Perch Lab

Question 1

The yellow perch, Perca flavescens, represents the _____fishes.

Answer 1

actinopterygian (ray-finned)

Question 2

Where are yellow perch found?

Answer 2

North America

Question 3

What kind of scales do perch have?

Answer 3

Ctenoid (comb-like)

Question 4

What are some external differences between dogfish and perch?

Answer 4

• Dogfish have denticles/placoid scales, perch have ctenoid scales
• Paired fins are placed differently
• Homocercal tail in perch
• Single opening covered by operculum in perch, instead of multiple gill openings

Question 5

When do the growth rings on scales grow more slowly?

Answer 5

Colder months

They show up as more condensed bands

Question 6

Do perch have eyelids?

Answer 6

No, but a transparent membrane protects the eye

Question 7

What kind of skeleton does the perch have?

Answer 7

Bony

Question 8

____ support the fins of perch.

Answer 8

Fin rays

Question 9

The dorsal ribs point___ and the ventral ribs point ___

Answer 9

out

down

Question 10

How many chambers in a perch heart?

Answer 10

four

Question 11

What are the four chambers of the perch heart, in the order of blood flow?

Answer 11

1. sinus venosus
2. atrium
3. ventricle
4. bulbus arteriosus

Question 12

What is a systemic circulatory system?

Answer 12

One loop, like in the perch

Question 13

What does the perch’s gas bladder do?

Answer 13

exchanges air through the circulatory system to control buoyancy

Question 14

What do other fish use their gas bladders for?

Answer 14

As a type of lung

Question 15

Do perch have a pneumatic duct?

Answer 15

No

Question 16

Physostomous vs. Physoclistous

Answer 16

Physostomous: have a pneumatic duct
Physoclistous: don’t

Question 17

___ prevent food from obstructing the gills.

Answer 17

gill rakers

Question 18

Where are the perch’s teeth?

Answer 18

• palatal teeth (roof of mouth)
• marginal teeth (upper and lower jaws)
• pharyngeal teeth (upper, lower, rear of pharynx)

Question 19

What does the pylorus do?

Answer 19

prevents the premature movement of food out of the stomach into the small intestine

Question 20

Does the perch have a distinct pancreas?

Answer 20

No, it is diffuse

Question 21

What does the pancreas do?

Answer 21

• exocrine secretion of digestive enzymes into the intestine

- endocrine secretion of the hormones insulin and glucagon

Question 22

What kind of waste does the perch produce?

Answer 22

ammonium and ammonia (they are ammonioteles)

Question 23

Urine reaches the perch’s urinary bladder from the __ via ___.

Answer 23

kidneys

archinephric ducts

Question 24

Does the perch live in freshwater?

Answer 24

Yes

Question 25

Does the perch produce much urine?

Answer 25

Yes, lots of dilute urine, but it does also excretes some ammonia through the gills

Question 26

Do saltwater fish have dilute urine?

Answer 26

No, they have very concentrated urine, and most of their ion, water, and waste exchange is across the gills

Question 27

When do yellow perch spawn?

Answer 27

Yearly in the spring

Question 28

What kind of fertilization in perch?

Answer 28

External
Male fertilizes eggs after the female lays them
Fertilization is random

Question 29

Do perch exhibit parental care?

Answer 29

No

Question 30

How long do perch live?

Answer 30

About 10 years

Question 31

Are perch semelparous?

Answer 31

No, they are iteroparous (reproduce more than once), unlike lamprey

Question 32

Male perch have __ testes. The testicular ducts __.

Answer 32

two

connect

Question 33

Female perch have __ ovary/ovaries. The size fluctuates, peaking when___.

Answer 33

one

eggs are mature

Question 34

When are perch sexually mature?

Answer 34

Females- 3 or 4

Males- 2 or 3