Fish comes top of the water to get oxygen.
It is normal most every goldfish does it, don't worry.
Goldfish come to the top of the water to breathe air because they have a special organ called a labyrinth organ that allows them to take in oxygen from the surface.
It is either well trained or dead.
using their gills they obtain oxygen from the top of the water.
Goldfish may hang out at the top of the tank because they are trying to get more oxygen from the surface of the water. This behavior can indicate that the water in the tank may not have enough oxygen for them to breathe comfortably.
Because your goldfish is dead.
Yes. goldfish breathe water so if a goldfish is out of water it cant breathe so it will suffocate
change water
A goldfish can live in an opaque glass tank as long as you keep up with necessary water changes. Like a small outside garden pond goldfish are only viewed from the top.
I don't know if it is normal or not, but my sister had goldfish that would jump out of their tank when she would walk into the room. She would have to scoop them up and put them back in.
To prevent your goldfish from making bubbles at the top of the tank, ensure proper water quality by regularly cleaning the tank and maintaining appropriate water parameters. Additionally, provide adequate aeration and surface agitation to prevent bubbles from forming.
Goldfish can settle at any level in the water to rest/relax although they often do go to the bottom.