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Freshwater Fish
Internal Organs
Mr. Berry
Internal Anatomy
http://myfwc.com/Fishing/Fishes/an
atomy.html#internal
You will be responsible for:
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Muscle
Kidney
Pyloric Caeca
Spine
Spinal Cord
Swim Bladder
Stomach
Intestines
Heart
Liver
Vent
For the Test
• Correctly label all
internal parts
• Be able to explain the
function of each part
http://myfwc.com/Fishing/Fishe
s/panfish.html
Muscle
• Provides movement
• This portion is usually
consumed as the fillet
Kidney
• Filters waste
materials from the
blood
• Regulates water and
salt concentrations in
the body
Pyloric Caeca
• Secretes enzymes
that help digest food
• Is Identified by it’s
finger-like projections
next to the stomach
Spinal Cord
• Connects brain to rest
of body
• Relays information
from the brain to the
rest of the body
Spine
• Primary backbone of
the fish
• Made up of vertebrae
that protect the spinal
cord
Swim Bladder
• An air filled organ
• Allows fish to
suspend neutrally in
the water
• Conserves energy
instead of constant
swimming
Liver
• Very Important Organ
• Secretes enzymes to
aid in digestion
• Stores fats and
carbohydrates
• Moderates the blood
chemistry (nitrogen
excretion)
Review:
• Be able to label all internal body parts and
organs listed.
• Know function or key role played by each
body part as listed in this lecture.
• Know those and you will do great!
Vent
• Site of waste
elimination from the
body
Heart
• Circulates blood
throughout the body
• Oxygen and digested
nutrients are
delivered to cells
throughout the body
by the circulated
blood
Stomach and Intestines
• Digest food
• Absorbs nutrients
• Carnivorous fish have
shorter intestines than
herbivores because
plants are harder to
digest.
• The longer intestine
allows for more time and
area to absorb nutrients