Topic: Shell FisherySubject: Economic Zoology

PresenteRs: ABDUL QAHAR Anwar Zada Alia Syed Asad Ali

Presented TO: Respected Sir ,Waqas Ahmad Shams

Buner Campus

Deptt:

Zoolo

gy (M

.Sc)

Semes

ter:

4th

Shellfish:

An aquatic animal, such as a mollusk or crustacean, that has a shell or shell-like exoskeleton.

Shell Fishery: The Study Of Shell fish is called shell fishery.

OR

A commercially exploited {make full use of and derive benefit from (a resource)} population of shellfish.

ORThe industry or occupation of catching, processing, or selling shellfish.

They Have shells instead of backbones

OR

TWO CLASSIFICATIONS OF WATER ANIMALS

• Finfish (Often called

“FISH)– Fins and backbones.

• Shellfish– Shells instead of

backbones.

SHELLFISHAre distinguished from fin fish by their hard outer shells and their lack of backbones or internal skeletons.

SHELLFISH

CLASSIFICATION of

7

Mollusks are soft sea animals.OR Soft bodies that are partially or fully covered by hard shells There are three types that are commonly

eaten: Bivalves have a pair of shells (like clams) Univalves have a single shell (like conch) Cephalopods have a single thin internal shell

called a cuttlebone (like octopus)

Shellfish

Those with one shell are known as Gastropods.

Conch clamsoctopus

Cephalopod

Crustaceans are animals with segmented shells and jointed legs (like lobster)

Crustaceans:

Animals Covered by crust like shells and have segmented

bodies

Crustaceans:

OR

Shellfish

Lobster

Types of mollusks:

Oysters

Clams

Scallops

Types of Crustaceans:

Shrimp

Lobster

Crabs

Shellfish

Mollusks

Oysters

Clams Scallops

11

Shellfish

Crustaceans

Lobster

Crab

Shrimp

CLASSIFICATION• Mollusks- are soft

sea animals.

Categories:Bivalves: which have pair of

hinged shellsEx: clams, oysters, mussels,

scallopsUnivalves: which have a

single shell Ex: abalone, conch

Cephalopods: squids, octopus, cuttlefish.

• Crustaceans – are animals with segmented shells and jointed legs.

• CLAMS:

Hard shell clams : These go/known by different names depending on size.

little necks: the smallest and tenderest, for eating raw or steam.

Cherrystones: med sized, most common, they can be eaten raw and good for steaming, a little tougher than little neck.

Chowders: largest also called quahogs. Tough they are chopped for cooking chowders.

Soft shell clams: these are sometimes called longnecks, because of the long tube that protrudes bet the shells, they have very thin shells that sometimes they don’t close completely, also called steamers, because the usual way of cooking them is to steam.

MARKET FORMS:• Live in the shell• Shucked, fresh or frozen• Canned whole or chopped

Shellfish

MOLLUSKS

Shellfish• Oysters

– Can be purchased • live in the shell• Fresh or frozen

shucked (covered)

• Canned (Preserved and sealed in a can or jar.)

– Packaged according to size

– Live Oysters• Tightly closed

shells• Shells that

close quickly when touched

– Shucked Oysters• Plump (having a

full rounded

shape)• Creamy in

color• Odorless

Shellfish

• Clams– Available

• Live in the shell• Fresh or frozen shucked• Canned-packaged according to size

– Shucked clams should be…• Plump• Odorless• Creamy colored

– The shells of live clams should be tightly closed or should close when touched

Shellfish

• Scallops– Two varieties available

• Tiny bay scallops– Creamy white or pink in color

• Larger deep sea scallops– White in color

– Cannot buy scallops in the shell– Available fresh or frozen– Whole body is edible…commonly in the U.S. only the

large muscle used to close the shell is eaten!

