Whitebaiters looking forward to the opening of the new season tomorrow have been warned to avoid Christchurch's rivers due to faecal contamination.
Health experts said even before the earthquakes, the Garden City's waterways were contaminated with duck and dog faeces and rarely met recreational water standards.
But since the quakes, and more recently because of ongoing repairs to damaged wastewater infrastructure, there is an additional risk of human faecal contamination.
Canterbury medical officer of health, Dr Alistair Humphrey said eating whitebait caught in Christchurch's Avon and Heathcote rivers and the Avon-Heathcote Estuary is dangerous.
"People who choose to take whitebait from the Avon or Heathcote not only put themselves and others at risk but also spoil the season for other whitebaiters and consumers, as it makes us question whether any whitebait is safe to eat,'' he said.