Seaweed
Seaweed or macroalgae refers to several species of macroscopic, multicellular, marine algae. The term includes some types of red, brown, and green macroalgae. Marine algae species such as kelps provide essential nursery habitat for fisheries and other marine species and thus protect food sources; ocean algae species from seaweeds to planktons play a vital role in carbon capture, producing up to 90 percent of the planet's oxygen. Understanding these roles provides guiding principles for conservation and sustainable use of seaweeds to take precedence over industrial exploitation. Mechanical dredging of kelp, for instance, destroys the resource and dependent fisheries. Certain species of seaweed are valuable for nutrition, biomedicine, bioremediation, and other uses.
Seaweed blenny
The seaweed blenny is a diurnal species and feeds mostly on algae. The diet also includes such invertebrates as polychaete worms, crustaceans and hydroids, which it picks off the substrate with its beak-like mouth. A male may have several females in his territory, all of which deposit their eggs in a shared nest. This is in a crevice in a rock, inside a sponge, in a mollusc shell or in a can or other piece of discarded human debris. The male guards the nest until the eggs hatch. The larvae are planktonic at first, settling on the seabed when about long.