Hello Gobbledygookie, "Fishes" is uses to describe many diferent types of fish, in the biological sense. " Then, you should use fish . I can't imagine when "offsprings" is a correct noun, but perhaps someone will tell me.
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Actually, fishes should never be used. One should rewrite the sentence to read "a variety of fish species were on display" or "on display were many species of fish"
--Journalist
The word 'fishes' is seldom used except in technical discussions about different species.
offsprings is not a valid word.