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Introduction to Marine Fishes

Introduction to Marine Fishes. Marine Vertebrates. Introduction:. Fish are the first vertebrates to appear more than 500 million years ago. Fish are the most abundant vertebrates in terms of both species and individuals. 58% of all fish are marine.

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Introduction to Marine Fishes

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  1. Introduction to Marine Fishes Marine Vertebrates

  2. Introduction: • Fish are the first vertebrates to appear more than 500 million years ago. • Fish are the most abundant vertebrates in terms of both species and individuals. • 58% of all fish are marine.

  3. External Fish Anatomy:Vocabulary to know… Dorsal fins Caudal fin (tail) Pectoral fins Anal fin Pelvic fins

  4. External Fish Anatomy:Vocabulary to know… Lateral line Eye Mouth Peduncle Operculum (gill cover)

  5. Jawless Fishes Kingdom: Animalia Phylum: Chordata Class: Agnatha Subclass: Myxini & Petromyzontida Species: About 88

  6. Jawless Fishes • Ancient group of vertebrates*, with several extinct groups • Only two extant groups (alive today) • Lampreys • Hagfish

  7. Characteristics of Jawless Fishes: • Lack jaws; feed by suction w/ round mouth and rows of teeth. • Body is cylindrical and elongated. • Lack paired fins. • No scales.

  8. Jawless Fish: Hagfish • Feed mostly on dead or dying fishes. • Eyeless, jawless, and dependent on their sense of smell to find food, hagfish invade feeble or dead fish by entering through their mouths and settling in their stomachs, where they secrete a slimy substance that protects them from the digestive juices of their hosts. They then eat their hosts from the inside out.

  9. Jawless Fish: Hagfish Sliming sharks more

  10. Jawless Fish: Lamprey • Primarily freshwater fishes, but some move to the sea as adults. • Attach to fishes and suck their blood.

  11. Jawless Fish: Lamprey

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