The document introduces different types of shellfish - crustaceans, mollusks, and cephalopods. Crustaceans have a hard exoskeleton and include crabs, lobsters, shrimp, and prawns. Mollusks have a soft body and include bivalves like clams and oysters, and univalves like snails. Cephalopods like squid and octopus have a reduced internal shell. Popular crustaceans include king crab, snow crab, blue crab, and Dungeness crab. Oysters are the most prized mollusk.

1. Welcome to our presentation
Md. Mamun Hasan
Dept. of THM
University of Dhaka.

2. Shellfish

3. SHELLFISH
• Shellfish can be divided into three groups:
– CRUSTACEANS:
• Covered by firm shells and have segmented bodies
• EX: Shrimp, lobster, crabs
– MOLLUSKS:
• Soft bodies that are partially covered by hard shells
• EX: Oysters, clams, scallops
– Cephalopods
• Though technically classed as mollusks
• Have a reduced internal shell called cuttlebone
• Ex: octopus, cuttlefish

4. Crustaceans
• Crustaceans
– Have a hard outer skeleton or shell
– Jointed appendages
– Bone, outer jointed shell

5. Crustaceans
• Crayfish
-Small fresh water fish.
- Average length 2 to 8 inches.
• Crabs
– King crabs
– Dungeness crabs
– Blue crabs
– Snow or spider crabs
– Stone crabs

6. Crabs
King Crab Legs
Snow Crab Legs
Blue Crab
Dungeness Crab

7. Crustaceans
• Lobsters
– Maine lobsters
– Spiny lobsters
– Slipper lobsters
– Langoustine
• Shrimp
• Prawn

8.  Mollusks are soft sea animals. There are two
types that are commonly eaten:
 Bivalves have a pair of hinged shells (like clams)
 Oysters are the most prized member of mollusks family
 Taste depend less on species, more on where they
grown
 Univalves have a single shell (like conch)
 Snails the best known of univalves
Mollusks

9. Cephalopods
- Squid, the most popular
- Cooked in High heat or long period of time under low heat