The kelp at San Clemente was much thicker than it is near the more northerly Channnel Islands closer to Santa Barbara. The stems were so closely spaced that a diver could not make his way between them without frequently catching a fin buckle on a stem. The kelp canopy covers the underwater sky in both places, but up north the holdfasts are huge, and from each comes a canopy for a large area. The canopies of the San Clemente kelp must be smaller.