What are oysters?

Oysters are foggy molluscs found in many oceans in the world. People consider them an economically valuable animal because they can provide a source of food and pearls, distinctive shiny objects used in jewelry and ornaments in many cultures. In addition, they seem to be effective washing machines of polluted water, as shown in several experiments in the United States in 2006. Many other animals also have oysters, thanks to their tasty protein -rich meat. Bovalves have two shells that are associated with a small curtain. Animals can open their shells to receive food and eliminate waste, and can close their shells if predators are at risk. Like other molluscs, oysters have relatively simple biological systems and can be found in brackish water and salt water. Some may also move further inland to fresh water, although these species are more rare.

all oystjs in the family ostreidae . Animals are filter feeders, open shells to make water pThe gills were roaming, giving them food and the necessary oxygen. For this reason, they can be used to clean unclean water, even if it can hurt oysters when toxins accumulate. They tend to take root on site on the rock, allowing the influx to meet their needs.

People are among the main predators of oysters, although animals are also consumed by sea mammals and organisms such as starfish. The relationship between people and oysters is quite old; Many early people enjoyed them very much because they are relatively easily harvested and high nutrition. Some people consider molluscs a delicacy and often consume raw for their allegedly aphrodisiac quality. They can also be cooked in the seafood of steamed surfaces and chowders, although they can get rubber -cooking with excess.

One mechanism of defense of oysters is particularly interesting for people. When irritability, such as a rock or a grain of sand, an animal enters the shellIt covers it with a layer of Nacre, secretion that solidifies into a smooth, shiny egg shape better known as a pearl. Other molluscs, such as Abalone, will also form pearls, but the oyster pearls are among the most commonly harvested around the world, and in some nations people actually keep oysters to cultivate pearls for commercial sales.