Kelp are large seaweeds (algae) belonging to the brown algae (class Phaeophyceae) and are classified as the order Laminariales. There are about 300 different genera. Some species can be very long and form kelp forests.

Kelp fisheries is a branch of fisheries science which deals with the study of and uses of large seaweeds of the brown algae group that are commonly called kelp.

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