluent but not at
reference sites. Eighty-three percent of the 60 white suckers collected downstream of the

… Widespread Sexual Disruption in Wild Fish … health problem. In this paper, we
demonstrate a high incidence of intersexuality in wild populations of riverine fish (roach;
Rutilus rutilus) throughout the United Kingdom. These reproductive …

The incidence of intersex was examined in freshwater fish in one English and three French
rivers. Over 331 fish, mainly roach, were sampled above and below the major sewage
treatment works (STW) on each river and the incidence of intersex was recorded by

… In particular, the occurrence of intersex fish in a number of countries has been
associated with the proximity of these fish to point source sewage effluent discharges
(Allen et al. 1999a, 1999b; Aravindakshan et al. 2004; Folmar et al …

… Wild Intersex Roach (Rutilus rutilus) Have Reduced Fertility 1 … Search for other works by this author
on: Oxford Academic. PubMed. Google Scholar. AC Henshaw AC Henshaw. 5. Environment
Agency National Coarse Fish Farm, Calverton, Nottinghamshire NG14 6F2, United …

… The GSI value for intersex fish was closer to male GSI values, suggesting that the sampled intersex
fish were more likely to have occurred from the feminization of male catfish … No cases of intersex
fish have been reported in any other South African fish species …

… At Thwaite Weir, for example, more than half of the gonad in 40% of the intersex fish
was comprised of ovarian tissue … No intersex fish were found at Crossflats, although
97% of all the fish sampled (n = 32) at this site were female …

… There is widespread concern that intersex fish are reproductively compromised, with
potential population-level consequences … Results. In both studies, the majority of intersex
fish were able to breed, albeit with varying degrees of success …

… UK and European epidemiological data sets have clearly demonstrated the occurrence
of intersex fish (fish with gonads containing male and female tissue, and/or feminized
reproductive ducts) and its association with effluent discharges …

… Each histological section of the intersex fish gonad was scored according to an intersex
index by assigning the following values: 0, normal male; 1, ⩽2 oocytes; 2, 3–10 oocytes;
3, 11–20 oocytes; 4, 21–30 oocytes; 5, >30 oocytes per section …