Masses of tiny red crustaceans known as tuna crabs have washed up for a second straight year along stretches of the Southern California coast in a phenomenon marine scientists say is linked to a rise in ocean temperatures. Waves of the dead or dying tuna crabs have been found carpeting the shoreline at various Orange County spots, including Huntington Beach and Newport Beach south of Los Angeles, since the middle of last week. Also known as pelagic red crabs, the bright salmon-colored creatures resemble small lobsters or crayfish, measuring 1 to 3 inches (2.5-7.6 cm) in length. Unlike most crabs, they largely spend their lives grazing on phytoplankton as they swim freely in open water rather than crawling along the sea floor, though larger adults will make excursions to the bottom, according to Scripps Institution of Oceanography at UC San Diego. Because they live in the water column, the crabs drift with the winds, tides and currents.