Bile Knifefish

Bile Swimmer

Blind Pipe Boa

Brace Rat

Brood Rat

Canopy Moray

Coil Rat

Column Rat

Conduit Lamprey

Conduit Rat

Drain Eel

Drape Rat

Fetch Rat

Flux Serpent

Flux Vole

Gantry Mouse

Lacquer Eel

Lacuna Threadworm

Ledger Rat

Mesh Runner

Moult Rat

Overflow Serpent

Pack Shrew

Pack Vole

Pale Canal Rat

Pale Sump Rat

Razor Rat

Seam Runner

Seep Worm

Silt Moccasin

Slag Rat

Sump Boa

Sump Rat

Tangle Rat

Tunnel Krait

Vault Rat

Volt Lamprey

Witness Rat

Bile Knifefish

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creature urban_fauna adaptation aquatic drainage electroreception schooling aquarium_origin

rating	0
vote count	0
name	Bile Knifefish
aliases	knife ghost yellow current chemical eel
origin	adaptation
threat level	negligible
story hooks	A retention basin that has had a stable Bile Knifefish population for twenty years has suddenly gone empty — every fish departed overnight. The basin feeds into drinking water pre-treatment infrastructure for a Tier 2 district, and nobody in the utility authority wants to say what changed upstream. A researcher is documenting the frequency shift in Bile Knifefish electric organ discharge, claiming it's adapting to specific industrial emission signatures — essentially, different chemical pollutant environments are producing slightly different electric 'dialects' that can identify a fish's home drainage section. Someone very interested in what those sections contain has started following her work.