Several scaleless fish with fanged jaws and huge eyes that can be found more than a mile deep in the ocean have washed up along a roughly 200-mile (322-kilometer) stretch of Oregon coastline, and it’s unclear why, scientists and experts said.

Within the last few weeks, several lancetfish have appeared on beaches from Nehalem, in northern Oregon, to Bandon, which is about 100 miles (161 kilometers) from the California border, Oregon State Parks said on Facebook. The agency asked beachgoers who see the fish to take photos and post them online, tagging the agency and the NOAA Fisheries West Coast region.

Lancetfish live mainly in tropical and subtropical waters but travel as far north as areas like Alaska’s Bering Sea to feed. Their slinky bodies include a “sail-like” fin, and their flesh is gelatinous — not generally something humans wish to eat, according to NOAA Fisheries.

Ben Frable, a fish scientist who manages the Marine Vertebrate Collection at Scripps Institution of Oceanography at the University of California San Diego, said it’s not uncommon for lancetfish to wash up on beaches, particularly in California and Oregon and in other parts of the north Pacific.

It’s unclear what might be behind the deep-sea fish washing ashore, Frable said, calling it an area of “open research.” He added that it’s not clear if these incidents are happening more frequently or are just noticed more often in the social media age.