Mackerel roe refers to the eggs of the mackerel fish, a popular species found in oceans worldwide. These eggs are typically small, round, and have a translucent appearance. Mackerel roe is often harvested during the spawning season and is considered a delicacy in various cuisines. In culinary uses, mackerel roe can be enjoyed raw, pickled, or cooked. It is rich in nutrients, including omega-3 fatty acids, which are beneficial for heart health. Mackerel roe is commonly featured in dishes across Japanese and Mediterranean cuisines, adding flavor and texture to meals.