The sighting is a big deal because the species had not been formally reported in the South China Sea before, and even basic facts about its life are still surprisingly hard to pin down.<\/p>\n\n\n\n When a whale dies offshore and sinks, the body can become a temporary hotspot for deep-sea life<\/a>. These \u201cwhale falls<\/a>\u201d can feed scavengers, bacteria, and even chemosynthetic communities<\/a> for years, sometimes far longer depending on conditions and how much material remains.<\/p>\n\n\n\n To mimic that sudden pulse of food, researchers deployed a processed cow carcass and a metal-framed camera cage on the continental slope, then watched what showed up. The setup was placed on November 3, 2022, and monitored through November 21, with the cow and camera cage positioned about 6.6 feet apart (2 meters) and checked using a remotely operated vehicle.<\/p>\n\n\n\n Pacific sleeper sharks are built for cold, dark water, and they often stay out of sight along deep continental shelves and slopes. A NOAA scientific review<\/a> notes that \u201clittle is known\u201d about even the most basic parts of their biology and ecology, even though they turn up as bycatch<\/a> in multiple commercial fisheries.<\/p>\n\n\n\n They also have a broader range than many people assume. That same review describes a North Pacific distribution stretching from places like Palau and Taiwan to Japan and Siberia, across the Bering Sea and Gulf of Alaska, and down the west coast of North America to Baja California, with additional low-latitude records in deep waters.<\/p>\n\n\n\n In this South China Sea deployment, the researchers differentiated eight individual sharks on camera and estimated lengths from about 6 to 17 feet (1.9 to 5.1 meters). They describe it as the first report of the species in the South China Sea and say the footage shows the sharks actively tearing at the carcass on the seabed<\/a>.<\/p>\n\n\n\n As for sex, there is an important caveat. The team could not confirm it without physical specimens, but they write that the individuals \u201cseem to be female\u201d based on pelvic-fin features visible in the video.<\/p>\n\n\n\n Instead of a chaotic feeding frenzy, the camera captured something closer to a dinner line. The sharks tended to take turns, with later arrivals approaching from behind and earlier feeders giving way, a pattern the authors describe as \u201cqueue-feeding\u201d or sequential feeding behavior.<\/p>\n\n\n\n The team also noticed a split in behavior based on size. Larger individuals, above about 8.9 feet long (2.7 meters), were bolder at the carcass, while smaller sharks often circled and waited for a safer opening.<\/p>\n\n\n\n It sounds almost civilized, right? There is likely a hard-nosed reason. In the deep sea, injuries can be costly, and meals can be rare enough that it may be smarter to avoid a direct fight, even if you are a top scavenger.<\/p>\n\n\n\n One of the strangest details in the footage was how the sharks handled their eyes while feeding. The report describes a noticeable eye retraction movement, which could help protect the eye during tearing, bumping, and close-contact feeding.<\/p>\n\n\n\n![\"Pacific](\"https:\/\/www.ecoticias.com\/en\/wp-content\/uploads\/2026\/05\/pacific-sleeper-shark-deep-sea-cow-carcass-experiment.jpg\" "\\"\\"")
A \u201cwhale fall\u201d idea, with a cow doing the stand-in<\/h2>\n\n\n\n
Eight sharks where no one expected them<\/h2>\n\n\n\n
What the cameras actually caught<\/h2>\n\n\n\n
A surprisingly orderly deep-sea dinner<\/h2>\n\n\n\n
Eye protection in a messy meal<\/h2>\n\n\n\n