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Fish. Classification. Kingdom- Animalia Phylum- Chordata Sub Phylum- Vertebrata Classes- Agnatha, Chondrichthyes, Osteichthyes. Let’s go to the Video!. Agnatha. Jawless fish: Lampreys, Hagfish. Types of Agnathans. Hagfish - Ocean scavengers, not much is known about them.

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classification
Classification
  • Kingdom- Animalia
  • Phylum- Chordata
  • Sub Phylum- Vertebrata
  • Classes- Agnatha, Chondrichthyes, Osteichthyes
agnatha
Agnatha

Jawless fish: Lampreys, Hagfish

types of agnathans
Types of Agnathans
  • Hagfish- Ocean scavengers, not much is known about them.
  • Lamprey- fresh and salt water, they are parasitic and prey on other fish.

* Both have cartilagenous skeletons and sucker-like mouths.

chondricthyes
Chondricthyes

Cartilagenous Fish: Shark, Ray

chondrichthyes
Chondrichthyes
  • Sharks are adapted for a predatory lifestyle.
  • Cartilage skeletons, stiff pectoral fins (speed).
  • No operculum, must keep moving to breathe.
  • Have live births.
  • Special scales feel like sandpaper.
  • Manta, and Sting Rays- live in shallow water, have mouths located on the underside, are fairly docile, wide flat bodies and wing-like fins that are flexible.
types of chondrichthyes
Types of Chondrichthyes
  • Sharks andRays- have no operculum and must keep moving to breathe.
  • Have different kinds of scales that feel and look more like sandpaper.
  • Have skeletons made of cartilage not bones.
osteichthyes
Osteichthyes

Bony Fish: Salmon, Carp, Tuna

Over 20,000 different species

types of osteichthyes
Types of Osteichthyes

Ray Finned:

  • Most fish are this type
  • Fins are supported by bony structures called Rays.
  • Teleosts are the most advanced form of ray finned fish (symmetrical tails and mobile fins).

Lobe Finned:

  • Fins are long, fleshy, muscular, supported by central core of bones.
  • Thought to be ancestors of amphibians.
  • Examples are: Coelacanth, Lungfish
fish characteristics
Fish Characteristics
  • Gills
  • Backbone (vertebrae)
  • Paired Fins
  • Single Loop Circulation
  • Two chambered heart
fish respiration
Fish Respiration
  • Water flows over Gills as fish opens mouth and swims.
  • Water flows opposite direction of blood flow.
  • O2 diffuses from the water into the blood.
  • Gills are made of thousands of gill filaments.
  • Gills are covered by the Operculum.
fish circulation
Fish Circulation
  • Fish heart has 2 chambers
  • Single loop circulation
  • Blood flows into gills, picks up O2, goes to the body, returns to the heart.
fish reproduction
Fish Reproduction
  • Most Fish reproduce sexually, and fertilize their eggs externally (Sharks-internally).
  • Spawning is the process of fertilizing eggs.
  • Baby fish are called FRY.
fish adaptations
Fish Adaptations
  • Lateral Line System- used to detect vibrations, orient the fish in water, it is a line of cells running down the side of the fish.
  • Operculum- gill cover, movement of operculum allows more water to be drawn in.
  • Swim Bladder- a gas filled sac that helps the fish maintain buoyancy. Sharks don’t have a swim bladder!
  • Fins- Dorsal, Caudal, Pectoral, Pelvic, Anal.
adaptations
Adaptations

Air Bladder Operculum Lateral

Gills Line

Fins

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