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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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General Classification

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  1. General Classification • Spiny-rayed fish • Hard, sometimes sharp spines in dorsal fin • Ex. Yellow Perch

  2. 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

  3. Fish Adaptations: Scales • Hard, sometimes colorful, overlapping plates • Provides protection from predators and disease/ infection

  4. 4 Types of Scales • 1. Placoid: rectangular base, under the skin, spines project to the surface of the skin • New scales are added, do not grow with the fish • Examples: sharks, skates, rays

  5. Shark: Placoid Scales

  6. Skate: Placoid Scales

  7. Ray: Placoid Scales

  8. 4 Types of Scales • 2. Ganoid: rhombus shape, connected by peg and socket joints • Do not grow with fish, new ones are added • Examples: Gar, Paddlefish, Sturgeon

  9. Longnose Gar: Ganoid Scales Gar

  10. Sturgeon: Ganoid Scales

  11. Paddlefish: Ganoid Scales

  12. 4 Types of Scales • 3. Ctenoid: overlapping, allow great maneuverability as fish bends • Grows with fish, found in spiny rayed fish

  13. Ctenoid Scales

  14. 4 Types of Scales • 4. Cycloid: same as ctenoid functions • Smooth margin, soft-rayed fish • Grows with fish

  15. Cycloid Scales: Catfish

  16. REVIEW • Complete back of note sheet • Give different fish examples for the top 2 • 2 minutes!!!! GO!!!

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