Sea Slug



The Sea Slug is an underwater creature known to manufacture raw ADAM. It is apparently indigenous to the sea bed around Rapture, and is utilized in the city to help create ADAM, and in turn, Plasmids.

In order to produce the ADAM that is known to the citizens of Rapture, the slugs must first go through the embedding process. The embedding process is the implanting of the slug into a small child, specifically, a young girl, aged 6-7. Through this procedure, the young girl becomes a Little Sister, and the slug creates ADAM with the child as its host. The ADAM is then regurgitated by the Little Sister and can be used to purchase Plasmids at a Gatherer's Garden.

Over the course of Bioshock, Jack encounters none to multiple sea slugs, depending on whether or not he harvests of rescues the Little Sister he obtains. These sea slugs are shown to be a brownish-black color, with bio luminescent spots on its exterior.

Bioshock 2
During Bioshock 2, the slugs can be seen when walking outside in the Atlantic Ocean around Rapture. There are mentioned to be drifting or lying on the sea floor. Subject Delta can then pick them up to supply himself with ADAM.