The introduction of hunting in national parks will be delayed until at least June after an investigation found evidence of alleged illegal activity by a senior executive of the Game Council NSW, the taxpayer-funded body which is supposed to oversee the program.

Premier Barry O'Farrell told Parliament on Thursday afternoon he had ordered a review of the governance of the Game Council, which regulates hunting in NSW.

Premier Barry O'Farrell ... ordered review. Credit:Lee Besford

Mr O'Farrell said hunting in national parks would not begin until the government had received the review, which is due by May 31.

Mr O'Farrell said the review was prompted by Fairfax Media's report of a investigation into alleged illegal hunting by two Game Council employees on a property in outback NSW.