The red algae are nonmotile, which means they do not move on their own. Found all over the world in mostly marine but also freshwater habitats, red algae depend upon the movement of the water in which they dwell.Continue Reading
Red algae, also known as rhodophyta, which means "red plant", have from 5,000 to 10,000 species, some of which are seaweeds. They derive their red color from a number of pigments, the most important of which is phycoerythrin. They obtain their energy through photosynthesis. Because the red pigmentation is able to absorb blue light waves, they can survive deeper in the ocean than other forms of algae. Some red algae, called coralline algae, contribute to the formation of coral reef structures by secreting calcium carbonate. Red algae reproduce sexually. Water currents carry male gametes to female sex organs, called carpogonium, where they become attached.
Red algae are consumed not only by fish, crustaceans and other marine animals, but also by humans. They are rich in vitamins and protein and easy to cultivate. The Japanese call them nori and use them to wrap sushi. In Britain they are known as laver and are eaten cold as a salad, baked into bread, fried or mixed with oatmeal. Red algae called Irish Moss are used in puddings, ice cream, preserves, and even beer and wine.Learn more about Marine Life
Cnidarians that move do so by flexing weak, gelatinous muscles in the body walls of their bells against a pressurized hydrostatic skeleton. However, many types of cnidarians, such as mature anemones and corals, move little if at all, although juvenile stages may take a more mobile form to disperse individual organisms. Even the more mobile types, such as jellyfish, move only weakly and generally drift as plankton with the current.Full Answer >
Mollusks that live on land move quite slowly on a foot, while mollusks that live in the water send water out of their bodies to propel themselves. Most mollusks have a softer organ protected by a hard shell or are simply immobile.Full Answer >
Crayfish move underwater by fluttering small appendages, called swimmerets; but, they can also use their legs to walk on land or on the floor of various bodies of water. Swimmerets are located underneath the tail and can be used to clutch eggs.Full Answer >
Sea cucumbers eat algae, waste and small invertebrates on the sea floor. The animals eat with the same tube-like feet that they use for movement.Full Answer >