Plasmodesmata-Plasmodesmata are small tubes that connect plant cells to each other, providing living bridges between cells. Plasma Membrane-All living cells have a plasma membrane that encloses their contents. In prokaryotes and plants, the membrane is the inner layer of protection surrounded by a rigid cell wall.
Great blue herons and other aquatic birds eat crayfish. This includes surface feeding birds such as gadfly petrels, frigatebirds, gulls and fulmars. Crayfish escape from their predators by using a tail flip response. This rapid flip of their tails allows them to speed through the water away from danger.
Crayfish are scavengers, and eat mostly vegetative matter, although they do need some protein in their diet as well. They will eat many commercial fish foods including sinking algae wafers, shrimp pellets, and many freeze dried or flake foods. It's a good idea to include a lot of fresh foods in their diet as well.