Lamprey are the only species of fish that do not have a jaw, or fixed appendages, unlike other fish. They suck nutrients and organs from other organisms.
Lamprey eels are parasites so when they hook on to other animals they suck the animals blood. :P
If you mean like plectos, Cory cats, or something of that sort. No they wont eat the other fish unless the fish is the size of an egg and it can suck it up (this would be an accident the fish didn't do it on purpose) other than that no they don't. If the "cleaner fish" isn't a fish like that tell me and i will answer again
u suck
u suck
No idiot no fish have necks.You,re suck a frecking nemrod.
Because it makes you look like a fish! XD
suck it diptard
Simple, they don't. Bats only eat insects, fruit, small fish, or suck blood.
Yes they can eat vegitables, Plecostomus are Herbivores. Some people call them carnivores because they suck onto your fish. However this only happens if they are starving, They are not trying to eat your fish they are just trying to suck the algae off of them. This can kill the other fish because it also sucks the slime off of them.
All kinds of sharks and big fish.
you are not so smart you suck