Rainbow trout were first released into the Kai Iwi Lakes in 1968. Fingerlings were initially released into Lakes Taharoa and Waikere. The Lakes offer excellent trout fishing conditions. Trout weighing up to 4kg have been caught.
The lake fisheries are managed by the Northland Fish & Game Council. Each year the Society releases 2,000 trout fingerlings into the lakes. All persons fishing at the lakes are required to hold licenses, these can be obtained from licensed agents and sports shops in Dargaville.
In August 2011 the Fish & Game Council has reported that the fish stock health and quality is the very best it has been over the last 15 years.