Your least favorite aquarium fish and why

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There are plenty of fish types that don't interest me enough to devote tank space to them...polypterus, rays, bettas, African rift cichlids are a few that leap to mind...but the fish that I find quite repulsive are the assorted short-bodies and other should-have-been-culled mutations, closely followed by hybrids.

Serious hobbyists are always looking for wild-caught fish of "pure" strains...not just pure species, but actual pure strains from particular collection points. And yet other keepers, often no less serious but with different priorities, are cross-breeding everything they can get their hands on, often just on a lark, creating all these weird mutts that are in such hot demand. This is definitely a "me" problem, unless of course these synthetic critters are then sold back into the hobby to unsuspecting hobbyists that think they are getting something that they are not.
 
but the fish that I find quite repulsive are the assorted short-bodies and other should-have-been-culled mutations, closely followed by hybrids.

Serious hobbyists are always looking for wild-caught fish of "pure" strains...not just pure species, but actual pure strains from particular collection points. And yet other keepers, often no less serious but with different priorities, are cross-breeding everything they can get their hands on, creating all these weird mutts that are in such hot demand. This is definitely a "me" problem, unless of course these synthetic critters are then sold back into the hobby to unsuspecting hobbyists that think they are getting something that they are not.

:iagree: Nothing is really achieved with this, save for poor genetics and suffering, deformed fish.
I don't know how I possibly forgot to mention them!
 
Cichlid hybrids and cichlids with no pedigree that could be a hybrid.

Common Plecos , bullhead catfish, channel catfish, red tail catfish i have found them to be the most annoying catfish ever people are always rehoming certain fish dumping it on someone else and the cycle continues over and over again. Pacus Oscars

Whats with the flowerhorns. KOKs are ugly

Honestly anything albino even platinum
 
Common Plecos , bullhead catfish, channel catfish, red tail catfish i have found them to be the most annoying catfish ever people are always rehoming certain fish dumping it on someone else and the cycle continues over and over again.

These don't make my list of least favorite fish, but the people you're talking about make my list of worst fishkeepers. I see what you mean.
 
Just joking lol. Only said it because you seem to love loaches.
Right you are! You could say I'm the holotype of Homo sapiens loachaholici (Thoene, 2006) :ROFL:

As a real answer, any short body or genetically defored fish that reduces QOL.

Just as with jjohnwm, I'm with you on that. Fish like this

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Would be better off not existing at all. As put nicely by finchdad (concerning blood parrots):

Blood parrot cichlids are usually sterile because of chromosal incompatibility, they have a difficult time eating because of mouth deformities, their vision is impaired because their irises are usually blown out, they can have buoyancy problems because of swim bladder deformities...all because somebody in PetSmart thinks they are cute. Meanwhile, hundreds of wild cichlids have gone extinct and hundreds more can't even generate the funding to be scientifically described. It is a waste of fishkeeping.
 
Arowanas..ugly faces and boring, like watching a pendulum ticking back and forth.
Dovii...porportions always look weird to me. Huge heads and not real appealing shape. Look dopey to me.
Piranahs I don't get at all. Another boring fish. Everything is 'chop chop'.
 
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