FISH TOPICMyles Wood Year 7

SHELLFISHShellfish are broadly divided into two categories—molluscs and crustaceans

MolluscsCrustaceans

MOLLUSCS CAN BE DIVIDED INTO THREE CATEGORIES:

Uni-valve molluscs have one shell—periwinkles, whelks and limpets. These molluscs can be found on the seashore. 

Limpets

Whelks

Periwinkles

BI-VALVE MOLLUSCShave two shells hinged at one end—mussels, oysters and scallops. Mussels

Oysters

Scallops

CEPHALOPODShave no outer shell, just a single internal one called a pen. Examples include squid and cuttlefish. 

Squid

Cuttlefish

CRUSTACEANS

are mobile creatures with hard, segmented shells and flexible joints. Examples include prawns, shrimp, crab and lobster. Lobster

Crab Shrimp prawns

FIN FISHFinfish are divided into whitefish and oil-rich fish.  Whitefish

Oil-rich fish

WHITEFISHare sometimes referred to as "lean fish" because all the oils are contained in the liver, which is removed during gutting.

WHITEFISH ARE FURTHER SUB-DIVIDED INTO:

Round Whitefish—Examples include cod, haddock, hake and pollock. 

Cod

HaddockHake

Pollock

FLAT WHITEFISHExamples include plaice, lemon sole, brill, turbot and black sole.  Black sole

TurbotBrillPlaice

Lemon sole

CARTILAGINOUS FISHExamples include ray, dogfish, shark.

SHARK

Dogfish

Ray

OIL-RICH FISHre so called because the oils are distributed throughout the flesh of the fish. Mackerel, herring, salmon and trout are examples.

Trout

HerringSalmonMackerel

Finfish are occasionally classified in a different way—according to where they swim in the sea.

Demersal fish are those which live on or near the seabed. Round and flat whitefish fall into this category.

Pelagic fish swim in mid-waters or near the surface. Examples are oil-rich fish such as mackerel, herring and tuna.