👉 The term "capelin" is typically used in the context of marine mammals. However, it can also refer to a species of fish that are part of the family Carangidae. These fish have a unique adaptation called the pectoral fin (also known as a pectoral cartilage or pectoral plate), which allows them to move their bodies forward and backward in the water column. This is why they are often seen swimming backwards on land. Capelin can be found in