a type of small tuna (= a large fish that lives in warm seas)

Fish caught in warm waters include bonito, sharks, and turtles. 温暖水域的捕捞物包括鲣鱼、鲨鱼和海龟。

the flesh of this fish eaten as food, often used dried in Japanese cooking

Dashi is a mixture of dried bonito and dried seaweed. 出汁是用干鲣鱼和干海藻制成的。

It's a sort of pancake and they top it with shaved bonito flakes. 这是一种薄饼，上面盖着一层削得极薄的鲣鱼片。