Blow Fish is the last mission in Grand Theft Auto III given to protagonist Claude by Leone Family Caporegime, Toni Cipriani from his mother's restaurant in the Saint Mark's district of Portland, Liberty City.
Claude goes to Momma's Restaurante and finds Toni, who informs Claude that he has had enough with the Triads and wants to force them out of Liberty City. Toni says that 8-Ball has rigged a Trashmaster with some explosives, which is to be placed between gas canisters at the Turtle Head Fishing Factory in Callahan Point. Claude drives to Eightballs Autoyard to collect the Trashmaster, which he then drives carefully over to Callahan Point, so as not to detonate the explosives before he reaches the plant, although he has time limit of two and a half hours. The Triads open the gates to the plant, allowing Claude to park the Trashmaster between two gas canisters. Claude sets the explosives to detonate and retreats to a safe distance, with the plant being destroyed shortly after.
- After this mission, the Factory will not spawn anymore Triad guards and their fish vans. But it's still accessible since the gates will open to their fish vans.
- During the final part of the factory explosion, it will actually "rain" fish, but due to the large explosions covering the screen, it is very hard to notice.