What are some kelp adaptations?

There are many different kinds of kelp, so there are some variations in their adaptations. Some of the commonly-seen kelp adaptations include reproducing by releasing spores instead of seeds, which appears to be more successful for kelp, and growing small air bladders along the stems so that the kelp is able to "stand" upright. Kelp also grows extremely fast, so even though many animals eat it, it is able to survive.