2.  Perch are bony fish, they have an
endoskeleton made mostly of bone

3.  They are covered
in thick, keratin
heavy scales
 These help
reduce friction in
the water so fish
can swim quickly
 They also protect
soft tissue from
damage

4.  Most bony fish have two eyes without eyelids
 They do have a protective layer

5.  There are 4 pairs of gills, one on each side of
the head, and they are protected by an
operculum
 The operculum also force water over the gills
to help the fish breathe

6.  Similar to cartilaginous fish, bony fish have 5
different types of fins:
 Dorsal
 Pectoral
 Pelvic
 Anal
 Caudal

7.  Perch, like all fish possess a lateral line used
to detect pressure changes

8.  To reach the internal organs, a window is cut
on one side of the fish

9.  A perch has a complete digestive system, a
closed circulatory system, and a complete
reproductive system

10.  One major difference between bony and
cartilaginous fish is buoyancy
 Bony fish has a normal-sized liver, and
instead use a gas (swim) bladder to stay
afloat

11.  Perch have complex brains