Barnacle (scientific name: Balanus), commonly known as "touch" and "horse tooth", is an arthropod, with a calcareous shell attached to the rocks by the sea, which often forms a dense community.

Barnacles are hermaphroditic, and most of them are cross-fertilized. In the process of reproduction, sperm is sent to other barnacles with flexible tubules to fertilize the eggs. The fertilized egg undergoes metamorphosis and develops from larva to barnacle adult. In tropical waters, such creatures can reproduce and attach all year round, and the species and quantity decrease with the increase of offshore distance. Barnacles attached to coastal docks, ship bottoms and submarine cables often cause great harm. For example, barnacles attached to the hull greatly reduce the speed of navigation.

Sea rainbow generally refers to mussels. Mytilus edulis, also known as Haihong, is a bivalve mollusk, which is cooked and processed into dried mussels. It has a dark brown shell and lives on rocks by the sea. Distributed in the Yellow Sea, Bohai Sea and East China Sea coast of China. Mussel shells are wedge-shaped, with tapered front ends and wide and round back ends. Generally, the shell is 6-8 cm long.