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Uploaded byJubayr Al Mahabub
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Swim bladder

The document discusses the swim bladder, or air bladder, of fish. It is an internal gas-filled organ that contributes to a fish's ability to control buoyancy. There are two types - physostomous, which is directly connected to the digestive tract, and physoclistous, which is not connected. The basic structure includes a sac-like shape with two layers, an epidermis and endodermis. The swim bladder varies in shape and size between fish species and allows fish to rise and sink in water by increasing or decreasing the volume of gas inside without changing mass. Its key functions are to act as a hydrostatic organ, adjustable float, aid in respiration, produce sound, and maintain the fish's

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My presentation topic is on Swim bladder of fish
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.
Air bladder
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.
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
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.
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)
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
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
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
Swim bladder
Swim bladder