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Bony Fishes (Osteichthyes)

Bony Fishes (Osteichthyes). Bony fish ( Osteichthyes ) are the most successful and abundant of the 2 groups of fishes (96% of all fish; ~27,000 species)

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Bony Fishes (Osteichthyes)

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  1. Bony Fishes (Osteichthyes) • Bony fish (Osteichthyes) are the most successful and abundant of the 2 groups of fishes (96% of all fish; ~27,000 species) • Osteichthyes possess a hard, strong - but lightweight - skeleton made of calcium that supports them and is responsible for their success (and diversity) as a group • Bony fish include tuna, cod, flounder, goldfish, and other familiar species

  2. Bony Fishes (Osteichthyes) • The composition of their skeleton is not the only distinguishing feature of bony fishes • In contrast to the tiny, pointed placoid scales of cartilaginous fishes, bony fish usually have cycloid or ctenoid scales, which are thin, flexible, and overlapping • Cycloid scales have a smooth outer edge • Ctenoid scales have a toothed outer edge

  3. Bony Fishes (Osteichthyes) • The scales are made of bone and are covered by a thin layer of skin and a protective mucus • Bony fish are also characterized by the presence of a gill flap, or operculum

  4. Bony fish have a bony opeculumCartilaginous fish have gill slits kmle.co.kr

  5. Bony Fishes (Osteichthyes) • Bony fish are subdivided into two major groups • Lobe-finned fishes • Ray-finned fishes • Lobe-finned fishes are largely extinct, but include lungfishes and coelacanths • Ray-finned fishes, in contrast, are far more successful, and can be further divided into soft-rayed and spiny-rayed bony fish

  6. Soft-rayed vs. Spiny-rayed • Soft rayed fish representatives include: • Cod • Trout • Herring • Spiny-rayed fish representatives include: • Bass • Groupers • Reef fish

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