Phylum Chordata Fish amphibians reptiles birds mammals Vertebrates
Phylum Chordata Fish, amphibians, reptiles, birds & mammals Vertebrates: Internal skeletons Animals which have a spinal cord protected by a backbone
FISH Live in water Gills for gas exchange Fins for locomotion Skeleton made of cartilage or bone Most are covered by scales Cold-blooded – body temp. depends environment on
3 classes of fish 1. Jawless fish - agnatha Oldest group – very primitive Scale-less skin Some Parasitic / some filter feed Circular mouth with fleshy teeth Cartilaginous skeleton
Hagfish & lamprey Circular mouth Gill slits
3 classes of fish 2. cartilaginous fish= chondrichthyes Skeleton made of cartilage (skates, rays, sharks) All are predatory except 4 species!
The 4 exceptions are filter feeders Whale sharks – warm shallow water THE LARGEST FISH IN THE SEA!!!
The 4 exceptions are filter feeders Basking sharks – cold shallow water THE SECOND LARGEST FISH IN THE SEA!!!
The 4 exceptions are filter feeders megamouth shark – cold deep water
The 4 exceptions are filter feeders manta ray– shallow warm water
3 classes of fish 3. bony fish - osteichthyes Skeleton of bone Most numerous of fish species Greatest diversity in shape and feeding habits
Body parts of fish Get ready to draw a fish!!!
1. Caudal fin - tail fin Used forward motion and acceleration
2. Dorsal fin 3. Anal fin & Singular fins Used to prevent rolling/tipping
4. pectoral fin pelvic fin & paired fins (left & right) 5. Used to balance, stop & turn
6. Spines Used for protection Some contain poison sacs
7. operculum Covers & protects gills Not found in sharks
8. Lateral line Sensory canals used to detect changes in water pressure around the fish (similar to human ear)
Bony Fish: Perch Dissection Kahoot Review! Vs. Cartilage Fish: Dogfish (shark) Dissection
COMPARISON OF CARTILAGINOUS & BONY FISHES TRAIT EXAMPLES SKELETON SWIM BLADDER CARTILAGINOUS BONY_____ SHARKS, RAYS, SKATES TUNA, COD, SALMON, CARTILAGE BONE ABSENT – OILY LIVER PROVIDES BUOYANCY PRESENT – AIR FILLED FOR BUOYANCY
COMPARISON OF CARTILAGINOUS & BONY FISHES TRAIT FERTILIZATION SCALES CARTILAGINOUS BONY_____ INTERNAL – HAVE FEW LARGE YOUNG IN LIFE TIME PLACOID – SPINY EMBEDDED IN SKIN EXTERNAL – LAY MILLIONS OF SMALL EGGS GANOID – PLATELIKE CTENOID & CYCLOID ARE FLAT, FLEXIBLE, OVERLAP
COMPARISON OF CARTILAGINOUS & BONY FISHES TRAIT CARTILAGINOUS BONY_____ GILLS NO OPERCULUM HAVE GILLS SLITS HAVE OPERCULUM COVER & PROTECT GILLS FEEDING BEHAVIOR ALL PREDATORS FOUR EXCEPTIONS GREAT VARIATION IN FOOD SOURCES FINS RIGID AND UNSEGMENTED FLEXIBLE AND SEGMENTED TEETH NOT FUSED TO JAW REPLACEABLE FUSED TO JAW IRREPLACEABLE
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