1. Fish Facts - Fish
Classification
Year 7 Rei Kobayashi 2011

2. Shellfish
• Shellfish are broadly divided into two
categories—molluscs and crustaceans.
shell fish shell fish

3. 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.
mollusc mollusc

4. Bi-valve molluscs
• Bi-valve molluscs have two shells
hinged at one end—mussels, oysters
and scallops.
oyster mussel scallop

5. Cephalopods
• have no outer shell, just a single
internal one called a pen. Examples
include squid and cuttlefish.
cuttle fish squid

6. Cephalopods
• Crustaceans are mobile creatures with
hard, segmented shells and flexible
joints. Examples include prawns,
shrimp, crab and lobster
shrimp crab

7. whitefish and oil-rich fish
• Finfish are divided into
finfish finfish

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

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

10. Flat Whitefish
• —Examples include plaice, lemon sole,
brill, turbot and black sole.
lemon sole brill turbot black sole

11. Cartilaginous Fish
• Examples include ray, dogfish, shark.
dog fish
ray
shark

12. Oil-Rich fish
• are so called because the oils are
distributed throughout the flesh of the
fish. Mackerel, herring, salmon and
trout are examples
mackerel herring

13. Finfish
Demersal fish Pelagic fish
• 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.
herring mackerel tuna