| Unofficial name
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Pearl's lack of a mother is a reference to the phrase "mother of Pearl," which Mr. Krabs often says when something surprises him. Stephen Hillenburg is against revealing the identity of Mrs. Krabs and has kept it a secret throughout the series. For this reason, it is unknown if Mrs. Krabs is a whale or is part whale, much like Mr. Krabs. 
The exclamation "mother of Pearl!" is used in the following episodes, usually by Mr. Krabs:
- "MuscleBob BuffPants"
- "The Smoking Peanut"
- "Selling Out"
- "The Main Drain"
- "Squirrel Record"
- "Eek, an Urchin!"
- "Married to Money" - She is mentioned when Mr. Krabs says he may have found Pearl a new mother.
This list is incomplete, but you can help Encyclopedia SpongeBobia by expanding it.