National Geographic : 1956 Jun
irt © National Geographic Society 860 The Atlantic Sailfish Begins Its Career as a Grotesque and Awkward-looking Larva... Tiny, semitransparent larvae three and five days old (top left) show enlarged in the inset boxes. The smaller specimen, about t% inch long, lacks sail and bill but exhibits teeth and spines. Bill shows at five days; sail appears at 10 days, and its peak gradually moves aft. If the 3-year-old, weighing 80 pounds, were in scale, it would extend 8 feet.