Lobster Mobster and Da Shrimp are recurring antagonists from The Little Mermaid television series. They are bumbling con-artists and constantly antagonize Ariel and her friends. They are modeled after the stereotypes of the gangsters from the 1920s.
Their first appearance was the episode, "Urchin". Here, they meet an orphaned mer-boy named Urchin and swindle him into working for them, while posing themselves as something he desires: friends. Eventually, he meets Ariel, who convinces him that Lobster Mobster and Da Shrimp are not his allies and are just using him.
Later, they appeared in "Double Bubble", where they kidnapped a troublesome pair of baby mertwins that Ariel babysat to gain their mother’s pearl necklace.
The duo also appeared in the episode "Thingamajigger".