New Zealand Food Safety has removed the public health warning against collecting shellfish on the North Island's east coast, as paralytic shellfish toxin levels have returned to safe limits. However, the warning remains for lobsters caught between Hicks Bay and Mahanga Beach due to toxin levels still exceeding safe limits. These toxins, which can cause serious illnesses such as paralysis and respiratory failure, cannot be eliminated through cooking. The public is advised to remove lobster guts before cooking to prevent toxin spread.