1 / 15

Hagfish

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 L ack jaws : within mouth are 2 movable plates & a rough tonguelike structure that it uses to pinch off chunks of flesh.

arne
Download Presentation

Hagfish

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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 • http://www.youtube.com/watch?v=pmaal7Hf0WA

  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 • http://www.youtube.com/watch?v=eqoT8tcZq6k • http://www.youtube.com/watch?v=iWtt-BUCaJg • http://www.youtube.com/watch?v=CscE2XyrBFU&feature=fvsr • http://www.youtube.com/watch?v=nQJFoA_6mJQ&feature=related 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 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 • 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

  9. Chondrichthyes • http://www.youtube.com/watch?v=z3LnYqtjlVQ&feature=related sharks • http://www.youtube.com/watch?v=NNG5l1K9jLk&feature=related

  10. SUPERClassOsteichthyes • 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.

  11. 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

  12. 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

  13. 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

More Related