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Fish mouth filters have complex design


People looking for easy-evolve simplicity missed this:

From Nature Communications:

Suspension-feeding fishes had been assumed to use dead-end mechanical sieving, in which fluid passes perpendicularly through the filter, whereas particles that are too large to exit through the pores are retained by sieving on the filter surface7. In contrast, crossflow filtration in suspension-feeding fish species has been shown recently to extract food particles without clogging or concentration polarization along the rows of comb-like, mesh-like or knobby gill rakers that form the filter surface on the branchial arches1, 7, 8, 9, 10 (Fig. 1a). However, the inertial lift forces employed in microfluidics devices are too low to account for the lack of contact between food particles and the gill-raker filter1, indicating that additional unidentified mechanisms are operating to prevent clogging during crossflow filtration in fishes. More. (public access paper)

Darwinism is magic. Keep repeating slowly, Darwinism is magic.

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