Fish

Classification

• Kingdom- Animalia

• Phylum- Chordata

• Sub Phylum- Vertebrata

• Classes- Agnatha, Chondrichthyes, Osteichthyes

Osteichthyes

Bony Fish: Salmon, Carp, Tuna

Over 20,000 different species

Types of Osteichthyes

Ray Finned:

– Most fish are this type

– Fins are supported by bony structures called Rays.

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

• Gills

• Backbone (vertebrae)

• Paired Fins

• Single Loop Circulation

• Two chambered heart

Fish Anatomy

Fins

Different Dorsal Fins

Fish Respiration

• Water flows over Gills as fish

opens mouth and swims.

• O2 diffuses from the water into

the blood.

• Gills are made of thousands of

gill filaments.

• Gills are covered by the

Operculum.

Up Close and Personal

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• Most fish reproduce sexually, and fertilize their

eggs externally.

• Spawning is the process of fertilizing eggs.

• Baby fish are called FRY.

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

Air Bladder Operculum Lateral

Gills Line

Fins

Bony fish have a bony opeculum

Cartilaginous fish have gill slits

kmle.co.kr

• 1st Dorsal Fin

• 2nd Dorsal Fin

• Anal Fin

• Caudal Fin

• Eye

• Lateral Line

• Mouth

• Nostril

• Operculum

• Pectoral Fin

• Pelvic Fin

• 1st Dorsal Fin

• 2nd Dorsal Fin

• Anal Fin

• Caudal Fin

• Eye

• Lateral Line

• Mouth

• Nostril

• Operculum

• Pectoral Fin

• Pelvic Fin