1. INTRODUCTION TO FISHES PART 1 Fisheries

2. Introduction to Fishes What is a fish?  A limbless cold-blooded vertebrate animal with gills and fins and living wholly in water.

4. Introduction to Fishes Fish are vertebrates. Cold-blooded.  Their temperature varies with that of their surroundings. Most reproduce by laying eggs.  Fertilized externally.

5. Body Types Six main body types

6. Body Types  Flat (rays, skates, flounder, sole)

7. Body Types  Fusiform (sharks, salmon, barracuda, tuna)

9. Body Types  Elongated (ells, lamprey, needlefish)

10. Body Types  Compressed (butterfly fish, angelfish)

11. Body Types  Round (porcupine fish)

12. Body Types  Ribbon (cutlass)

14. Scales Point away from the head (towards tail fin). Ctenoid – jagged edges. Cycloid – smooth, round edges.

16. Lateral Line This organ lays is a series of fluid-filled ducts located just beneath the scales. Picks up vibrations in the water for:  Detecting predators  Finding food  Navigation

17. Fins Used for movement, stability, steering, nest building, and spawning.

18. Fins Caudal Fin:  For propulsion.  Fast swimmers have a forked caudal fin. Dorsal Fin:  For stability. Anal Fin:  For stability. Pectoral Fins:  For manoeuvring (steer and brake).