Question:
Swim bladder is present in:
Swim bladder is present in:
Updated On: Jun 5, 2023
- star fishes
- bony fishes
- carp fishes
- all of these
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The Correct Option is B
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Swim bladder or air bladder lies in the body cavity but outside of coelom in bony fishes such as Rohu (Labeo rohita) it is an elongated, white, thin walled sac. filled with air. Swim bladder functions like a hydrostatic organ. It regulates specific gravity of body by secretion or absorption of gas in the air bladder.
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The swim bladder is positioned in the bodily cavity and is derived from an out-pocketing of the digestive tube. It is filled with gas (often oxygen) and functions as a hydrostatic or ballast organ, helping the fish to maintain its depth without floating upward or sinking.
It also serves as a resonating chamber for both creating and receiving sound.
The swim bladder is related to the fish's inner ear in some species, especially freshwater fish (catfish and bowfin). Four Weberian ossicles from the Weberian apparatus connect them. These bones can transfer vibrations to the saccule and lagena (anatomy).
Swim bladders may be found in a wide range of bony fish but not in cartilaginous fish.
It also serves as a resonating chamber for both creating and receiving sound.
The swim bladder is related to the fish's inner ear in some species, especially freshwater fish (catfish and bowfin). Four Weberian ossicles from the Weberian apparatus connect them. These bones can transfer vibrations to the saccule and lagena (anatomy).
Swim bladders may be found in a wide range of bony fish but not in cartilaginous fish.
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Concepts Used:
Classification of Animals
Classification of Animal Kingdom:
One of the most fundamental forms of classification of animals is the presence or absence of the notochord. Hence, two major groups exist, namely: Chordates and Non-chordates
Non-chordates and the Chordates-
- The notochord is a flexible rod made out of a material similar to cartilage. If an animal has a notochord during any stage of its life, it is classified as a chordate. Contrary to popular belief, chordates do not exclusively include vertebrates.
- There are invertebrates that possess a notochord during some point in their lives and hence, are classified as chordates. Thus all vertebrates are chordates but not all chordates are vertebrates.
Non-chordates-
- Non-chordates are animals without a notochord – the rod-like elastic structure that supports the body. This phylum consists of a small group of worm-like, marine species with an organ-system level of organization.
- Members of phylum Porifera, Coelenterata, Ctenophora, Platyhelminthes, Aschelminthes, Annelida, Arthropoda, Mollusca, Echinodermata and Hemichordata fall under Non-chordates
Vertebrates Classification:
The subphylum Vertebrata is divided into five classes of vertebrates. These five classes of vertebrates comprise of all the species of animals and have developed vertebral column as well as an internal skeleton.
Other characteristic features of vertebrates are-
- Presence of a true vertebral column and internal skeleton with muscle attachment points for body movement.
- A front-side muscular heart with two, three or four chambers.
- Kidneys for excretion and osmoregulation
- A paired appendages which may be fins or limbs.
- Possess notochord during the embryonic stage.
- Vertebrates are the only chordates to possess a brain as a part of the central nervous system.
Classification of Vertebrates-
- Pisces
- Amphibia
- Reptilia
- Aves
- Mammalia