Internal Anatomy of Fish

Cell

Tissue

Organ

Organ System

Organism

Smooth Muscle CellSmooth

Muscle Cell

Tissue

Fish Digestive System

Stomach

Fish

Organization of Life

Integumentary System

• Skin

• Most general function is protection and coloration

Parts of the Integumentary System

• Epidermis– Constantly regenerating

• Mucus Layer– Helps slide through water– Rids fish of parasites

• Scales– Give fish their color– Can help you determine age

Skeletal System

• Class Osteichthyes: Bones & Cartilage

• Class Chondricthyes: Cartilage

• General function is support and movement

• Also protects inner organs

Muscular System

• General function is movement

• 3 types of muscles– Skeletal

• Moving on purpose• Voluntary

– Smooth• Controls inner organs• Involuntary

– Cardiac• Move blood• Involuntary

Digestive System

• General function is to process food and use for nutrients/energy.

• Mouth

• Esophagus

• Digestive Tube

• Digestive Glands (make enzymes or store them)– Liver, pancreas, gall bladder

• Anus

Respiratory System

• General Function is oxygen and carbon dioxide exchange

Gills–Gill raker keeps food from leaving mouth through gills–Gill filaments is where gas exchange occurs

Gas bladder–Fills with air to keep fish buoyant

Circulatory System

• General function is to transport body fluids

• Heart– 1st place blood is pumped is to the gills

• Arteries (Away from heart)

• Capillaries (Gas and nutrient exchange)

• Veins (Toward heart)

Excretory System

• General function is to remove waste from blood

• Uses kidneys

Reproductive System

• General function is to perpetuate the species

Nervous System

• General function is sensing, coordination of movements, and response to stimuli.– Composed of brain, nerves, lateral line, eyes,

ears, and nose

Fish Brain!1. Olfactory Lobes (smelling)

2. Cerebrum (smelling and other senses)

3. Optic Lobes (sight, sound, and lateral line senses)

4. Cerebellum (muscle coordination)

5. Spinal Cord (connects all muscles and nerves to the brain)

Endocrine System

• General function is chemical regulation of hormones.

• Hormones can:– Control rate of growth– Control development of sex

characteristics– Control capacity to respond

to light and stress