1. Hagfish Bottom dwellers in cold marine waters
Unique: they don’t have vertebrae
Unique: their body fluids have nearly the same ion concentration as sea water
Lack jaws : within mouth are 2 movable plates & a rough tonguelike structure that it uses to pinch off chunks of flesh
often burrow into the body of a dead fish thru gills, skin, or anus
once inside, they eat the internal organs

2. Hagfish http://www.youtube.com/watch?v=bqk0mnMgwUQ

3. Lampreys Class Cephalaspidomorphi *3-17 years
Found along Atlantic Coast of Europe & North America , western Mediterranean Sea, & Great Lakes
About half of the species are free-living (non-parasitic)
Other half are parasites as adults & feed on the blood/body fluids of other fishes
SEE

4. Lamprey finds a suitable host & uses its disk-shaped mouth to attach
Scrapes a hole in the host with its rough tongue & secretes a chemical that keeps the host’s blood from clotting
After feeding, the lamprey drops off
Host may recover, bleed to death, or die from infection

5. Lampreys http://www.youtube.com/watch?v=x-KJZ22-wTQ
LONG

6. CLASS CHONDRICHTHYES
Cartilaginous fishes because of cartilage skeleton
Sharks, rays, & skates
Cartilage- flexible, lightweight material made of cells surrounded by tough fibers of protein
Notochord of juveniles turns to cartilage in adults
Tough skin is covered with dermal denticles (placoid scales)-makes them feel like sandpaper
Breathe thru 5-7 gills
Sharks and rays reproduce by passing sperm from male to female, male using modified fins called claspers
Some species produce large egg cases while others produce live young

7. shark ray skate

8. Ray
Skate
give birth to live young (via ovoviviparity)
pelvic fin with 1 lobe
tail relatively slender to whip-like, usually with a saw-edged stinging spine midway along its length
**BIGGEST DIFFERENCE IS IN BREEDING
Skates give birth to young in eggcases – sometimes called mermaid’s purses (via oviparity)
each pelvic fin divided into 2 lobes
tail relatively stocky, without a stinging spine

10. Chondrichthyes
sharks

11. SUPERClass Osteichthyes
Of 25,000 fish species, about 95% are bony fishes
Group accounts for most of the vertebrates living in aquatic environment
EXAMPLES: lungfishes, coelacanth, trout, salmon, perch, guppies, bass, herring, goldfish, eels, etc.

12. 3 characteristics of bony fish
BONE: Material is typically harder and heavier than cartilage
LUNG or SWIM BLADDER: early bony fishes had lungs (internal respiratory organs in which gas is exchanged b/w air and blood
- today most bony fishes have a swim bladder that controls buoyancy
SCALES: protect the fish & reduce friction when swimming

13. 2 main groups of bony fishes
Class Sarcopterygii: lobe-finned fishes
Have fleshy fins supported by a series of bones
2 groups exist today
6 species of coelocanths & 1 species of lungfish
Lungfishes live in shallow tropical ponds that periodically dry up
Coelocanths live deep in the ocean
Coelocanth lungfish

14. Ray-finned Fishes Class Actinopterygii
Contain majority of species of fish (96% of 25,000 species)
Divided into 46 orders
They have an upper jaw that consists of 2 bones & fins with bony spines (which differ from those with lobed-fins)
Inhabit a wide range of habitats..salt & freshwater…shallow to great depths

15. Draw bony fish & label in your notes