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Endocrine disruption, parasites and pollutants in wild freshwater fish

Published online by Cambridge University Press:  10 November 2003

S. JOBLING
Affiliation:
Department of Biological Sciences, Brunel University, Uxbridge, Middlesex, UK
C. R. TYLER
Affiliation:
School of Biological Sciences, Hatherly Laboratory, Exeter University, Exeter, Devon EX4 4PS, UK

Abstract

Disruption of the endocrine system has been shown to occur in wild freshwater fish populations across the globe. Effects range from subtle changes in the physiology and sexual behaviour of fish to permanently altered sexual differentiation, impairment of gonad development and/or altered fertility. A wide variety of adverse environmental conditions may induce endocrine disruption, including sub-optimal temperatures, restricted food supply, low pH, environmental pollutants, and/or parasites. Furthermore, it is conceivable that any/all of these factors could act simultaneously to cause a range of disparate or inter-related effects. Some of the strongest evidence for a link between an adverse health effect, as a consequence of endocrine disruption, and a causative agent(s) is between the condition of intersex in wild roach (Rutlius rutilus) in UK rivers and exposure to effluents from sewage treatment works. The evidence to indicate that intersex in roach (and other cyprinid fish living in these rivers) is caused by chemicals that mimic and/or disrupt hormone function/balance in treated sewage effluent is substantial. There are a few parasites that affect the endocrine system directly in fish, including the tape worm Ligula intestinalis and a few parasites from the micropsora phylum. L. intestinalis acts at the level of the hypothalamus restricting GnRH secretion (resulting in poorly developed gonads) and is one of the very few examples where an endocrine disrupting event has been shown to result in a population-level effect (reducing it). It is well established that many parasites affect the immune system and thus the most common effect of parasites on the endocrine system in fish is likely to be an indirect one.

Type
Research Article
Copyright
© 2003 Cambridge University Press

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