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Mantle of giant clam with light-sensitive spots, which detect danger and cause the clam to close. Tridacna gigas, the giant clam, is the best-known species of the giant clam genus Tridacna. Giant clams are the largest living bivalve mollusks. Several other species of "giant clam" in the genus Tridacna are often misidentified as Tridacna gigas.
The Registry of World Record Size Shells is a conchological work listing the largest (and in some cases smallest) verified shell specimens of various marine molluscan taxa.A successor to the earlier World Size Records of Robert J. L. Wagner and R. Tucker Abbott, it has been published on a semi-regular basis since 1997, changing ownership and publisher a number of times.
Harvesters should check current public health recommendations by marine authorities before collecting razor clams. In the United States, razor clam harvesting is typically authorized by state officials several times a year. [7] Harvesters locate the clam by looking for a "show," which can present as either a hole or depression in the sand. [8]
Sinonovacula constricta, the constricted tagelus, Chinese razor clam or Agemaki clam, is a commercially important species of bivalve native to the estuaries and mudflats of China and Japan. It is extensively aquafarmed in China and other countries, with 742,084 tons worth US$667,876,000 harvested in 2008.
By day, the clams spread out their mantle so that the algae receive the sunlight they need to photosynthesize, whereas the colour pigments protect the clam against excessive light and UV radiation. Adult clams can get most (70–100%) of their nutrients from the algae and the rest from filter feeding. [12] When disturbed, the clam closes its shell.
Pinna bicolor is native to Kwazulu-Natal, South Africa, and is commonly found in shallow waters up to 50 m (160 ft) deep. [6] [3] It also inhabits tropical zones from 35 o N-37 o S and 29 o E-154 o W; occurs from the south and eastern African coasts, Madagascar, the Red Sea, the Persian Gulf and India, as well as spanning from Japan to southern Australia and the whole East Indies.
The creature in the video is a Pacific razor clam, though it looks enough like a geoduck to befuddle even a knowledgeable biologist: Digging into wet sand is a survival technique for the critter ...
Tridacna noae, also known as Noah’s giant clam or the Teardrop giant clam, is a species of giant clam. Up until recently, T. noae was confused with the small giant clam Tridacna maxima, [4] [5] but is now known to be its own independent species. It has a broad distribution in the Indo-Pacific. [4]