'Ctenoid scales' diaporamas de présentation

Chapter 8

Chapter 8. Marine Fishes. The First Vertebrates. Fishes appeared more than 500 million years ago Evolved from an invertebrate chordate. Importance. Feed on nearly all types of marine organisms The most economically important organisms Vital source of protein for millions of people

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General Classification

General Classification. Spiny-rayed fish Hard, sometimes sharp spines in dorsal fin Ex. Yellow Perch. General Classification. Soft-rayed fish Dorsal fin is without hard spines Usually have only 1 dorsal fin Adipose fin: small, fatty fin near caudal fin Ex. Trout. Fish Adaptations: Scales.

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