Decorator crab and sponge relationship help

A Little Help from a Friend: 5 Symbiotic Marine Animal Relationships - Deepblu MAG

decorator crab and sponge relationship help

While this is not exactly obligate mutualism, the decorator crab definitely survives longer and the sponges are able to feed more conveniently. Abstract. The association between sponges and the crab. Inachus aguiarii Brito Capello, was studied by analysing the relationships between sponge. The decorator crab and Sea Sponge- Commensalism. by Sam and Brendan. 3 years ago Bring your visual storytelling to the next level. Add text, web link.

decorator crab and sponge relationship help

How would it look like to have a crab decorating itself? Are you shrugging away in disbelief?

The decorator crab and Sea Sponge- Commensalism

Decorator crabs are distributed worldwide grouped under the family Majidae and Inachidae. The family Majidae includes crabs that have tear shaped eyes and typical decoration. The carapace or the body is covered with spines and knobs with hooked hairs on them.

The projecting hooked hairs aid as attachment sites for algae, sponges and hydroids.

Decorator Crabs: Fashionistas of the Sea

They are found in depths ranging from 2 meters to 15 meters in the sea. This species can grow to about 3 cm carapace length. The eyes and antennae are short for this crab. A typical sponge decorator crab can attach fragments of sponges to their body and some reports show even attachment of sea anemones along with sponges.

While decorator crabs move on top of a sponge colony, they camouflage perfectly and are totally concealed from predators.

decorator crab and sponge relationship help

Barnacles on a gray whale in Hare Eye Lagoon, Mexico. Ken-Ichi Ueda Barnacles and Whales Barnacles have worked out a good deal with whales, mainly humpbacks, reaping great rewards from attaching themselves to the belly or backs of the whales.

decorator crab and sponge relationship help

Barnacles are filter-feeders, relying on plankton that they filter through feather-like appendages that extend through holes in their shells. An added benefit is protection from predators, as only the most courageous of predators is likely to attack a whale.


For the most part, the whale remains unaffected—they can support the weight of thousands of barnacles at a time. Barnacles and whales are an example of a symbiotic relationship of commensalism.

decorator crab and sponge relationship help

A seeing-eye fish Photo Credit: Klaus Stiefel Pistol Shrimp and Gobies Although the tiny pistol shrimp is basically blind, it has enlisted the help of the bottom-dwelling goby to act as its eyes and ears. The pistol shrimp spends its days digging small burrows in the sandy seafloor searching for food.

decorator crab and sponge relationship help

By doing so, the pistol shrimp creates holes that are just the perfect size to provide a resting place and protective shelter for a goby. The pistol shrimp allows the goby access to the holes it digs—rent-free—as long as the goby completes one job in return: When a predatory fish approaches the goby flicks its tail several times, alerting the shrimp to the coming danger.

Symbiotic Relationship Between Crabs & Sponges by Keith Matthews on Prezi

Both the goby and shrimp retreat deep into the burrow to wait out the attack. A decorator crab shows its style in the latest fashion. The decorator crab snips off pieces of sponge and anemone to add to its shell, gaining a piece of camouflage in the case of a sea sponge or a handy weapon in the case of a poisonous anemone.

The sea sponge and anemone both continue to live on the back of the decorator crab and, like a barnacle, gain the benefit of being transported to different feeding areas. An oceanic whitetip shark and a group of pilot fish swimming at the Elphinstone Reef in the Red Sea, Egypt.