Can a amphioxus swim as well as an aquarium fish?
Amphioxus, a type of cephalochordate, is not as adept at swimming as many aquarium fish. While they can move through water using a simple lateral undulation, their swimming capability is limited compared to the more advanced muscle structures and streamlined bodies of fish. Fish possess fins and a more efficient propulsion mechanism, allowing for greater agility and speed in the water. Thus, aquarium fish generally outperform amphioxus in swimming ability.