Although there are likely no studies on this, from my personal experience the noise doesn't appear to bother them at all. Since the pump is outside the tank, anything they might hear is probably quite muffled.
No, goldfish do not make noise.
By making noise
It means that they are breathing
it died
make the loadest noise you can make to disturb them
The past simple form of "disturb" is "disturbed." For example, "The loud noise disturbed my concentration."
The corresponding noun to the verb 'to disturb' is 'disturbance', and the gerund, 'disturbing'.
if the noise is a high pitched squealing noise, the belt is slipping....if the noise is a whine or growling noise, the pump is low on fluid or the pump is bad
Excessive noise has an effect on every living thing. (Even plants will grow leaning away from speakers producing loud heavy metal) I guess like most creatures, goldfish will be damaged by too much noise. I do know that tapping on the glass of an aquarium sends shock waves through the water that can damage fish. So I would guess the answer is "Yes noise is bound to affect goldfish".
no that's ridiculous
Goldfish can survive in a pond without a pump, but it is important to ensure that the pond has enough oxygen and is properly maintained to support their health and well-being.
Sounds like you need a water pump, The bearings in the water pump are making the noise not the pulley.