1. Image from: http://www.chm.bris.ac.uk/motm/trimethylamine/fish.gif
Fish Dissection
Image from:

2. There are over 30,000 species of fish

3. Images from:

4. Ray-finned have spines in fins (no bones) Lobe-finned
Have short stubby limbs;
bones in fins
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5. Lobe fin fish Coelocanth Australian lung fish

6. RAYS- Thin spines in fins

7. LOBE FINNED FISH are believed to be ancestors to amphibians

8. Scientists believe other vertebrates evolved from BONY LOBE-FINNED fish

9. BONY FISH
CHARACTERISTICS
Endoskeleton of bone Scales & fins
Lungs or swim bladder

10. ENDOSKELETON

11. FISH ANIMALIA CHORDATA VERTEBRATA “backbone” OSTEICHTHYES “bony fish”
LATIN meaning
KINGDOM _____________
PHYLUM ____________________________
SUBPHYLUM ___________________________
CLASS _______________________________
ANIMALIA
CHORDATA
VERTEBRATA “backbone”
OSTEICHTHYES “bony fish”

12. DORSAL
POSTERIOR
ANTERIOR
VENTRAL
CEPHALIZATION
BILATERAL SYMMETRY

13. Integumentary Scales- decrease water resistance
protection growth rings increase with age

14. Coloration-darker on top/lighter on bottom
Body Shape-streamlined
RAYS- protection from predators

15. OPERCULUM
Water goes in through mouth out through slit behind operculum

16. Nostrils-dead end pockets
smell-important
Eye-no eyelid
Mouth-teeth don’t chew
Ears- not external

17. Anterior Dorsal
Posterior Dorsal
Pectoral
Caudal
Anal
Pelvic

18. LATERAL LINE Senses vibrations & water pressure
Senses vibrations & water pressure

19. ANUS exit for digestive waste
UROGENITAL OPENING (PORE) exit for urine & eggs or sperm

20. INTERNAL STRUCTURES

21. RESPIRATORY
Gill Arch
Gill Filaments

22. GAS EXCHANGE IN GILLS

23. FUNCTIONS OF GILLS Gas exchange Excrete Nitrogen waste as ammonia
OSMOREGULATION regulate ion/water balance

24. Image from: http://www. agriteach. com/lessonfiles/sample/perchdissect

25. Image by Riedell/Vanderwal©2005
OVARY-makes eggs

26. Image by Riedell/Vanderwal©2005
TESTES-make sperm

27. REPRODUCTION MOST FISH HAVE: EXTERNAL FERTILIZATION DIRECT DEVELOPMENT
BABY FISH = fry

28. SWIM BLADDER controls buoyancy
Image by Riedell/Vanderwal©2005

29. LIVER
& improved digestive gland
Image by Riedell/Vanderwal©2005

30. LIVER (improved digestive gland)
Makes bile used by intestine Stores glycogen
Stores vitamins (especially oil soluble ones- A & D)
Processes TOXINS for removal by excretory system (including nitrogen waste made by cells)
GALL BLADDER
Stores bile made by liver

31. DIGESTIVE SYSTEM
Diagram by Riedell/Vanderwal©2005

32. STOMACH
Cardiac & Pyloric
Image by Riedell/Vanderwal©2005

33. STOMACH Add acid and digestive juices Starts digestion
Grind and mash food

34. INTESTINE 1. First section receives bile from liver (called DUODENUM)
2. Finishes digestion
3. Absorbs nutrients
4. Collect and remove digestive waste
Finger-like extensions inside (VILLI) increase surface area for greater absorption of nutrients

35. INTESTINE

36. PYLORIC CAECA
Contain microorganisms (bacteria) to break down plant material
Image by Riedell/Vanderwal©2005

37. DUODENUM Receives bile from liver Image by Riedell/Vanderwal©2005

38. HEART Atrium receives blood from Sinus venosus
Ventricle – pumping chamber
Conus arteriosus-smoothes flow of blood out of heart

39. SPLEEN- Produces new RBC’s Processes & destroys old worn out RBC’s
Stores RBC’s for release when needed
Image by Riedell/Vanderwal©2005

40. KIDNEY Collects and removes nitrogen waste (ammonia)
Osmoregulation –maintain water/ion balance
Image by Riedell/Vanderwal©2005

41. URINARY BLADDER Stores urine made by kidneys
SWIM (Air) BLADDER Receives gases from bloodstream Controls buoyancy
GALL BLADDER Stores bile made by liver

42. UROGENITAL PORE shared by excretory & reproductive systems
Diagram by Riedell
ANUS – for digestive waste

43. BRAIN
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