You can find goldfish in most pet stores and department stores.
There are many different kinds such as angelfish, goldfish, alge eaters, eels, mini sharks and more but all pet shops are different. Just go to a petshop and you can see what they have.
Cross-breeding can produce nice fry, but in many cases unless you are a breeder, the majority of the fry may not survive due to the amount of cross-breeding that has occurred already to get many of the breeds we see these days.
Aslong as it has enough room and filtration many types of goldfish can be kept together. There are some cases where problems occur as such as the case with Sarassas and Orandas. Sarassas will tend to nibble at the cap of the Oranda causing damage.
They don't exactly have a goldfish room but they might have an aquarium with many different sea creatures.
There are about 30 different kinds
Because there were many different kinds of wealthy people.
Yes, there are many different kinds of billing software. Many different kinds are used even within the same industry.
There are many different kinds of seats in the world. There are millions of different kinds of seats in the world.
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Many different kinds means lets say an apple and a orange are not the same but it is DIFFERENT
It is quite possible that the black spot is part of the fishes colouration. Goldfish often have many different colours in many different shapes and shades anywhere on their bodies or fins.