ANIMAL: Smooth Giant Clam/Southern Giant Clam/Derasa Clam Tridacna derasa Type of Animal: Cockle Habitat: Outer reefs/reef edges, intertidal coral areas, lagoons, coral outcrops, within Acropora corals, sandy flats, rubble piles, rock faces, found at depths of 1-65 ft Location(s): Indo-West Pacific, C Pacific, & S Pacific Appearance: Very large clam, smooth shell, lack of scutes (scale-like shell protrusions), colorful mantle has wavy stripe or spot pattern, large plain shell, 2nd largest of the giant clams Food/Diet: Make food for themselves in 4 ways-firstly, they have large amounts of symbiotic single-celled dinoflagellate algae (zooxanthellae) in tissues-due to these clams needing moderately lit to well-lit habitats, algae may make too much food for themselves giving extra carbon/glucose to clam. Secondly, zooxanthellae can be eaten by amoebid cells within host clam. Thirdly, they can absorb nutrients from water. Fourthly, they can act as filter-feeders, straining phytoplankton/zooplankton/detritus/algae w/ gills. Status in Wild: Threatened Conservation: Use in aquaculture reducing demand for wild-caught clams Lifestyle: Mostly in colonies of 15-30 clams, though sometimes solitary as well Additional Info: Called: Young: Trocophore Group: Colony/Aggregation/Bed Weight: 90-400 lbs Gestation: 12 hours Life Span: 30-70 years in captivity, 150-250 years in wild Length: Adult: 18-23 in Young: 4 in Main predators are parasitic/predatory snails, fish, sea snakes, sea stars, crabs, lobsters, shrimp, bristleworms, fireworms, octopus, burrowing sponges, clam worms, & anemones. Threatened due to aquarium trade, hunting for food, hunting for shells, medicinal use, habitat degradation/destruction, water pollution, & coastal development. They’re very slow growers after reaching maturity. Reproduction stimulated by lunar cycle, time of day, & presence of other eggs/sperm. They detach byssus (tuft of long tough filaments) as they mature. Most readily available giant clams in aquarium trade. Mantle colors result of crystalline pigment cells. Fun Fact(s): Start life as free-swimming larvae, then developing into new larval stage capable of filter-feeding. Develop feet at 3rd larval stage, allowing it to alternately swim/rest. Become juveniles at around 10 days old, when they acquire zooxanthellae, starting symbiotic relationship. Juveniles become males at 2-3 years old, eventually becoming hermaphroditic once they reach 12 in. Due to being hermaphrodites much of their life, sperm released 1st followed by eggs, avoiding self-fertilization.
Wonderful beat ! I would like to apprentice at the same time as you amend your web site, how can i subscribe for a
blog website? The account aided me a applicable deal. I have been a little bit familiar of
this your broadcast provided bright clear concept
When some one searches for his vital thing, so he/she desires
to be available that in detail, therefore that thing is maintained
Your method of telling everything in this piece of writing is really good, every one can without difficulty know it,
Thanks a lot.
Hi, constantly i used to check webpage posts here in the early hours
in the morning, as i love to find out more and more.
Highly descriptive post, I enjoyed that
bit. Will there be a part 2?