I think this is why these cats are so attractive and why unknowning hobbyists buy these not so easy to keep fish
keeping a real shark at home is impossible,
but sharks are hugely popular on TV and elsewhere like doing diving trips
going scuba diving with sharks is not accessible for everyone, but the next best thing is setting up a living room tank and put in "shark like fish", which turn out to be mostly catfish.
it's not a surprise why so many common aquarium fish have common names with "shark" in there; the Balantiocheilus barbs (Tinfoil Barb, but "shark finned barb" in Dutch!), the large African Labeo's (like the Harlequin Shark), the Asian Epalzeorhynchus species (Red tail Black Shark etc)....
turning to sharklike catfish, fish like Pangasius sanitwongsei
, Pangasianodon hypophthalmus
, Ariopsis seemanni
, Ageneiosus magoi
, Synodontis granulosa
and the like sell like hot cakes.
some are common as dirt, some are very rare or cost an arm and a leg, but they all sell.
all of these have the undulating movement we see on TV when watching a shark themed show; almost all have a triangular dorsal and an overall general shaklike shape, some even have sharklike appetites...
unfortunately almost all of them have issues.
too big, too tricky with food, too fragile, horribly expensive, too salty.....