Cod and Mentaiko are two completely different fish ingredients, they are not the same fish.
Cod is a common fish, belonging to the family Codidae, widely distributed in the North Atlantic and Arctic Oceans. This fish meat is usually used to make cod dried, cod oil and other various fish products, and has a long history of consumption in Europe and North America.
Pollack is a common ingredient in Japanese cuisine, mostly refers to caviar, usually made from cod or salmon roe. Pollack caviar is usually red in color and is often used to make sushi, rice balls and other Japanese dishes. Its taste is usually spicy and delicious.
Therefore, cod and pollack are two completely different ingredients, covering different types of fish and their products. Their differences lie in the type, edible use and preparation method.
