1. FISH TOPIC
Myles Wood Year 7

2. SHELLFISH
Shellfish are broadly divided
into two categories—molluscs
and crustaceans
Molluscs
Crustaceans

3. MOLLUSCS CAN BE DIVIDED
INTO THREE CATEGORIES:
Uni-valve molluscs have one Periwinkles
shell—periwinkles, whelks and
limpets. These molluscs can be
found on the seashore.
Limpets
Whelks

4. BI-VALVE MOLLUSCS
have two shells hinged at one
end—mussels, oysters and
scallops. Mussels
Oysters
Scallops

5. CEPHALOPODS
have no outer shell, just a
single internal one called a
Squid
pen. Examples include squid
and cuttlefish.
Cuttlefish

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

7. FIN FISH
Finfish are divided into
whitefish and oil-rich fish. Whitefish
Oil-rich fish

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

9. WHITEFISH ARE FURTHER
SUB-DIVIDED INTO:
Round Whitefish—Examples
include cod, haddock, hake and
pollock.
Cod Pollock
Haddock
Hake

10. FLAT WHITEFISH
Examples include plaice, lemon
sole, brill, turbot and black
sole.
Black sole
Lemon sole
Turbot
Plaice Brill

11. CARTILAGINOUS FISH
Examples include ray, dogfish,
shark.
Ray
SHARK
Dogfish

12. OIL-RICH FISH
re so called because the oils
are distributed throughout the
flesh of the fish. Mackerel, Trout
herring, salmon and trout are
examples.
Salmon Herring
Mackerel

13. 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.