Fish Anatomy Flashcards
What are the age-classes of fish?
Egg Fry Fingerling Food fish Brood fish
What is a fry?
After the egg hatches, the fish leaves, but they may till have the yolk sac acttached
What is a fingerling?
Fish that are 2-6 inches long
They are anatomically matured, but internal reproductive organs may not be fully matured
What is the lateral line?
It allows fish to sense things
Important for schooling and defense
Indicates the vertebral column
Landmark for drawing blood
What do scales derive from?
Dermis
Describe the kidneys
Anterior kidney is primarily hematopoeitic
Posterior has glomeruli and tubules
What is the swim bladder an extension of?
GI tract
What is the swim bladder used for?
Buoyancy
What is the physostomous?
An opening between the GI tact and the swim bladder
What are gills responsible for?
Oxygen acquisition
Getting rid of waste products
Nitrogenous waste removal
How many chambers are in the heart?
2, atrium and ventricle
Describe the single loop system
The blood enters the heart through the vena cava and exits the heart deoxygenated. Goes to the gills, becomes oxygenated, circulates through the body and returns to the heart
How is blood pumped out towards the gills?
Conus arteriosus
Where is the highest blood pressure in the fish?
The highest blood pressure comes out of the ventricle and blood goes straight to the gills
Are freshwater fish hypertonic or hypotonic to their environement?
Hypertonic, there’s more salt in the fish than in the water
Describe the osmoregulation of water in freshwater species versus marine species
Freshwater:
Constant influx
No conservation
Marine:
Constant loss
Conservation
Describe the osmoregulation of urine in freshwater species versus marine species
Freshwater:
Large volume
Dilute
Marine:
Limited volume
Concentrated
What is the nitrogenous waster in fish?
Ammonia
Why do marine fish constantly take in water?
Their chloride cells constantly pump out trying to get rid of salt
What is unique about anadromous fish?
They can alter what their chloride cells do
In fresh water, they can retain chloride cells
In salt water, they release chloride cells
Where does gaseous exchange occur?
At the level of the secondary lamellae
Where does water meet the blood of the fish?
Where it is highest in oxygen
What is the role of the kidney?
Urine formation/osmoregulation
Hematopoeisis
