Caviar may also refer to a type of fish egg; the size of caviar varies based on the species of fish. The majority of caviar I’ve seen is black. Tobiko is the roe of a flying fish. Sushi restaurants are the most popular place to find these.
The roe of the flying fish is known as tobiko, or “poor man’s caviar.” It’s a common sushi ingredient that’s frequently sprinkled on top of maki sushi rolls or eaten alone. The eggs are tiny, around the size of salmon roe or masago.