It's just one of those funny irregularities in English Many words, such as deer, moose, and sheep, are spelled and pronounced the same way in both their singular and plural forms. Other interesting words with this property are congeries, kudos, premises, shrimp, bison, shambles, series, and species. Fish can be both singular and plural, yet fishes is also a correct pluralization of the word.
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Vincent TeoHow do I explain the reason, why do we say, "fish" instead of "fishes"Use 'fishes' if you want to emphasize different types of fish; otherwise, use 'fish'.
Eg: There are many fish in the aquarium.