Fish

No mythological origin narrative for a distinct supernatural 'fish entity' is attested in the provided sources. The materials present fish in biological and cultural-historical terms (e.g., evolutionary history and long-standing human use as food) rather than as creatures with a mythic cosmogonic origin.

As described in scientific and summary sources, fish are aquatic vertebrates that possess gills, a cranium protecting the brain, and lack limbs with digits. They show a wide diversity of body plans (over 33,000 extant species), including jawless fish, cartilaginous fishes, and bony fishes; many have streamlined shapes adapted for movement in water. Cultural materials invoke recognizable species appearances (e.g., herring, salmon) in song and poetry.

Biologically, fish respire through gills, are mostly ectothermic (body temperature varies with surrounding water), exhibit diverse locomotory adaptations (paired fins, swim bladders in many species), and can use acoustic and other forms of communication in contexts such as courtship. Culturally, fish function as food sources, subjects of aquaculture and fisheries, motifs in religious art (e.g., loaves-and-fishes imagery), and characters or metaphors in song and literature. The sources do not attribute supernatural powers or volitional agency to fish as spirits.