Siyokoy: The Siyokoy is an aquatic humanoid creature from Philippine mythology, noted for its fish-like features such as scales, webbed limbs, and fins.

Siyokoy - The Siyokoy serves as a cautionary figure, embodying the dangers hidden in Philippine waters and reflecting the complex interplay of indigenous beliefs and historical influences.

Siyokoy

Siyokoy - The Siyokoy serves as a cautionary figure, embodying the dangers hidden in Philippine waters and reflecting the complex interplay of indigenous beliefs and historical influences.

The Siyokoy is an aquatic humanoid creature from Philippine mythology, noted for its fish-like features such as scales, webbed limbs, and fins. It is renowned for its hostile nature toward humans, often attacking by drowning them. The creature’s blend of indigenous and Chinese-influenced attributes underscores its unique place in Southeast Asian folklore.

Origins & First Encounters

Source Texts & Tale Variants

Form & Powers

Regional Faces

Cultural Parallels

Legacy & Modern Evolution

Interesting Fact

Unlike many mermaid legends that portray their subjects as enchanting and benign, the Siyokoy is distinctly malevolent, serving as a potent emblem of the dangers lurking beneath the surface of Philippine waters.

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Quick Creature Info

Associations:

Element: Water

Our Mythic Legendary Rating:

Mythic Ember
Mythic Ember rating

Also Sometimes Known As:

SyokoySiokoy

Habitat:

water bodiesWaterPhilippinesOften found in both freshwater and marine environments throughout the Philippine archipelago.Aquatic environments (rivers, lakes, oceans)Philippine waters

Supernatural Powers:

Capable of drowning victimsAggressive and predatory nature

Physical Attributes:

scaleswebbed limbsfinsaquatic adaptationsnatural fish scaleswebbed extremities

Abilities:

Enhanced aquatic locomotionPowerful swimming via webbed limbs and tail finNatural armour provided by scalesAdaptation to aquatic environment

Behavior:

HostileAggressive towards humans; known to attack and drown those who venture near its watery domain

Lore:

Aquatic predator and malevolent water spiritPhilippine mythologyThe Siyokoy serves as a cautionary figure, embodying the dangers hidden in Philippine waters and reflecting the complex interplay of indigenous beliefs and historical influences

Related Creatures, Tales or Lore

References

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Curated by the Mythological Creatures Team (rev. May 2025)