Oysters: What are they?

April 28, 2015 by Melissa

Oysters include bivalve mollusks discovered in most oceans of the world. Human beings see them as an economically valuable creature because they’re able to offer a food source and pearls, distinctive lustrous items utilized in ornaments and jewelry in multiple cultures. Additionally, they seem to be efficient scrubbers of polluted water, as was indicated in many experiments in the U.S. in 2006. Most other animals also are fond of oysters, because of their protein rich, flavorful flesh.

Every oyster is inside the family Ostreidae. They’re filter feeders, and open their shells to permit water to pass through the gills, and supply them with needed oxygen and food. Due to this, they may be utilized to clean impure water, though it might injure the oysters themselves as they’ll accumulate toxins. Oysters usually root into place upon a rock, permitting the tides to fulfill their requirements.

Human beings are amongst the main predators of oysters, though they also are consumed by marine mammals and organisms such as starfish. The relationship between oysters and humans is very old; most early human beings greatly appreciated them since they’re relatively simple to harvest and very high in nutrition. A handful of human beings regard the mollusks as a delicacy, and they’re oftentimes consumed raw for their aphrodisiac quality. Also, they might be cooked in chowders and seafood stews, though they may get rubbery with excess cooking.

A mechanism of oyster defense will be of particular interest to human beings. As an irritant like a grain of sand or a rock enters its shell, it’ll cover it in nacre layers, a secretion which will harden into a glossy, smooth ovoid shape well-known as a pearl. Additional mollusks like abalone also will form pearls, yet oyster pearls are amongst the most broadly harvested worldwide, and in a few nations individuals actually farm oysters in order to grow pearls for commercial sale.