Cystoseira osmundacea

are eaten by

• Global Biotic Interactions: Haliotis corrugata W. Wood 1828
• Global Biotic Interactions: Pugettia producta (crabe des laminaires)
• Global Biotic Interactions: Norrisia norrisi (G. B. Sowerby II 1838)
• Global Biotic Interactions: Haliotis rufescens Swainson 1822
• Global Biotic Interactions: Haliotis kamtschatkana Jonas 1845
• Global Biotic Interactions: Haliotis fulgens Philippi 1845
• Global Biotic Interactions: Megathura crenulata (Sowerby I 1825)
• Global Biotic Interactions: Girella nigricans (Ayres 1860) (Calicagère bleue)
• Global Biotic Interactions: Medialuna californiensis (Steindachner 1876) (Calicagère demi-lune)
• Global Biotic Interactions: Lytechinus pictus (Verrill 1867)
• Global Biotic Interactions: Lytechinus pictus (Verrill 1867)
• Global Biotic Interactions: Strongylocentrotus purpuratus (Stimpson 1857) (oursin pourpre)
• Global Biotic Interactions: Mesocentrotus franciscanus (A. Agassiz 1863) (Oursin rouge géant)