Defra - Department for Environment, Food and Rural Affairs.

Science Search

Science and Research Projects

Return to Science Search homepage   Return to Project List

Endocrine disruption of reproduction in top predator fish - CB01011

Many of what are often considered the best documented examples of endocrine disruption in wildlife have featured aquatic organisms, possibly because the aquatic environment is the ultimate sink for most chemicals, and hence aquatic organisms may receive higher exposures than terrestrial organisms. These studies have focused primarily on one species of freshwater fish, the roach (Rutilis rutilis), which is often the commonest fish in many waters and which comprises a significant proportion of the diet of the predatory fish present. Hence, if chemicals are responsible for the endocrine disruption observed in the roach, it is possible that these could accumulate in predators eating affected roach (and other species), leading to effects occurring in these predators. To date, there are no reports of endocrine disruption occurring in any top predator. This project addresses this gap in our knowledge, by determining whether or not endocrine disruption is occurring in top predator fish.


To seek evidence of endocrine disruption in three species of top predator fish, namely pike (Esox lucius), perch (Perca fluviatilis), and zander (Stizastedion lucioperca; sometimes called pike-perch).
Project Documents
• Executive Summary : A Search for Evidence of Endocrine Disruption in Top Predator Fish   (23k)
Time-Scale and Cost
From: 2001

To: 2004

Cost: £70,277
Contractor / Funded Organisations
University - Brunel
Endocrine Disruptors              
Environmental Protection              
Fish Health              
Hazardous substances              
Fields of Study
Chemicals and Nanotechnology