Sea slug is not kosher according to Jewish dietary law. Not kosher. Sea slugs are shell-less gastropod molluscs — the same category as snails and abalone.

What is the scientific name of Sea slug?

The scientific name of Sea slug is Nudibranchia.

Does Sea slug have fins and scales?

Sea slug does not meet the requirement of having both fins and removable scales. Leviticus 11:9-12 requires fish to have both fins and scales to be considered kosher.

Can I eat Sea slug sushi or sashimi?

No. Since Sea slug is not kosher, it should not be consumed in any preparation, including sushi or sashimi.

Where can I find more information about whether Sea slug is kosher?

KosherFish.co references the Orthodox Union (OU) and Chabad lists of kosher and non-kosher fish. For specific halachic questions, consult your local Orthodox rabbi.

Sea slug

Nudibranchia

Not Kosher

Description

Nudibranch sea slugs aren't eaten.

Sea slugs live in marine waters worldwide, from the Arctic through the tropics to the Southern Ocean around Antarctica. They turn up at nearly all depths, from the intertidal zone to well past 700 meters, with the most variety on warm shallow reefs.

Also known as

Nudibranch

Sea slug in foreign languages

Scientific	Nudibranchia
Hebrew	חשופיות ים
Arabic	عاريات الخيشوم
Spanish	Nudibranquios
Portuguese	Nudibrânquios
French	Nudibranches
Italian	Gymnobranchia
German	Nacktkiemer
Russian	Голожаберные
Chinese	裸鰓類
Japanese	裸鰓類
Korean	갯민숭달팽이
Thai	ทากทะเล
Indonesian	Biku

Warnings & Kosher Issues

A shell-less gastropod mollusk, the same category as snails, with no fins or scales, so it is not kosher.
Many store stinging cells or toxins from their prey for defense, which is one reason they aren't eaten.