Oysters, belonging to the family Ostreidae, are bivalve mollusks found in marine or brackish environments. They have a rough, irregular shell and are known for their ability to filter water, providing crucial ecosystem services. Oysters are sessile, often forming reefs that offer habitat and protection for other marine life.

Ostreidae, commonly known as true oysters, are found in marine and brackish waters worldwide. They are distributed across various regions, including the coasts of North America, Europe, Asia, Australia, and parts of Africa. In the United States, they are primarily found along the Atlantic and Gulf coasts.

Oysters typically inhabit shallow coastal waters and estuaries, where they can attach to hard substrates like rocks, piers, and other oyster shells. They thrive in areas with a high concentration of nutrients and prefer salinities ranging from 14 to 28 parts per thousand. The temperature range they can tolerate is generally between 10°C and 30°C.

Ostreidae play a crucial role in coastal ecosystems as filter feeders. They filter plankton and other small particles from the water, which helps to improve water quality. Oysters also provide habitat and shelter for a variety of marine organisms, contributing to biodiversity. They are important both ecologically and economically, serving as a food source for humans and other animals.