Your letters and comments on the July 8, 2017 & July 22, 2017, issue of Science News
Suck it up
Tubelip wrasses’ slimy lips help the fish suck up dinner from coral reefs, Helen Thompson reported in “The better to eat you with, my dear” (SN: 7/8/17 & 7/22/17, p. 44).
“How do wrasses ‘suck’ if they have no lungs?” asked reader John Coventry.
Suction-feeding fish let their mouths do all the work, says marine biologist David Bellwood. “In just the same way that we suck a milk shake, it is decreasing pressure of our tongue and throat that moves the fluid. Fish do not have tongues, but they do have very powerful muscles,” he says. Suction feeders create low pressure zones