A commercial fishing vessel is at the centre of a gas leak in Tauranga Harbour this morning.

Fire Service northern shift manager Megan Ruru said the boat, which was tied up at a wharf alongside seafood company Sanford, was leaking gas from its refrigeration unit.

The area around the vessel had been cordoned off as firefighters and a specialist hazardous unit looked to stem the leak.

Ruru said the leak had been isolated and work was underway to vent the system.

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Firefighters were liaising with the ship's operator to solve the problem.

Ruru said it was unclear how many were on board the vessel.