Aquatic elf

Also called sea elves, these creatures are water-breathing cousins to land-dwelling elves. They live amid the waves and the ocean depths with allies such as dolphins and whales. Aquatic elves fight underwater with tridents, spears, and nets. Most aquatic elves revere Deep Sashelas, an undersea god of knowledge and beauty.

Aquatic Elf Traits (Ex): These traits are in addition to the moon elf traits, except where noted.
 * +2 Dexterity, -2 Intelligence. These adjustments replace the moon elf's ability score adjustments.
 * An aquatic elf has the aquatic subtype.
 * An aquatic elf has a swim speed of 40 feet.
 * Gills: Aquatic elves can survive out of water for 1 hour per point of Constituion (after that they start to suffocate).
 * Superior Low-Light Vision: Aquatic elves can see four times as far as human in starlight, moonlight, torchlight and similar conditions of low illumination. This replaces the moon elf's low-light vision.
 * Favored Class: Fighter. This trait replaces the moon elf's favored class.