Commonly known as "Whale Catfishes"
because of the origin of the first name
Cetopis, meaning "looks like a whale".
Three pairs of barbels (no nasals); no adipose
fin; swim bladder highly reduced and enclosed
in bony capsule; dorsal fin far forward; anal
fin with 20-29 rays. Five genera, Cetopsis,
Cetopsidium, Denticetopsis, Helegenes
and Paracetopsis.
There are 43 described species (2025) in this
family and they are not too popular in the hobby
due to their inactivity in the aquarium. One
member of this genus the "Candiru"
is a voracious predator on other wounded fish
in its habitat, burying into the flesh
of the animal.
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