Spider Crabs at a Whale Fall in Monterey — Live Webcam Online

Whale Fall — An Island of Life in the Deep-Sea Desert

When a large whale dies and its body sinks to the ocean floor, something remarkable happens. The carcass becomes a source of enormous amounts of organic matter in an environment where food is scarce. This phenomenon is called a whale fall, and it creates an entire ecosystem on the ocean floor that can exist for decades. The camera at the Monterey Bay Aquarium allows viewers to observe a fragment of this process — spider crabs crawling among the bones of a whale skeleton on the sandy bottom.

Deep-sea ecosystems around whale falls are some of the most astonishing on the planet. In complete darkness, under immense pressure and temperatures near freezing, life teems around a single source of energy. Research shows that a whale fall ecosystem can exist from 4 to 4,100 years depending on the size of the whale, depth, and types of organisms. Some falls sustain decomposer ecosystems for up to 100 years.

Four Stages of a Whale Fall's Life

The whale fall ecosystem goes through 4 main stages, each characterized by its own inhabitants and processes. Understanding these stages helps grasp how complex and interconnected this underwater world is.

Mobile Scavenger Stage — the first phase, when whale flesh is consumed by large scavengers. Hagfish, sleeper sharks, and other predators literally devour the soft tissues within months. During this stage, the bulk of organic matter settles on the bottom.

Enrichment-Opportunist Stage — begins when the flesh is gone, but plenty of organic matter remains in the bones and sediment. This stage can last up to 2 years. This is when spider crabs and other crustaceans appear, feeding on organic remains trapped in bones and sediment.

Sulfophilic Stage — the longest and most unique phase. At this point, bacteria anaerobically break down lipids contained within the whale bones. This process releases hydrogen sulfide, which is used by chemosynthetic bacteria — the foundation of a food chain independent of sunlight.

Reef Stage — the final phase, when organic matter is almost entirely depleted, and the bones become a hard substrate for filter feeders, much like a coral reef in the deep sea.

Spider Crabs: Inhabitants of Underwater Forests

The spider crabs of the genus Pugettia visible on the camera are kelp crabs inhabiting the Pacific coast from Canada to Mexico. These crustaceans are omnivorous and play an important role in coastal ecosystems.

The northern kelp crab (Pugettia producta) has a distinctive feature: two rows of hooked bristles just above the rostrum (the front part of the shell). The crab attaches pieces of kelp and other algae to these bristles — this serves simultaneously as camouflage and food storage. This behavioral adaptation makes spider crabs some of the most recognizable inhabitants of kelp forests.

In the whale fall ecosystem, spider crabs act as omnivorous scavengers, participating in the decomposition of organic material on the ocean floor. Their presence at a whale fall is a natural part of the organic matter recycling process in the marine environment.

Monterey Bay Aquarium — A Window to the Deep Sea

The Monterey Bay Aquarium is located in Monterey, California, on the shore of the bay of the same name. This world-class institution specializes in marine biology and education. The spider crab camera at the whale fall is one of several live streams that the aquarium provides to viewers around the world.

Monterey Bay is unique in that the Monterey Canyon — one of the deepest submarine canyons on the west coast of North America — lies in close proximity to the shore. This is where actual whale falls occur, studied by scientists from MBARI (Monterey Bay Aquarium Research Institute).

Real Whale Falls in Monterey Canyon

Monterey Canyon is a natural laboratory for studying whale falls. A recent whale fall in Monterey Canyon lies at a depth of 2,891 meters. At this depth, the pressure is nearly 300 atmospheres, and the temperature is about 2°C.

MBARI researchers conduct experiments with artificial whale falls. One notable example — a whale carcass that scientists sank at a depth of 1,800 meters in Monterey Canyon. This fall was nicknamed "Patrick" and became the subject of long-term research on the formation of deep-sea ecosystems.

Who Else Lives at a Whale Fall

The whale fall ecosystem is incredibly diverse. Besides spider crabs, remarkable organisms inhabit the bones and surrounding area. Among them are bone worms (Osedax), polychaetes, grenadiers (deep-sea fish), octopuses, bacterial mats, hagfish, and sulfate-reducing bacteria.

Osedax worms, known as bone worms, are some of the most unusual inhabitants of whale falls. They bore into whale bones, which accelerates the sulfophilic stage and influences the entire habitat. These worms have no mouth or stomach — they rely on symbiotic bacteria that digest collagen and lipids from the bones.

One study found that total organic carbon content and proteolytic activity at a whale fall site persisted for 17–70 months, highlighting the long-term impact of a whale fall on the chemical composition of bottom sediments.

Why Whale Falls Matter for the Ocean

Whale falls serve a critical ecological function — they concentrate organic matter in places where it is usually extremely scarce. In the deep ocean, where sunlight cannot penetrate, photosynthesis is impossible. A whale fall becomes an "oasis" of life, supporting hundreds of species of organisms.

Furthermore, whale falls serve as "stepping stones" for the dispersal of deep-sea organisms. Between hydrothermal vents and cold seeps — other sources of chemosynthetic energy — whale falls create intermediate habitats, allowing species to migrate and colonize new territories.

Studying whale falls helps scientists understand how life can exist in extreme conditions — including possible analogs on other planets and moons where water may interact with rock in the absence of sunlight.

Spider Crab Behavior on Camera

Watching the spider crabs on the Monterey Aquarium camera, viewers can observe characteristic features of their behavior. These crustaceans move slowly, using their long legs to navigate the uneven surface of bones and sandy bottom. Their movements appear cautious and measured — typical behavior for crabs searching for food among the substrate.

Spider crabs use their claws to grasp organic particles and manipulate objects. In their natural habitat, they often decorate their shells with algae for camouflage — a behavior that evolved as a means of predator defense. Although such camouflage is less critical in aquarium conditions, crabs may display residual forms of this behavior.

What You Can See on the Camera

The Monterey Bay Aquarium underwater camera shows a spider crab on the sandy bottom among the bones of a whale skeleton. The image reveals a large spider crab with characteristically long legs crawling over the whale bones. In the background, large skeleton bones create a textured landscape on the flat sandy bottom.

The camera is positioned so viewers can observe spider crab behavior in real time. In the upper right corner of the image is the aquarium logo, and in the lower left — the inscription "LIVE Spider Crab Cam," confirming this is a live broadcast. The online camera allows viewers to see the anatomical details of spider crabs: their long jointed legs, rounded shell, and distinctive claws.

This webcam is a unique opportunity to observe an ecosystem similar to those that exist on the ocean floor in Monterey Canyon at a depth of nearly 3,000 meters. Unlike actual deep-sea whale falls, accessible only by research vessels, the Monterey Aquarium camera makes this amazing world available to anyone who wants to learn more about life in the deep sea.