Barnacles are filter feeders, extending their long feeding appendages (cirri) to remove zooplankton and microalgae from the water column. During feeding, the paired scuta and terga open and six pairs of cirri unroll and extend through the aperture (Ruppert & Barnes 1994). Long setae, or hair-like projections, cover the cirri to form a basket-shaped netting apparatus which strokes through the water to collect plankton. Predators: Few predators are recorded for B. eburneus, but individuals are likely preyed upon by a variety of fishes and invertebrates.
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