Notes on Marine Fishes

Notes on Marine Fishes - jaw flexibility. Many bony fishes...

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Notes on Marine Fishes Marine Fishes Ichthyology: study of fishes Vertebrates are chordates that have four principal characteristics: They have a single, dorsal, hollow nerve cord They have gills or pharyngeal, slits They have a notochord They have a post-anal tail   Fishes are the oldest living vertebrates Types of Fishes Jawless Fish      (Agnatha) Cartilaginous Fish      (Chondrichthyes) Bony Fish (Osteichthyes) o Characteristics: Bony fishes have bony skeleton They usually have ctenoid or cycloid scales, which are made of bone. Some bony  fishes lack these scales. Ctenoid scales: contains tiny spines Cycloid scales: smooth Bony fishes have a flap of tissue and bone plates called operculum . The operculum protects the gills of the bony fish. Bony fishes have jaws that protrude outward from the mouth, which gives more 
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Unformatted text preview: jaw flexibility. Many bony fishes have a swim bladder that allows them to adjust to sinking and rising. Some bony fishes can change color with the help of chromatophore cells on the skin. o Majority of the marine-fishes are bony fishes Key Terms: Anadromous fishes : most of their lives are spent in the ocean, but these fishes migrate to fresh water to breed Catadromous fishes : most of their lives are spent in the fresh water (rivers), but they breed at the sea. Oviparous : animal that releases the eggs Ovoviviparous : animals that produces eggs that will hatch inside the female animal right before birth Viviparous: live-bearers; eggs will develop inside the mother, while the embryo derive nutrition from its mother....
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Notes on Marine Fishes - jaw flexibility. Many bony fishes...

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