JOHN BASUMATARY3.pptx .swim bladder

introduction and classification fish fisheries slideshare

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

2. CONTENTS INTRODUCTION LOCATION OF SWIM BLADDER TYPES OF SWIM BLADDER 1. Physostomous swim bladder 2. Physoclistous swim bladder BASIC STRUCTURE FISH RISE AND SINK IN WATER USING AIR BLADDER FUNCTION OF SWIM - BLADDER CONCLUSION 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 .

4. 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 .

5. LOCATION OF SWIM BLADDER

6. 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)

7. 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 .

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 . 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)

9. SHAPE AND SIZE OF SWIM-BLADDER :-

10. 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.

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

12. 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

13. 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 .

14. 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.