A DEAL to expand duck hunting shows the NSW government is hostage to the Shooters and Fishers Party, Greens MP John Kaye says.

A bill to enable the $4 billion ports privatisation, to allow the long-term leasing of Port Botany and Port Kembla, is likely to pass parliament today, after an agreement was struck with the Shooters and Fishers party over its duck hunting bill, News Ltd has reported.

The government and the shooters have been locked in negotiations for weeks over the ports bill, with the minor party demanding support for its duck-hunting legislation in return.

The shooters want the Game Council to have sole control of the granting of duck hunting licences to farmers - a responsibility currently shared with the National Parks and Wildlife Service.

Dr Kaye, who opposes the 99-year leases for Port Botany and Port Kembla, said the coalition had "made itself hostage to a party that received less than 3.7 per cent of the vote".

Under the Shooters party bill, duck hunting would "become much more widespread", Dr Kaye said.

"It's now clear that the deal has been done between the Shooters and Fishers and the O'Farrell government to privatise Port Kembla and Port Botany in return for duck hunting," Dr Kaye said in a statement.

"The ports are a profit-making public asset that will inevitably be handed over to the private sector at less than their long-term value to the state's economy.

"Along with the legalisation of silencers and shooting in national parks, the shooters are steadily extracting their agenda from the O'Farrell government."