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

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Presentation transcript:

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  Hard, sometimes colorful, overlapping plates  Provides protection from predators and disease/ infection

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

Shark: Placoid Scales

Skate: Placoid Scales

Ray: Placoid Scales

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

Longnose Gar: Ganoid Scales Gar

Sturgeon: Ganoid Scales

Paddlefish: Ganoid Scales

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

Ctenoid Scales

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

Cycloid Scales: Catfish

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