"Why, of course, young man. Here you go."
Blond vs. blonde
Wrong: He’s a tall, good-looking blonde.
Right: He’s a tall, good-looking blond.
A blonde-haired woman is a blonde, while a blond-haired man is a blond. (Some grammarians suggest that blond should be used for both genders, but blonde is still most often used for women.)
Fish vs. fishes
Right: There are many fish in the sea.
Right: There are many kinds of fish in the sea.
Right: There are many fishes in the sea.
While fish (plural) can refer to multiple piscine creatures, fishes specifically means multiple species of fish. A fishing boat may catch tons of the same kind of fish, while a marine biologist may collect a number of different fishes.
Please come back when you're hungry for more (words, not fish).