Shellfish

CRUSTACEANS

Shellfish

• Shrimp– Many varieties – Most sold without the

head and thorax– You may need to peel

away the outer shell– Before cooking, remove

intestinal tract called deveining

– Marketed according to the number needed to weigh 1 pound

– Marketed by size• large, medium, small

– Frozen shrimp may be purchased uncooked or cooked and either peeled or unpeeled

– When purchasing…look for shrimp that’s odorless with firmly attached shells

Shellfish

• Lobster– Dark, blue-green when

removed from water– Become red when

cooked– Can be purchased

• Live• Frozen whole or tail• Cooked• Canned

– When buying live lobster, look for…

• Those with tails that snap back quickly after being flattened

Shellfish

• Crabs– Common species are the blue and

Dungeness crab– Can be purchased

• Live• Cooked fresh or frozen• Canned

Shellfish Harvesting• Harvesting methods

– Diving– Dredging– Trapping and pots– Tongs and rakes

Trapping fish in pots

Tongs

Rakes

Dredging

Tongs

Shellfish: Signs of Freshness

1. Shell of shrimp should be firmly attached with no noticeable odor

2. Sea scallops should be white; bay scallops are pink or creamy white

3. Live oyster and clam shells should be tightly closed

4. Shucked oysters and clams should be plump, creamy white and odorless

Guidelines for cooking shellfish

• Cook for a short period of time at moderate temp.

• Overcooking causes tough body.

• Cooking methods:– Simmering ( to

cook in a liquid at or just below the 

boiling point.)

– Baking {To cook (food) with dry heat, especially in an oven.

}

– Broiling (To cook by direct radiant heat, as over a grill or under an electric element.)

– Pan-frying (To fry in a frying pan or skillet with a small amount of fat.)

– Deep-fry {to cook (food) in a deep layer of oil or fat}

– Microwave (to cook or heat in a microwave oven)

Pan-frying

Deep-fry

Microwave Oven

Baking

Simmering

Broiling

General Hints

• To reduce fat content when purchasing Shellfish…look for Shellfish stored in water rather than oil

• When serving shrimp cocktail…purchase large, fancy shrimp rather than the small shrimp

fancy shrimp

shrimp

Aquaculture

• Aquaculture, also known as aquafarming, is the farming of aquatic

organisms such as fish, crustaceans, molluscs and aquatic plants.

• Aquaculture involves cultivating freshwater and saltwater populations

under controlled conditions.

• Particular kinds of aquaculture include fish farming, shrimp farming, 

oyster farming and the cultivation of ornamental fish.

Aquaculture installations in Southern Chile

• Shellfish are grown in artificial containers such as earthen ponds,

cages and concrete or fiberglass tanks. The cultured organism is

reproduced and offspring raised in captivity. The young organisms

are stocked at a known density and fed a nutritionally complete diet

to maximize growth rate. Water quality is monitored to maintain a

healthy environment. Animals are harvested with nets when they

reach market size.

History

• Aquaculture was operating in China since 2500 BC.

Crustaceans:

Commercial shrimp farming began in the 1970s, and

production increases after that.

About 75% of farmed shrimp is produced in Asia, in particular

in China and Thailand. The other 25% is produced mainly in America,

where Brazil is the largest producer. Thailand is the largest exporter.

Molluscs:

• Aquacultured shellfish include various oyster, mussel and clam

species.

• Abalone farming began in the late 1950s and early 1960s in

Japan and China.

Abalone farming

Guidelines for storing Shellfish

• Highly perishable

1. Refrigerator: Store in a tightly closed container in the coldest part of the refrigerator and use within a day or two.

2. Freezer: wrap in moisture-proof and vapor-proof material

3. Canned: store in a cool, dry space. Refrigerate unused portions

4. Temperature must be keep 29° to 32°F

(–2° to 0°C).

Global aquaculture production by country 2010

Some interesting facts about shellfishery

• Alaska is the largest producer of shellfish in the United States.

• Shrimp and oysters are the most important shellfish in the United States in terms of the amount eaten!

• Some molluscs, such as squids and cuttlefish, have their shells inside their bodies.

• Despite the name, shellfish are not a kind of fish, but are simply water-dwelling animals

• The Jewish laws of Kashrut forbid the eating of shellfish.• Shellfish are low in calories (heat), fat, and sodium and high

in vitamins A, B, and D and protein.• Most molluscs with shells can produce pearls.

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