It is both. The plural form is the same as the singular. This is generally true of the word 'fish' on its own or used as a suffix. I don't think 'fishes' as a plural is incorrect, but it isn't commonly used.
The plural of goldfish is goldfish. It is the same as the singular.
Goldfishes There is no plural for goldfish. Goldfish itself is plural. Example: Hey Bob, can I see that goldfish you caught? Example2: Hey Bob, can I see those goldfish you caught?
The goldfish's
The plural form of the noun dog is dogs.The plural possessive form is dogs'.Example: All of the dogs' collars have a tag imprinted with their name.
Bridges is the plural form of bridge.
"Beliefs" does not have a plural form, as it is already plural. Beliefs is the plural form of belief.
There is no plural form for the word, countries. This word itself is a plural.
"Groceries" is the plural form of "grocery."
The plural form of "meter" is "meters."
10 / 15 = 66.7 % 66.7% of 15 goldfish is 10 goldfish
The plural form for the noun sergeant is sergeants; the plural possessive form is sergeants'.