- Joined
- Jun 8, 2003
- Messages
- 290
Steve O'Shea;90867 said:One of the postgrads here, Ann Bui, did a survey of heavy metal contamination in snapper, kahawai and school shark last year. She found excessive levels of cadmium, copper, zinc and lead in BOTH FISH FILLET AND LIVER tissues from fish collected in Manukau Harbour and Hobson Bay, Waitemata Harbour - two very popular fishing spots.
Check out the mecury levels in trout from the volcanic plateau area - particularly Rotorua, Taupo & downstream Waikato River. The levels have been well known since the 1960s but strangely the studies have never been widely publicised. From memory the amount of fish that is safe to eat from some of the Rotorua lakes is less than 30 gm per day, 120 g/d from Taupo: you don't read that in the travel posters! . . . . and we won't even mention the radioactive isotopes derived from burning coal and dumping the residue ash waste which leached into the Waikato River- one (apocryphal?) story is that a student sent samples overseas for testing on a whim and the testers contacted them urgently saying the Nuclear Powerstation upstream must have a leak. Any thought of testing your fish samples for isotopes?