Police have recovered a massive amount of cannabis on board a yacht in Marlborough.

25-kilograms was found on the 55 foot yacht moored at Waikawa Bay.

Along with the drugs, the yacht and two smaller boats, a taser was also seized.

A 45-year-old man was arrested on board, while a 51-year-old was arrested in Picton and the 64-year-old owner of the vessel was arrested in Christchurch.

All three will appear in court on a raft of drug charges.