introduction and classification fish fisheries slideshare

1. SWIM BLADDER FISH
SUBMITTED TO :- SUBMITTED BY:-
MONUJ NEOG Head of JOHN BASUMATARY
ZOOLOGY B.Sc 6th SEM
LTK College, AZAD Roll No:-114

2. 1. INTRODUCTION
2. LOCATION OF SWIM BLADDER
3. TYPES OF SWIM BLADDER
1.Physostomous swim bladder
2.Physoclistous swim bladder
4. BASIC STRUCTURE
5. FISH RISE AND SINK IN WATER USING AIR BLADDER
6. FUNCTION OF SWIM - BLADDER
7. CONCLUSION
8. REFERENCES

3. INTRODUCTION :
 Air bladder also call,
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.

5. LOCATION OF SWIM BLADDER
1. It is located between the kindney and alimentary
canal, connected with the esophagus and sometimes it
is connected with the gill.

6. LOCATION OF SWIM BLADDER

7. TYPES OF SWIM BLADDER:
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)

8. BASIC STRUCTURE :
1.Sac-like structure
2.It’s consist of two layers
a) Epidermis
b) Endodermis
Tunica externa made up of dense collagenous fibrous
material. Its related to epidermis.
3. 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.

9. 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. Atractoscin (only one pair of simple diverticula)
3. Kathala (Develops a pair 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)

10. SHAPE AND SIZE OF SWIM-BLADDER:-

11. How do fish rise and sink in water using air bladder?
1. 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.
2. To sink it just releases the air in the air bladder to reduce
its overall volume and its sinks in the water.

12. How do fish rise and sink in the water
using air bladder?

13. FUNCTION OF SWIM-BLADDER:
The swim-bladder in fishes performs a variety of function,
1. Hydrostatic organ
2. Audiotory
3. Sensory
4. Production of sound
5. RESPIRATORY

14. CONCLUSION :-
1. Air bladder is very important for fish as helps the
fish to maintain its bouney.
2. The air bladder has evolved from the past ages to
the present.
3. It is also used in making of various kinds of dishes.

15. REFERENCES:-
Blaxter J.H.S. , 1981. Swimbladder and hearing. In: Tavolga
W.N., Popper A.N, Fay R.R.(End), hearing and sound
communication in fishes, springer- Verlag
NEW YORK Inc.,67-71
Fange R.,1983. GAS exchange in fish swim bladder. In: reviews
Of physiology ect.