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CRUSTACEANS

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close cousins of lobsters, crabs, and shrimp. lobsters, crabs, and ... predators include: otters, raccoons, minks, fish, turtles, snakes, some birds, people ... – PowerPoint PPT presentation

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Title: CRUSTACEANS


1
CRUSTACEANS
  • name comes from hard, crusty body armor
  • most crustaceans live in ocean
  • some well known crustaceans are
  • lobsters
  • crabs
  • shrimp
  • crayfish

2
Crayfish
  • close cousins of lobsters, crabs, and shrimp
  • lobsters, crabs, and shrimp live in salt water
  • crayfish live in fresh water
  • lakes and streams
  • found on every continent except Africa and
    Antarctica
  • more than 230 specieskinds live in USA
  • new species discovered every year

3
Crayfish Facts
  • arent fish
  • breathe with gills
  • gills take oxygen from water
  • crayfish can stay out of water as long as gills
    are wet
  • have 5 pairs of legs
  • 4 pairs are for moving
  • 1 pair form a set of pincers
  • pincers used to grab things, especially food
  • also used for digging

4
Crayfish Growth
  • hard shell doesnt grow
  • crayfish gets too big for shell
  • MOLTS - breaks out of old shell
  • skin hardens into new shell
  • molt many times as they grow
  • also REGENERATE body parts
  • can grow new legs, claws etc. if one is lost

5
Crayfish Eating Habits
  • hunt for food at night
  • will eat just about anything small
  • help clean up streams and lake beds
  • eat decaying plants and animals

6
Crayfish Sensing
  • have eyes on stalks that can move all around
  • in front of eyes 2 sets of feelers/antennae
  • one set is long
  • one set is short
  • antennae covered with tiny hairs
  • tiny hairs help crayfish touch, taste, smell
  • opening where each short antenna joins head
  • openings lined with hair
  • hairs sense movement in water

7
Crayfish Reproduction
  • reproduce with eggs
  • female lays eggs
  • crawls into a hiding place to protect eggs
  • eggs hatch
  • babies stay stuck to mothers tail until ready to
    swim on own

8
Crayfish Protection
  • predators include otters, raccoons, minks,
    fish, turtles, snakes, some birds, people
  • crayfish can hide under a rock or burrow
  • threaten enemies with claws
  • can swim backwards
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