The eelpout (Zoarces viviparus) is strongly affected by xenobiotics (e.g endocrine disrupting chemicals), one of which is suspected to be nonylphenol (NP). The project investigates the endocrine disrupting chemical, NP, its effect on the eelpout, and how it degraded from nonylphenolethoxylates (NPE) into NP during water treatment. Scientifical literature is used to describe how NP finds its way to the aquatic environment, which kind of endocrine disrupting effect it has and how the eelpouts life and hormone cycle works. Previous studies are used to describe NP’s endocrine disrupting effects on the eelpout and other fish species. This study concludes that NP is discharged into the aquatic environment from the water treatment plant. During the water treatment NPE decomposes into NP. The non-branched chains of NP de-compose completely during aerobe process, while the branched chained NP’s are discharged to the aquatic environment and is afterwards consumed by the prey of eelpouts. Experiments show that NP in high concentrations has an effect on adult male eelpouts. This is shown by change in shape and size of the testicles. The em-bryos of the eelpout are expected to be more sensitive to endocrine disrupted chem-icals, than grown eelpouts. This is seen by deformities in the eyes, head and spine. The embryos are affected even at concentrations which has no effect on the adult eelpouts. The cocktail effect (mixture of chemicals) can contribute to an increased effect and clear/more visual deformities. In addition NP is able to bioaccumulate, so it is possible that NP has a damaging endocrine disrupting effect on its own, if the concentration is high enough.
|Educations||Basic - Bachelor Study Program in Natural Science, (Bachelor Programme) Basic|
|Publication date||17 Jan 2014|
- Hormonforstyrrende stoffer