Effects of Feminization on Wild Fish Breeding
Author Information
Author(s): Catherine A. Harris, Patrick B. Hamilton, Tamsin J. Runnalls, Veronica Vinciotti, Alan Henshaw, Dave Hodgson, Tobias S. Coe, Susan Jobling, Charles R. Tyler, John P. Sumpter
Primary Institution: Institute for the Environment, Brunel University
Hypothesis
Do endocrine-disrupting chemicals (EDCs) adversely impact the reproductive success of wild fish populations?
Conclusion
Feminization of male fish significantly reduces their reproductive performance, especially in severely affected individuals.
Supporting Evidence
- Intersex fish were able to breed, but their success varied based on the severity of feminization.
- In the first study, body length correlated with reproductive success, while in the second, reproductive performance decreased with intersex severity.
- The most feminized individuals showed a 76% reduction in reproductive performance.
Takeaway
Some male fish are turning into females because of chemicals in the water, and this makes it harder for them to have babies.
Methodology
Two competitive breeding experiments were conducted using wild roach, with DNA microsatellites used to determine parentage and reproductive success.
Limitations
The study's findings may not directly apply to wild populations due to unknown factors like natural breeding colony sizes and sex ratios.
Participant Demographics
Wild roach (Rutilus rutilus) from contaminated rivers in the UK.
Statistical Information
P-Value
p<0.0001
Statistical Significance
p<0.0001
Digital Object Identifier (DOI)
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