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General Classification - PowerPoint PPT Presentation


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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
General Classification
  • Spiny-rayed fish
  • Hard, sometimes sharp spines in dorsal fin
  • Ex. Yellow Perch
general classification1
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
Fish Adaptations: Scales
  • Hard, sometimes colorful, overlapping plates
  • Provides protection from predators and disease/ infection
4 types of scales
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
4 types of scales1
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
4 types of scales2
4 Types of Scales
  • 3. Ctenoid: overlapping, allow great maneuverability as fish bends
  • Grows with fish, found in spiny rayed fish
4 types of scales3
4 Types of Scales
  • 4. Cycloid: same as ctenoid functions
  • Smooth margin, soft-rayed fish
  • Grows with fish
review
REVIEW
  • Complete back of note sheet
  • Give different fish examples for the top 2
  • 2 minutes!!!! GO!!!