Oysters

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Oysters

• Emilie Blotiau

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Scientific Name

• Oysters scientific name is Crassostrea madrasensis

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Physical Characteristics

• Have a rough outer shell.
• Inner shell is smooth from the erosion of sand.

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Anatomy

• Oysters have gills like fish that filter the
  oxygen out of the water.
• They are filter feeders, and use beating cilia to
  catch food.
• They have a small three chambered heart that lies
  under the adductor muscle.
• The mantle contains many small blood vessels
  which filter for oxygen in the water.

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Habitat

• Live mostly in the intertidal zone.
• Live between rocks and attached to hard
  substrates.
• No preference to ocean temperature however they
  feed best at 50 degrees.
• Reside mostly in brackish water.

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Oysters Diet

• Oysters are filter feeders.
• Plankton and other particles are caught by the
  beating cilia, and get stuck in the mucus
  membrane of the gills.
• The gills transport the food to the stomach.

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Reproduction

• One cannot determine if an oyster is male or
  female by their shells.
• they are one sex or the other (not
  hermaphroditic).
• Can change sex once or more during their
  lifetime.
• It is almost impossible to tell the age of an
  oyster.

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Interesting Facts

• Some types of oysters can produce pearls inside
  their shells.
• They can grow to be about a foot long.
• Oysters have blood and veins, their blood is
  colorless.
• It is extremely hard to open a live oyster shell.
  You must use a knife.

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Pictures
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Find the oyster in the pictures!
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