This is a fugu, a blowfish.
And, this is many pieces of sliced blowfish. People eat them, dipped in soy sauce with a kind of citrus, sudachi, juice, chopped raw Welsh onion, grated Japanese radish and a little powdered hot pepper.
This is fried fugu. This fish goes with Japanese sake!
Rice porridge, flavored with soup stock made with boiled fugu, is also yummy.
By the way, the liver and ovary of a blowfish contain deadly-poison, killing ten people. Eating fugu is very thrilling, like Russian roulette. (Oh, just kidding:-) Fugus have much poison but eating them is very safety because trained chefs cook them.)