The name halfbeak derives from the fact that the lower jaw is long and
spear-like, and the upper jaw somewhat shorter, an arrangement that allows
these fish to easily feed on floating debris, especially fallen insects.
There is a distinctive black line running along the center of the upper jaw,
and a pale spot on the tip of the lower jaw
that seems to glow in the water, reminiscent of
a fluorescent, yellowish-green,
felt-tipped marker. This spot may be effective in attracting insects, their
main source of food.
List of Thai Animal Names.