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Class : Osteichthyes

This class includes fishes with bony endoskeleton. Fins also have bony rays.

Habitat: They are found in both marine and fresh water habitats.

Examples:

MarineFreshwaterAquarium
4745215397_2cae4bcc39_b.jpgImage result for Labeo flickrRelated image
Exocoetus (Flying fish)Labeo (Rohu)Betta (Fighting fish)
Related imageRelated imageRelated image
Hippocampus (Sea horse)Clarias (Magur)Pterophyllum (Angel fish)

Body characteristics:

  • Their body is streamlined.
  • Mouth is mostly terminal.
  • They have four pairs of gills which are covered by a bony operculum on each side.

  • Skin is covered with cycloid/ctenoid scales. Some species do not have scales.
  • They bear lateral line sense organs.
  • Air bladder is present which regulates buoyancy.
  • Heart is two chambered (one auricle and one ventricle).

http://abacus.bates.edu/acad/depts/biobook/Fish11.jpg

Physiology: They are cold-blooded (poikilothermic) animals.

Notochord: Endoskeleton (notochord and cranium) is made of bone.

Reproduction: Sexes are separate. Fertilisation is usually external. Claspers are absent. They are mostly oviparous and development is direct.

 

 

 

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