Clupeiformes is an order of fish that includes species commonly known as herring, sardines, and anchovies. These fish are typically characterized by their streamlined bodies, silver scales, and a diet primarily consisting of plankton. They are often found in both marine and freshwater environments and play a crucial role in the aquatic food web. Many Clupeiformes species are known for their schooling behavior, which helps them evade predators. They are also significant for commercial fishing, providing a vital source of protein for humans and serving as bait for larger fish. Their populations can be indicators of ocean health and ecosystem balance.