1. FISH FACTS
by Hamza
year 7

2. Shellfish
Shellfish are broadly divided into two categories
molluscs and crustaceans.

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

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

5. Bi-valve molluscs
have two shells hinged
at one end—mussels,
oysters .

6. Finfish
Finfish are divided into cuttlefish and oil-rich fish.

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

8. Finfish
Finfish are divided into whitefish and oil-rich fish.

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

10. Finfish
Finfish are divided into whitefish and oil-rich fish.

11. Whitefish are further sub-
divided into
Round Whitefish—Examples include cod, haddock,
hake and pollock.

12. Flat Whitefish
Examples include plaice, lemon sole, brill, turbot and
black sole.

13. Cartilaginous Fish
Examples include ray, dogfish, shark.

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

15. 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.