Traditionally, fish that spend at least part of their lives in brackish or fresh water were considered unsuitable for sashimi because of the possibility of parasites. For example, salmon, an anadromous fish, is not traditionally eaten straight out of the river. A study in Seattle, Washington, showed that all wild salmon had roundworm larvae capable of infecting people, while farm-raised salmon did not have any roundworm larvae. However a study commissioned by the Pew Foundation found that total organic contaminants were consistently and significantly more concentrated in the farmed salmon as a group than in wild salmon.