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The shell has a rounded outline, with a nearly equal height and width. Oyster shells are usually oval or pear-shaped, but will vary widely in form depending on what they attach to. Oysters have a strong inner shell layer composed of nacre, also known as "mother of pearl". An oyster can filter 1.3 gallons of water per hour.
Filters have different jobs, including making sure there is algae to feed the oyster larvae and cleaning the water to maintain a suitable environment for their growth. In addition to the nursery tank system, small boats and rafts made in Italy are used to gather oysters that cannot be reached by bare foot.
Under ideal laboratory conditions, an oyster can filter up to 190 L (50 US gal) of water per day. Under average conditions, mature oysters filter 11–45 L (3–12 U.S. gal). Chesapeake Bay 's once-flourishing oyster population historically filtered excess nutrients from the estuary's entire water volume every three to four days.
Billion Oyster Project is a New York City-based nonprofit organization with the goal of engaging one million people in the effort to restore one billion oysters to New York Harbor by 2035. Because oysters are filter feeders , they serve as a natural water filter, with a number of beneficial effects for the ecosystem. [ 1 ]
Following the increasing of Internet usage in Vietnam, many online encyclopedias were published. The two largest online Vietnamese-language encyclopedias are Từ điển bách khoa toàn thư Việt Nam, a state encyclopedia, and Vietnamese Wikipedia, a project of the Wikimedia Foundation.
Pinctada fucata, the Akoya pearl oyster (阿古屋貝), is a species of marine bivalve mollusk in the family Pteriidae, the pearl oysters. Some authorities classify this oyster as Pinctada fucata martensii (Gould, 1850). [1] It is native to shallow waters in the Indo-Pacific region and is used in the culture of pearls.
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[6] In this section, oyster is used to mean "members of Ostreoidea". Oysters of this group generally attach to a substrate by cementing their left valve to it. The two valves are unequal: the attached left valve is larger and more cupped than the right 'lid' (to a greater or lesser extent, depending on the species).