Fish Anatomy

Question 1

What are the age-classes of fish?

Answer 1

Egg
Fry
Fingerling
Food fish
Brood fish

Question 2

What is a fry?

Answer 2

After the egg hatches, the fish leaves, but they may till have the yolk sac acttached

Question 3

What is a fingerling?

Answer 3

Fish that are 2-6 inches long

They are anatomically matured, but internal reproductive organs may not be fully matured

Question 4

What is the lateral line?

Answer 4

It allows fish to sense things
Important for schooling and defense
Indicates the vertebral column
Landmark for drawing blood

Question 5

What do scales derive from?

Answer 5

Dermis

Question 6

Describe the kidneys

Answer 6

Anterior kidney is primarily hematopoeitic

Posterior has glomeruli and tubules

Question 7

What is the swim bladder an extension of?

Answer 7

GI tract

Question 8

What is the swim bladder used for?

Answer 8

Buoyancy

Question 9

What is the physostomous?

Answer 9

An opening between the GI tact and the swim bladder

Question 10

What are gills responsible for?

Answer 10

Oxygen acquisition
Getting rid of waste products
Nitrogenous waste removal

Question 11

How many chambers are in the heart?

Answer 11

2, atrium and ventricle

Question 12

Describe the single loop system

Answer 12

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

Question 13

How is blood pumped out towards the gills?

Answer 13

Conus arteriosus

Question 14

Where is the highest blood pressure in the fish?

Answer 14

The highest blood pressure comes out of the ventricle and blood goes straight to the gills

Question 15

Are freshwater fish hypertonic or hypotonic to their environement?

Answer 15

Hypertonic, there’s more salt in the fish than in the water

Question 16

Describe the osmoregulation of water in freshwater species versus marine species

Answer 16

Freshwater:
Constant influx
No conservation

Marine:
Constant loss
Conservation

Question 17

Describe the osmoregulation of urine in freshwater species versus marine species

Answer 17

Freshwater:
Large volume
Dilute

Marine:
Limited volume
Concentrated

Question 18

What is the nitrogenous waster in fish?

Answer 18

Ammonia

Question 19

Why do marine fish constantly take in water?

Answer 19

Their chloride cells constantly pump out trying to get rid of salt

Question 20

What is unique about anadromous fish?

Answer 20

They can alter what their chloride cells do
In fresh water, they can retain chloride cells
In salt water, they release chloride cells

Question 21

Where does gaseous exchange occur?

Answer 21

At the level of the secondary lamellae

Question 22

Where does water meet the blood of the fish?

Answer 22

Where it is highest in oxygen

Question 23

What is the role of the kidney?

Answer 23

Urine formation/osmoregulation

Hematopoeisis