Abstract
In fish there is a close association between endocrine and immune function that during seasonal changes in reproductive status can affect the fishes susceptibility to parasitic infection. The effects of endocrine-disrupting pollution on this association are not known. The present study investigates the effects of a chemically polluted (ammoniacal nitrogen, zinc, bromide) discharge in Cranleigh Waters, a river in southern England, on the fecundity and parasitism of chub, Leuciscus cephalus, over an 18-month period. In the polluted site, the gonado-somatic index (GSI) of fish was lower in females and higher in males compared to an unpolluted upstream site, indicating an androgenic effect on reproduction. Parasite species richness, especially the intestinal helminths Proteocephalus torulosus and Pomphorynchus laevis, was increased in fish in the polluted site. However, the occurrence of the two most common parasite species in the river—Myxobulus sp. 1, a gill myxozoan, and Diplostomum sp., a trematode found in the eye—was unchanged between polluted and unpolluted river sites. Nevertheless, there was a significant relationship between GSI and the prevalence of these two parasite species in the unpolluted site but not the polluted site suggesting that endocrine disruption of reproduction did not lead to an increase in host susceptibility. The reasons for this are discussed.
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Acknowledgments
We would like to thank the staff of Thames Water for their assistance in this study. This article is dedicated to the late Professor Henry Costa, formerly Head of the Department of Zoology, University of Kelaniya, Colombo, Sri Lanka, whose considerable input to the collection of fish data was undertaken during his period of sabbatical leave of absence from Kelaniya spent in the School of Biological Sciences, Royal Holloway, University of London.
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Morley, N.J., Costa, H.H. & Lewis, J.W. Effects of a Chemically Polluted Discharge on the Relationship Between Fecundity and Parasitic Infections in the Chub (Leuciscus cephalus) from a River in Southern England. Arch Environ Contam Toxicol 58, 783–792 (2010). https://doi.org/10.1007/s00244-009-9386-8
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DOI: https://doi.org/10.1007/s00244-009-9386-8