Final answer:
Spicy tuna or salmon is usually marinated in Sriracha and mayonnaise, which gives a creamy and spicy flavor that is popular in sushi dishes.
Step-by-step explanation:
The spicy tuna or salmon is typically marinated in a mixture of Sriracha and mayonnaise. This combination provides a creamy texture with a spicy kick that complements the flesh of the fish. While other options like soy sauce and chili paste, sesame oil and ginger, or wasabi and lime juice are also used in various dishes, Sriracha and mayonnaise are specifically known for creating the spicy mayo often associated with spicy tuna or salmon rolls in sushi cuisine.