When the long floating seaweed is gone from near tidal shores, that means the Otter is no longer in the area. Just like the forests, the seaweed always provided habitat for fish and the animals that rely on them. The otter kept sea urchins and animals in check.
Just like the forests, the seaweed makes home for its creatures, that feed in the cycle of life in these habitat areas. All the fish and animals migrate to their place of birth where habitats provided food for the next generation of life. Each species of animals having their own behavior and spirit that guides them to their destination.