- They are small, oily fish (often herring or similar species) that are typically, though not exclusively, packed in oil, brine, or tomato sauce, making them a convenient and shelf-stable food option.- They are known as a nutrient-dense "superfood," being a rich source of protein, Omega-3 fatty acids, vitamin D, and calcium.-They are commonly used in various meals, including stew, jollof rice, yam, pasta, salads, and as a sandwich filler.