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Österholm, Mats, 2003. Dubbelkönighet hos mört : normalt eller miljöinducerat?. SLU, Dept. of Forest Mycology and Plant Pathology, Uppsala. Uppsala: SLU, Dept. of Forest Mycology and Plant Pathology



A number of chemical agents, and their degradation products, have been
recognized as having estrogenic activity on animals. On fish they interfere with
endogenous estrogen and in many cases mimic its activity, thus increase estrogenic
reponse, with elevated levels of vitellogenin. Hence they are called Endocrine
Disrupting Chemicals, EDCs. Vitellogenin levels is often used as a biomarker of
exposure to estrogenic pollutants. Wastewater from sewage treatment works
contains chemicals known as EDCs, and there are evidence of roach (Rutilus
rutilus) living in recipients of such wastewater having traits of both gender, i.e.
oocytes in male gonads (intersex) on histological examination.

This study was done on roach living in Lake Funbosjön Uppland, Sweden. The
lake is a recipient of drainage water from a local refuse dumping area. We also
investigated a group of roach that had been kept in laboratory environment for 4-5
years. They were captured in Ekoln, a part of Lake Mälaren.

The results of the study showed only one intersex individual from Lake Funbosjön
out of 39 males. The laboratory roach had a higher incidense of intersex; 7 out of
26 males had oocytes in testis.

The conclusion of the study is that intersexuality on roach is a complex
phenomenon, possibly induced by natural variation and environmental factors. The
material in the study is relatively small, and further investigations need to be done.

Main title:Dubbelkönighet hos mört
Subtitle:normalt eller miljöinducerat?
Authors:Österholm, Mats
Supervisor:Norrgren, Leif
Series:Examensarbete / Sveriges lantbruksuniversitet, Fakulteten för veterinärmedicin och husdjursvetenskap, Veterinärprogrammet
Volume/Sequential designation:2003:53
Year of Publication:2003
Level and depth descriptor:Other
Student's programme affiliation:3050A Veterinary Medicine Programme (admitted before July 1, 2007) 330 HEC
Supervising department:(NL, NJ) > Dept. of Forest Mycology and Plant Pathology
Keywords:mört, dubbelkönighet, intersex, fisk
Permanent URL:
Subject. Use of subject categories until 2023-04-30.:Pollution
Animal physiology - Reproduction
Deposited On:17 Nov 2017 10:36
Metadata Last Modified:17 Nov 2017 10:36

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