DOC rangers, police, Waimakariri District Council and Christchurch City Council staff and patrolled the Ōtākaro/Avon, Waimakariri, Kaiapoi, Pūharakekenui/Styx rivers and Otipua/Saltwater Creek speaking to hundreds of fishers. Photo: DOC Hundreds of whitebaiters came under scrutiny on several Canterbury waterways last week, including the Avon, Styx, Waimakariri and Kaiapoi rivers and Saltwater Creek.