D20x5 Exquisite Eels

Beat you to it Aqualung.

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Tables:

These eels {appearance}.
These eels live {environment}, where they've evolved {niche}.
Among people, these eels {culture}.
The meat of these eels is {meat}.

appearance
are {colour -u} with {colour -u} stripes
are {colour -u} with {colour -u} dots
are {colour -u} with a {colour -u} head
are {colour -u} with a {colour -u} belly
are covered in {scaletype} scales
are remarkably similar in appearance to crazy straws
are {colour -u} yet covered in {colour -u} slime
have spiny sails along their backs and bellies
have eye-covering "helms" of clear cartilaginous flesh
have long pharyngeal jaws they stick out to "taste" the water
have a spike on the end of their tail
have bright flaps on their chins believed to be used for mating displays
are {colour -u} with {colour -u} rings
have bioluminescent patches of uncertain purpose
have regenerating lures growing off their face that mimic other animals
have the inexplicable tendency to fill up with gas and float to the surface as they age
some neotenous features kept from their leptocephalus stage
have oddly flattened bodies
have uncannily human-like eyes
have comically-oversized heads

colour
red
blue
yellow
green
orange
purple
brown
black
white
translucent
metallic
grey

scaletype
rough, tooth-like
long, fur-like
flared, feather-like
rounded
triangular

environment
in kelp forests
in coral reefs
in the lightless abyss of the ocean's depths
in brackish estuaries
in the streets and pipes of cities abandoned to rising sea levels
among the roots of mangrove swamps
in cold northern bogs
in rainforest streams and pools
in abnormally-salty seas
in seagrass meadows
in bayous
around hydrothermal vents
along rocky shores
in saltmarshes
in lagoons encircled by atolls
in arctic waters, near the undersides of ice sheets and icebergs
in fast-moving rivers
out in the open ocean
in flooded cave systems and cenotes
in freshwater lakes

niche
into a colonial organism similar to siphonophores, with tiny venomous sub-eels filling the role of nematocysts
to parasitically inhabit the digestive systems of other animals
to root in place and use their highly-derived lips to filter-feed
into ambush predators that spring from dens of mucus and sediment
into a gargantuan apex predator
into docile herbi- and detritivores
into an ectoparasite similar to leeches and lampreys
into carrion-scavengers and opportunistic predators
to dig up, pry off, and crush shellfish
into eusocial organisms that farm marine fungi
excellent camouflage that lets them creep right up to prey
or rather been selectively bred to be the preferred livestock of sapient cephalopods
potent and dextrous electronic organs that allow them to galvanically puppeteer the corpses of other organisms
to obtain energy from eldritch beings by contorting themselves into the beings' writhesome sigils
to symbiotically eat parasites off other animals
psychic powers, using them to telepathically detect prey and lull them into sluggish complacency
to synthesize energy and nutrients from oil spills and microplastics
to feed manta-like on plankton
to fuse part of their skeleton into a shell, filling a niche somewhere between turtles and nautiluses
into dolphin-like intelligent pack hunters

culture
are a prized delicacy
are viewed with hatred and dread due to a devastating zoonotic disease that crossed over from them
are the face of the newest campaign against climate change
have captured the public imagination, and are now common motifs in art
are the subject of a society-wide experience of the Mandela Effect - nobody can remember them existing yesterday, but today they're in textbooks and the wild and on wikipedia
are revered by an obscure neo-pagan cult
are believed to be a hoax invented by an early 20th-century crank, propagated to drive tourism revenue
have recently made the news for being smuggled by a flamboyant criminal operation
are near-cryptids, attributed with extraordinary abilities and behaviours like swimming up rain into clouds
are a naturally-occuring basilisk hack - an image which causes paralysis and memory loss in people who see them. High-definition photos and videos of these eels are extremely illegal
have been taken as the symbol of an international ecoterrorist organization
were believed to be extinct until recently
are being studied for a potential cure for diabetes
are taken by many to be a fanciful and pathetic fabrication by their perceived political opponents
are being used as a bizarre speculative asset by desperate investors
are the big new drug due to the narcotic effect of their cerebrospinal fluid
are a new and exciting discovery in the zoological community
are the protagonists of the latest Pixar movie, in anthropomorphized and animated form
are believed to be genetically-modified creatures that escaped into the wild because of {escapereason}
are fad pets

escapereason
negligence
scientific malice
Russian interference
animal rights activism gone wrong

meat
{texture} and {flavour}

texture
tough
chewy
smooth
soft
rubbery
flaky
full of little bones
dry
moist
stringy
tender
juicy
hearty
silky
sticky
firm
spongy
crunchy
delicate
creamy

flavour
oily
salty
very umami
slightly sour
acidic
kind of bitter
hard to put your finger on flavour-wise
tangy
acrid
sulphurous
gamy
best paired with rice wine
treacly
vinegary
mellow
pungent
strangely sweet
spicy
earthy
fruity