👉 A "holdfast" in the context of marine biology refers to a type of fish that is known for having a strong, durable and robust body structure. These fish have thick, flexible skin and are capable of swimming with great speed and agility. They are also able to withstand extreme conditions such as high temperatures or low oxygen levels. In terms of their habitat, holdfasts are typically found in freshwater environments where they can swim efficiently and navigate through the water. They are often found in coastal areas