Barnacles

• Live in intertidal to shallow subtidal zone

• Sessile (non-mobile)• Filter feeders• Attach permanently to a

hard substrate and encrust it.

• Eat mostly plankton

Crabs

• Decopods (10 feet)• Typically walk sideways• Benthic: intertidal to

subtidal• Mostly scavengers and

are omnivores.• Claws are used for

clasping food and attracting mates.

Lobsters• Decopods• Benthic: Subtidal rocky or

muddy bottoms• Tropical to mid-latitude waters.• Use Antennae as sensors• Have blue blood due to copper

in their blood.• The green in lobster is due to a

special pancreas.• Eat live prey such as small fish

and molluscs. • Sometimes eat other lobsters

Shrimp• Decopod• Includes plankton such as

copepods and krill• Live on muddy and rocky

bottoms: Subtidal• Swim better than they walk• Important food source for

fish and whales• Feed on other plankton

and algae

Commercial Uses

• Primarily food• Shrimp are a 50 billion dollar/year industry• Lobstering and Crabbing are also billion dollar

industries.• Market price for a whole Maine lobster can range

anywhere from 8-80 dollars depending on where you buy it.

• Dungeness Crab, King Crab, Snow Crab, and Blue Crab are the most popular to find in restaurants and grocery stores.