Logic
Assessing Research on Bass in the Potomac River
What problem were the researchers investigating?
The research was undertaken to assess whether the location of fish, specifically smallmouth bass and largemouth bass, downstream from wastewater treatment plants, is influencing the biological development of the fish with reference to the presence of cells associated with female reproductive systems developing on the testis of male fish.
Give the background of the problem
In 2003 a study was undertaken which identified that between 33% and 80% of the smallmouth bass in the South Branch of the Potomac river had some developmental abnormalities, with the presence of oocytes on the male fish testis. Oocytes are he cells which will develop into ovum for reproduction in females, and are usually absent in males. With the testicular oocytes observed on fish collected across different areas of the South Branch of the river it would appear that there was a causal factor impacting on the biological development of the fish. The results do not appear to have been flawed, as a subsequent study looking only at the Shenandoah Rover found even higher rates of this biological abnormality.
This abnormality is not totally unknown, it has been recorded before, but it is an unusual characteristic. The appearance of testicular oocytes is some types of fish are usually associated with exposure to certain types of chemicals which can interfere with the release of hormones into the bloodstream. The appearance of oocytes on the testis of fish is usually accepted as a biological market of certain types of chemical being present in the water. While the link between chemical exposure and the testicular abnormality has been established, there has not been any proof that the chemical which can cause this are in the Potomac.
It was also known that there was a waste water treatment plant on the Potomac, in other areas these are known to be one of several potential sources of the chemical which interfere with the hormones of the fish, but it is not a source that...
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