The size of a goldfishes brain would depend upon the size of the goldfish. It is however quite large enough to enable the goldfish to survive. By comparison to mammals though it is small.
Goldfish do not get pregnant. They are egg layers.
no
contrary to popular belief, most goldfish do not have a stomach!
Fairly intelligent. Well they can count to five!
Well my goldfish cost 75 ponds some other goldfish cost 67 pounds it matters how big they are
A telescope eye goldfish is in the fancy goldfish type, and most fancy golddfish get up to a foot long (with proper care).
Yes a lot bigger.
RAINBOWS............ That is all
A telescope eye goldfish is in the fancy goldfish type, and most fancy golddfish get up to a foot long (with proper care).
Not really big but at least 30cms
No
Yes, big goldfish may eat smaller goldfish, as they are known to be opportunistic feeders and may consume smaller fish if given the chance. It is important to provide adequate space and appropriate tank mates to prevent any potential aggression or predation.