Crassostrea gigas are filter-feeding, heterotrophic consumers. They are omnivores, feeding on bacteria, protozoa, various types of phytoplankton, larval forms of other invertebrates, detritus, and some inorganic material. The size of their food is usually between 2-10 µm (Pauley et al., 1988: 12).
When feeding, individuals secrete mucus to trap and sort food according to size. When larger food particles are encountered, more mucus is secreted. This occurs in the labial palps (thin, plate-like structures on either side of the mouth). The food is then either passed into the mouth or discharged. After taken through the mouth, it is sorted again by the caecum in the alimentary canal, and then digested (Pauley et al., 1988: 12).
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