The common goldfish because its fins are not too delicate
goldfish. Definatly goldfish. Or betta
fresh water
Goldfish do not have vocal chords and as such, this is not something that they can learn
Mythbusters did it with limited success
A goldfish is a type of fish.
2-3 months
Goldfish do not have legs. Goldfish do have fins, although the number of fins will depend on the type of goldfish.
Goldfish do not have hair; instead, they have scales that cover their bodies which can vary in type and colour depending on which type of goldfish you have.
No, goldfish are best with goldfish. In addition, tilapia have different needs and are quite likely to be aggressive towards the goldfish.
usually not but it depends on the type of goldfish
In late spring of early summer is the best time to breed goldfish.
The best and only good tank mate for fancy goldfish, are other fancy goldfish.