Seldom seen or heard but but always felt is the No-See-Um, also called Biting Midges. No-See-Ums resemble miniature, short-legged mosquitoes, and are usually less than 3 millimeters long. In the science community, they have the nickname “flying jaws”. Their larvae are mostly aquatic or breeding in the moist muddy environments of the mangroves. During certain months of the year, usually associated with tides wetting the muddy substrates, they can have concentrated large populations, but they usually only last a day or so.
Conventional insect screen with a 16 mesh size (left) will not exclude No-see-ums. Smaller sized openings such as the 30-mesh screen (at right) is needed to exclude no-see-ums