Lirceus fontinalis is a detritus feeder, sustaining itself on organic particulates in the water and algal mats. Predators include various species of stream-dwelling fishes, such as green sunfish (Lepomis cyanellus) and sculpins (Cottus species). Results of laboratory experiments have suggested that these isopods detect sunfish chemicals and use these cues to avoid the fish by hiding in vegetation, remaining motionless, or burying themselves in the substrate. Lirceus fontinalis also uses avoidance tactics when it detects changes in current caused by approaching swimming fishes.
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