What is the difference between caviar and the orange eggs on sushi?

Answer 1:

Caviar isn’t just black fish eggs, and slimy caviar is a severe quality issue. Caviar is a highly rare and expensive delicacy, made from the roe of Caspian, Black, and Azov Sea sturgeon that are rapidly vanishing. Which caviar is the greatest in the world?

Answer 2:

The eggs are tiny, measuring between 0.5 and 0.8 mm in diameter. Tobiko is larger than masago (capelin roe) but smaller than ikura (salmon roe) (salmon roe). Tobiko is a reddish-orange fish with a moderate smoky or salty flavor and a crisp texture.