What argument supports the idea that viruses are alive ?

There is a debate if viruses are alive because a virus contains its own DNA.  However, most consider it to not be alive, since it cannot reproduce on its own.

poor water quality affects most estuarine organisms, including commercially important fish and shellfish. the pollutants that have the greatest impact on the health of estuaries include toxic substances like chemicals and heavy metals, nutrient pollution (or eutrophication), and pathogens such as bacteria or viruses.

search in internet u can get it