Indeed, but it is a fair question to ask: what is the actual concentration in the ocean? I did not read the study, possibly they used a concentration similar to the one encountered in oceans.
Seeing as this is about salmon, it’s probably more relevant to ask about the concentration in rivers. A river downstream from a reasonable size city likely has a not insignificant level. I assume the ocean is effectively nothing though.
Indeed, but it is a fair question to ask: what is the actual concentration in the ocean? I did not read the study, possibly they used a concentration similar to the one encountered in oceans.
Seeing as this is about salmon, it’s probably more relevant to ask about the concentration in rivers. A river downstream from a reasonable size city likely has a not insignificant level. I assume the ocean is effectively nothing though.