Just how polluted are our waters?

Just how polluted are our waters?

I saw a film yesterday discussing how many of the fish we eat are laden with worms and must be protected from bacterial and fungal infections. Hence, the fish caretakers lift the fish in batches out of the water and give each fish inoculations to keep them healthy and alive. So much for the healthy fish diet. We must keep our waters clean and clean up the messes we have ignored for too many years.