The Presence And Effect Of Endocrine Disruptors
On Reproductive Organs Of Fish In A Reservoir
Used For Aquiculture
Author(s)
L. S. Shore & M. Gophen
Abstract
A reservoir receiving some sewage water from an urban area, in addition to fresh
water sources, was used for raising three species of fish. Prior to the
introduction of the fish, the reservoir water contained appreciable amounts of
testosterone, estrogen, ethinylestradiol and medroxyprogesterone. After
introduction of the fish the level of hormones and drugs were reduced to nearly
non-detectable levels while in a control reservoir without fish, the levels of the
compounds remained constant. Of the three species studied, after eight months
only the female carp developed gonads, which were small for body size.
Observations suggest that the fish absorb the hormones and drugs in the early
growing season and this has a negative effect on their reproductive development.
Keywords: endocrine disrupters, ethinylestradiol, gonadal atrophy, carp, tilapia.
1 Introduction
Household, industrial and agricultural (recycled effluents) water sources are
liable to contain Endocrine Disrupting Agents (EDAs). The EDAs are a
heterologous group which can influence the endocrine system of various
organisms [5] and to cause endocrine disruption in the parent organism or its
offspring. In particular, chemicals that bind to the receptor of the natural
hormone can mimic or depress the actions of the natural ligand. These
compounds have been demonstrated to affect wildlife and domestic animals but
their effects in humans are not well documented [5, 8, 9]. In the last two decades,
there has been an increased awareness of the effects of these compounds on
animals and man and this has been reflected in scientific publications as well as
Keywords
endocrine disrupters, ethinylestradiol, gonadal atrophy, carp, tilapia.
Related Book
Other papers in this volume
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