Every Day Is Halloween For This Very Strange Fish

A Whitemargin Stargazer in Komodo National Park, IndonesiaReinhard Dirscherl/ Ullstein bild/Getty Get your news from a source that’s not owned and controlled by oligarchs. Sign up for the free Mother Jones Daily. This story was originally published by bioGraphic and is reproduced here as part of the Climate Desk collaboration. An orange glow appears in the darkness. It’s dim at first, then grows brighter as a group of children dressed as mermaids, bumblebees, and superheroes moves closer. Eventually, the children can make out a face, then a head, illuminated from within, perched on a neighbor’s doorstep. Like its centuries-old predecessors, the carved pumpkin is a lantern, meant to draw attention to itself and guide a path through the darkness. In contrast, the whitemargin stargazer (Uranoscopus sulphureus), despite its striking resemblance to the iconic Halloween symbol, takes a different approach. One of about 50 species in the stargazer family (Uranoscopidae), the fish’s primary life strategy is to go unnoticed by both would-be predators and unwitting prey: to disappear into sandy, often shallow ocean bottoms and wait for the next life-or-death moment. But disappearing in an environment with very little structure—nothing but sand or mud and the occasional tuft of seaweed—is no mean feat. Burial is really the only option, and for this, the stargazer is well suited. The fish’s large pectoral fins help it burrow into the ocean floor in mere seconds, and the venomous spines just above those fins deter predator attacks from above. The fringes, or cirri, around the stargazer’s mouth, which look a bit like a jack-o’-lantern’s crooked teeth, also keep sand out while the fish burrows. And unlike most fish, the stargazer’s eyes, nostrils, and mouth are positioned near the top of its head, which allows the fish to see, breathe, and be ready to snatch prey while the rest of its body remains out of sight. This unique morphology lends the fish its common—and rather poetic—name, because it’s nearly always looking up toward the night sky. The stargazer’s ghoulish appearance, hidden watchfulness, and venomous spines are enough to send shivers through those who have seen the fish in the tropical waters of the Pacific and Indian Oceans, where it lives at depths ranging from just a couple of meters to many hundreds of meters below the surface. It has been described as a “nightmare,” and that’s from the perspective of a human, who has nothing to fear unless they should step on one. For a cardinalfish or porcelain crab, however, the stakes are much higher. One moment, you might be cruising over the seafloor looking for a bite of food. In the next, you cease to exist.