these slide include types of fish scales which are cycloid scales, ctenoid scales & may be other scales

1. FISH
Scale
s
By Pankaj Kukreti

2. What are Scales ?
 Scales are generally hard protective
outermost layer of many vertebrates
 They also act as exoskeleton in many
organism
Scales

3. ORIGIN & TYPES..
 They may be derived from dermal or
epidermal layer of skin
 In Fish dermal scale are present, & are of
several types
Note :-
Fishes like cat fish , electric ray there is
no scale present & in chimaeras scales
located few region only

4. Cycloid
Types
Ctenoid
Placoid
Ganoid

5. CTENOID SCALE:-
 These Scale having
comb like projection
 These scales are thin &
translucent.
 There arrangement in
such a way one overlap
other

6. GANOID SCALE
 Rhomboid in shape
 These Composed of bone
with lacunae & canaliculi
 Have shiny substance
ganoin

7. PLACOID SCALE
 These scale consist
diamond shape bony
basal plate
 Having trident spine
which projects out
 In saw fish they
modified into large
spine

8. CYCLOID SCALE:-
 Roughly Circular in
Outline
 Commonly Found In
carps

9. SUSCIBE US
PresFeOnR tMMORaE
m