The family Clupeidae includes small to medium-sized fish commonly known as herring and sardines. These fish are often found in large schools in both saltwater and freshwater environments. They play a crucial role in marine ecosystems, serving as a primary food source for larger predators like tuna and seabirds. Clupeidae species are also important for human consumption, as they are rich in omega-3 fatty acids and are often canned or processed. In many cultures, these fish are a staple food, contributing to both nutrition and local economies. Their abundance and schooling behavior make them a fascinating subject for both scientists and fishermen alike.