Fish pickle is a type of preserved food made by marinating fish in a mixture of spices, oils, vinegar, or other acidic ingredients. The fish is typically cut into pieces and then combined with ingredients such as salt, chili, turmeric, garlic, mustard, or curry leaves, depending on regional preferences. The acidic environment helps to preserve the fish while the spices enhance its flavor.

Fish pickle is a popular dish in many coastal and South Asian cuisines, especially in India, Sri Lanka, and Bangladesh. The preservation process allows the fish to be stored for longer periods without refrigeration, making it a convenient and flavorful accompaniment to rice, bread, or other staple foods. Depending on the region, fish pickle can vary in taste from tangy and spicy to sweet and savory.

It's often served as a condiment or side dish with meals, adding a bold, intense flavor that complements the main dishes.