ISSN:
1432-0703
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Energietechnik
,
Medizin
Notizen:
Abstract Whole brain dopamine (DA) and norepinephrine (NE) levels were measured in sexually maturing (2 years+) male and female rainbow trout,Oncorhynchus mykiss, following ≍posure to 0.01 mg/L hydrogen cyanide (HCN). Following a 12 day exposure period in July and August 1988, whole brain DA levels of HCN exposed fish were significantly higher (p 〈 0.05), relative to control fish, as measured by high performance liquid chromatography (HPLC). Brain NE levels were unaffected by HCN exposure. Whole brain DA and NE levels showed a strong correlation in control fish (r=+0.81), but not in HCN exposed fish (r=+0.28), likely due to altered DA levels in the latter group. No significant differences were found in brain DA and NE levels between males and females. Mean diameters of oocyte from ovaries of the vitellogenic females were significantly (p 〈 0.01) reduced from 226 to 183 μm in control and HCN exposed fish respectively. Testes from males revealed significantly (p 〈 0.001) higher numbers of spermatogonial cysts in HCN exposed fish. Evidence is given that chronic exposure to sublethal levels of HCN significantly alters brain DA levels in both sexes of rainbow trout, reduces growth in vitellogenic oocytes of the ovary in females and interferes with the passage of spermatogonia to the spermatocyte stage in sexually maturing males. Collectively, these results suggest that sublethal HCN affects the reproductive mechanisms via the hypophyseal-gonad axis in sexually maturing rainbow trout.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF01055571
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