PORT ARLEN, Oregon — A coastal marine center has limited viewing around its giant Pacific octopus after the animal began displaying skin patterns that visitors said resembled their scars, birthmarks and other marks, including some covered by clothing. The center remains open, but public feeding demonstrations have been postponed.
The adult female octopus has lived at the Port Arlen Marine Center since February in a 3,000-gallon cold-water habitat. Staff call her Alder for recordkeeping. She eats crab and clam, opens puzzle feeders and usually changes color or texture in response to light, food and movement near the glass.
Aquarist Mel Oren first noticed a pale curved line above Alder's left eye during a school visit Wednesday. A chaperone standing nearby had a similar surgical scar along her jaw. When the group moved to another gallery, the line faded. It reappeared lower on the animal when a second visitor approached with a burn mark on his forearm.
Staff initially treated the resemblance as coincidence. Octopuses control thousands of pigment cells and can raise small structures in their skin, producing irregular lines, spots and ridges. Over the next two days, however, visitors identified 14 patterns, including a three-point birthmark, a graft patch and paired knee scars hidden beneath trousers.
The center did not ask visitors to uncover marks or provide medical information. People who volunteered a comparison were offered a private written form, and photographs were taken only with consent. Director Ina Kells said images will not be used in advertising or posted online because a skin feature can be identifying even without a face.
Alder's appetite, respiration and den use remain normal. Veterinarian Corin Moss examined the habitat and reviewed video without sedating the animal. She found no lesions or discoloration that persisted between visitors. Water chemistry, temperature and copper levels were within the center's usual range.
Cephalopods use rapid skin changes for camouflage, warning and communication, said Linn Barre, a comparative biologist at a regional university. They also attend closely to human movement and may distinguish familiar keepers. Barre said an octopus could respond to posture or gesture, but matching a covered mark would require information not visibly available at the glass.
The center now admits six people at a time to the gallery and keeps a staff member nearby. Visitors may skip the exhibit without changing their ticket, and school groups use a live camera showing the full habitat rather than gathering at the window. The smaller groups have reduced crowding and made it easier to record when a pattern begins and ends.
Reactions have varied. One visitor left immediately after Alder formed a dark oval over the same ribs where she had a biopsy. Another, Lena Ward, brought her 9-year-old son back for a second viewing after the animal displayed a pale line similar to the port scar beneath his collarbone. Ward said her son regarded the resemblance as attention rather than exposure.
During the return visit, the boy stood quietly several feet from the glass. Alder moved from her den, settled against a rock and formed the line along one arm. She then curled another arm over the mark, a posture staff had not associated with feeding or defense. The pattern remained after the family left and faded when the gallery lights dimmed.
Kells said normal viewing will resume when staff can manage the exhibit without collecting personal comparisons from visitors. At closing Sunday, Alder again formed the pale line while the gallery was empty. She held it for 23 minutes and kept the marked arm beneath another, exposing only its tip to the room. When the night aquarist entered, the animal pulled both arms into the den but left one sucker pressed flat against the glass where the line had been.