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It is the only fish that will graze on "black brush algae" (freshwater Rhodophyta, or red algae), but even so will eat anything else in preference.
This method of reproduction is found for example in conidial fungi and the red alga Polysiphonia, and involves sporogenesis without meiosis.
A similar interaction occurs between the red alga Chondrus crispus and the canopy-forming seaweed Fucus in intertidal sites of southern New England, USA.
It often grows in association with the crustose coralline alga Spongites yendoi and a filamentous red alga which it cultivates in a garden.