- "The Colombian Cartel is making SPANK somewhere in Liberty City, but we don't know where. And they seem to know everything we're doing before we do! We got ourselves a rat. There's a guy named Curly Bob who works the bar at Luigi's and he's been throwing more money around than he's earning. He ain't pimping or pushing, so he must be talking!"
- ―Salvatore Leone
Salvatore tells Claude that someone in the Leone Family is a rat, selling secrets to the Colombian Cartel who are manufacturing SPANK somewhere in Liberty City. Salvatore tells Claude to follow Curly Bob, a barman at Luigi's Sex Club 7 who has been spending more money than he earns at Luigi's.
Claude drives over to Luigi's and follows Curly Bob, who takes a taxi to Portland Harbor, where he meets Catalina and Miguel of the Cartel. Catalina hands Bob the SPANK, with Bob then telling them of the Leone Family's problems with the Triads and the Forelli Family. After Catalina and Miguel leave, Claude kills Curly Bob.
RewardThe reward for completing the mission is $15,000. However the mission Bomb Da Base: Act I will only be unlocked if the player has finished Blow Fish.
- Curly Bob's taxi will not appear on the radar but a 'spookometer' appears warning the player if they get too close. This is the only use of a 'spookometer' in the entire game, though it reappeared in later games in the series.
- If Claude grabs his own taxi and parks it behind Curly Bob's taxi. Curly Bob will enter Claude's Taxi. This makes the mission much easier as the player now simply needs to drop Curly Bob at Portland Harbor instead of having to tail him and risk spooking him.