The morphological structure of the radula allows H. discus hannai to
graze the blades of L. japonica more effectively than the filamentous
seaweeds G. lemaneiformis and S. pallidum (Kawamura et al., 2001;
Nie and Yan, 1985). The low feed intake of S. pallidum may be caused
by the toughness of the stipe. During the experiment, only the tender
leaves were eaten, while the stipes were discarded. The poor growth
of abalone fed S. pallidum was caused primarily by their lower feed
intake