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Fish. Classification. Kingdom- Animalia Phylum- Chordata Sub Phylum- Vertebrata Classes- Agnatha, Chondrichthyes, Osteichthyes. 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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