fish anatomy — internal

Question 1

heart

Answer 1

• pumps blood
• delivers oxygen/digested nutrition to cells of organs

(2-chambered)

Question 2

liver

Answer 2

• produces bile
• digests and filters toxins

Question 3

pyloric caeca

Answer 3

• breaks down food
• absorbs nutrients

(thought function is not well known)

Question 4

gonads

Answer 4

sex organs

MALE = paired testes (produce sperm)
FEMALE = paired ovaries (produce eggs)

(fertilisation is performed externally and is called SPAWNING)

Question 5

stomach

Answer 5

• digests food
• absorbs nutrients

CARNIVORES = short intestines (food is easy to chemically break down/absorb)
HERBIVORES = long intestines
(plants are harder to break down)

Question 6

kidneys

Answer 6

• filters liquid waste from blood
• regulates water / salt concentrations (in the body)

(that allows fish to exist in fresh-/saltwater)

Question 7

swim bladder

Answer 7

• controls the fish’s buoyancy

fish NEED it to help them stay AFLOAT when swimming

PHYSOSTOMOUS = shallow waters
PHYSOCLISTOUS = deeper waters

Question 8

physiclistous

Answer 8

PHYSOCLISTOUS = deeper waters

• completely closed off from the swim bladder (able to control the gas of the swim bladder)

Question 9

physostomous

Answer 9

PHYSOSTOMOUS = shallow waters

1. fish expels bubbles as they swim to the surface
2. fish then swallow air at the surface
3. air is then passed into the guts