1. Welcome to
My
Presentation

2. My presentation topic is on
Swim bladder of fish

3. Introduction
Air bladder also called,
swim-bladder,
gas-bladder and
fish maw.
What is air bladder?
 Internal gas-filled organ
 Contributes to the ability to control their
buoyancy
 It acts as an accessory respiratory organ
 It acts as a sound receptor and sound producer.

4. Air bladder

5. Location of swim bladder
 It is located between the kidney
and alimentary canal, connected
with the esophagus and sometimes
it is also connected with the gill.

6. Types
There are two types :
1. Physostomous swim bladder
(directly connected to the
gastro intestinal track)
2 . Physoclistous swim bladders
( not connected to the digestive
tract )
Type-1
Type-2

7. Basic structure
 Sac-like structure
 It’s consist of two layers
1. Epidermis
2. Endodermis
Tunica externa made up of dense collagenous fibrous
material. Its related to epidermis.
 In the posterior chamber outside the layer of muscularis
mucosa there is a glandular layer which is richly supplied
with blood capillaries from rete-mirabile.

8. Shape and size of swim-bladder
The swim-bladder varies extensively in shape
and size such as-
1.Umbrina(oval shaped and without any
appendage)
2.Atractoscion (only one pair of simple
diverticula)
3. Kathala (Develops a pair of appendage in
front of transverse septum into head)
4. Otolithoides (appendages attached to posterior
end main part lying parallel)
5. Johnius (hammer-shaped , 12 to 15 pairs
arborescent appendages)

9. How do fish rise and sink in the water using air bladder?
To rise, a fish must reduce its overall
density by increasing its volume without
significantly increasing its mass and it
accomplishes the task by filling the air
bladder with air.
To sink it just releases the air in the air
bladder to reduce its overall volume and its
sinks in the water

10. Functions of swim-bladder
The swim-bladder in fishes performs a variety of functions.
1. Hydrostatic organ
2. Swim-bladder acts as adjustable float
3. Swim-bladder helps in respiration
4. Production of sound
5. Maintains proper center of gravity

11. Conclusion
Air bladder is very important for fish as it helps the
fish to maintain its bouncy.
The air bladder has evolved from the past ages to
the present
It is also used in making of various kinds of dishes