Ceasg: The ceasg is a Scottish mermaid with the upper body of a woman and the tail of a young salmon.

Ceasg - Represents the dual nature of the sea as both a giver of life and a force of destruction, and may echo ancient practices of sea deity worship

Ceasg

Ceasg - Represents the dual nature of the sea as both a giver of life and a force of destruction, and may echo ancient practices of sea deity worship

The ceasg is a Scottish mermaid with the upper body of a woman and the tail of a young salmon. She is famed for granting three wishes and forming unions with humans, whose descendants are often blessed with maritime prowess. Though she can be protective, some tales depict her as monstrous, even swallowing heroes whole.

Origins & First Encounters

Source Texts & Tale Variants

Form & Powers

Regional Faces

Cultural Parallels

Legacy & Modern Evolution

Interesting Fact

Unlike typical mermaid legends that confine these beings to the open ocean, the ceasg bridges both freshwater and marine environments, and her myth may be a vestige of ancient sea deity worship in Scottish culture.

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Quick Creature Info

Associations:

Element: WaterWaveMaiden's form

Our Mythic Legendary Rating:

Mythic Ember
Mythic Ember rating

Also Sometimes Known As:

maighdean na tuinnemaighdean mhara

Habitat:

Water bodiesAquaticScotlandInhabits both marine and freshwater environments, bridging the gap between the open sea and inland watercoursesSea, rivers, and streamsCoastal areas and inland waterways

Supernatural Powers:

Wish grantingInfluence over waterProtective guidance for human descendants

Physical Attributes:

Upper body of a beautiful womanTail of a grilse (young salmon)GracefulAquatic hybrid form

Abilities:

Capable of inhabiting both marine and freshwater environmentsMystical allureProtective instincts towards her human lineage

Behavior:

Ambiguous, ranging from benevolent and nurturing to dangerous and monstrousForms unions with humans, occasionally marries them, and exhibits both protective and destructive tendencies according to different tales

Weaknesses:

Life force contained in a special egg

Lore:

A mythological mermaid who grants wishes, forms unions with humans, and influences maritime fortunes while embodying both nurturing and destructive qualitiesScottish folkloreRepresents the dual nature of the sea as both a giver of life and a force of destruction, and may echo ancient practices of sea deity worship

Related Creatures, Tales or Lore

References

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Curated by the Mythological Creatures Team

Series editor: Mythological Creatures Directory

Primary desk: Northern & European Folklore Desk

(rev. November 2025)