Giant Clam

Can reach nearly 4ft in length!
Giant Clam Scientific Classification
Scientific name
Tridacna gigas
Giant Clam Physical Characteristics
Brown, Yellow, Red, Blue, Green, Orange, Pink
100-200kg (220-440lbs)
Giant Clam Distribition

” A giant clam can consider as much as 550 extra pounds!”

Giant clams expand to be around 4 feet in size. They reside in the Indian and South Pacific Oceans. The subjected mantle, or soft cells, of a giant clam, includes a mix of shades and patterns that can consist of yellow, eco-friendly, rainbowlike blue, and purple. This species of clam is an omnivore consuming small aquatic plants in addition to animals in the type of zooplankton. The life-span of this mollusk copulates as much as 100 years!

5 Unbelievably Giant Clam Truths!

  • After affixing itself to a reef, this mollusk remains there for the remainder of its life
  • The brilliant shades in this clam’s mantle are triggered by the algae in its system
  • There is a tale declaring that these clams are maneaters, however this is not real
  • Lots of clams of this species reside on the Great Obstacle Coral reef off the shore of Australia
  • This species has a conservation status of Vulnerable

Giant Clam Scientific Name

The scientific name of this clam is Tridacna gigas Words Tridacna originates from the Greek word tridaknos indicating oyster and the Latin word gigas suggests giant.

It comes from the Cardiidae family and the class Bivalvia. There are 100 species of this clam.

Giant Clam Appearance & Habits

These clams have a thick, hefty covering with fluted sides that shields the mantle, or soft cells, inside it. Its mantle is vivid showing patterns of brownish, rainbowlike blue, eco-friendly, yellow, and purple. The algae kept in this clam’s body is what makes its mantle so vivid. A grown-up clam’s mantle has light places on it called home windows. The dimension of these clams varies from 4 feet to 4.5 feet in size. They consider around 500 extra pounds. Photo 3 bowling pins aligned end to finish and you have the size of a 4- foot giant clam. A 500- extra pound giant clam is equivalent in weight to fifty percent of a horse. The heaviest giant clam on document is 550 extra pounds!

One more species of this sea animal is the southerly giant clam. Its scientific name is Tridacna derasa Though it has a similar appearance to the Tridacna gigas, the southerly giant clam procedures simply 2 feet in size.

The large dimension of a grown-up giant clam in addition to its thick covering works as superb security versus the majority ofpredators Moreover, this clam can shut its covering the majority of the means to secure itself from dangers. A grown-up clam isn’t able to break its covering shut. After the clam connects itself to a coral reef, it remains there for its whole life.

Blue color giant Tridacna clam underwater
Andrea Izzotti/

Giant Clam Environment

These clams reside in cozy water environments. Particularly, they are discovered in the South Pacific and Indian Oceans. They live off the north shore of Australia in addition to near the Nicobar Islands and Fiji. The Great Obstacle Coral Reef near Australia is house to a lot of these clams. They reside in coral reef apartments in addition to in superficial, sandy locations of shallows.

They are generally discovered at a deepness of around 65 feet. In a sea, a deepness of 65 feet is not really deep! Staying in superficial locations enables these clams accessibility to filteringed system sunshine.

Giant Clam Diet

These clams are omnivores. Nonetheless, because they are connected to a reef, they can not search for food. Fortunately, the food involves them! These mollusks have a siphoning system that absorbs small victim that drifts by. This siphoning system resembles the filtering system in a yard swimming pool.

What consumes giant clams?

It might look like the large dimension of this clam would certainly maintain all dangers away. However this mollusk does have some predators Coral reef fish, eels, and starfish eat the meat of the clam. Humans additionally gather these clams to eat their meat.

What do giant clams eat?

These clams feed upon both plants and animals specifically phytoplankton and zooplankton. These clams have a siphoning system that absorbs water together with small fragments of food that go by.

Likewise, the clam obtains nutrients consisting of sugar and healthy protein from the billions of fragments of algae kept in its cells. This is what is called an equally helpful connection. The algae delight in the security of living in the clam’s body cells while the clam gets necessary nutrients in return.

These clams open their covering throughout the daytime hrs to permit sunshine to filter in with the clear places, or home windows, in its mantle. Sunshine figures in in the photosynthesis that feeds the algae.

Giant Clam Predators and Dangers

Eel, coral reef fish, and starfish eat the meat of these clams. When among these predators takes a bite, it does not eliminate the giant clam. Nonetheless, it does trigger injury.

Humans are one more risk to this clam. Individuals gather these clams for their meat and coverings. Particularly, the adductor muscle mass of a giant clam is taken into consideration among one of the most tasty components of this sea animal. These clams are specifically preferred food in Japan, France, and throughout southeast Asia.

The larvae of these clams are consumed by fish, octopus, and crabs. These larvae are so tiny that hundreds of them can be consumed by one huge fish. This is the primary reason that a giant clam launches many eggs. It boosts the opportunities a few of them will certainly make it through to the adult years.

Water air pollution is one more risk to these clams. Air pollution can influence the price of reproduction of these sea animals.

The main conservation status of these clams is Vulnerable.

Giant Clam Reproduction, Children and Life Expectancy

Each giant clam has both sperm and eggs. They duplicate by launching both sperm and eggs right into the open water. One giant clam can launch 500 million eggs at once! Eggs are fed by the sperm launched by one more giant clam. This is called program spawning.

The fed eggs hatch out right into larvae. Giant clam larvae flow in the water trying to find plankton and various other small fragments of food up until they expand huge sufficient to work out right into one area near or on a reef.

An establishing giant clam experiences numerous phases. It starts as an egg and hatches right into larvae. Afterwards, it turns into a veliger, a pediveliger, an adolescent, and a grownup. Though it takes years for a giant clam to attain grown-up weight and dimension it has a life-span of as much as 100 years. So, it has lots of time to become a 4- foot, 500- extra pound expanded- up!

Giant Clam Population

According to the IUCN Red Checklist of Intimidated Species, the population of these clams is detailed as undefined. It’s intimidated by humans that gather it for its meat and covering. Water air pollution is one more risk to this aquatic animal.

The conservation status of this clam is Vulnerable.


  1. Wikipedia, Available here:
  2. NOAA Fisheries, Available here:
  3. Seattle Acquarium, Available here:

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