Presentations Pt. 7

Question 1

Magadi tilapia are 100% ureagenic T/F Explain.

Answer 1

T - only secrete urea

Question 2

Which answer is not correct about the characteristics of Lake Magadi?
A. It has a pH around 10.
B. The oxygen saturation can range from 0-300%
C. High in acidic solutes
D. High in alkaline solutes
E. The temperature fluctuates based on the time of day.

Answer 2

C

Question 3

What physiological advantage does the T-shaped stomach structure in Magadi tilapia have in comparison to other gut structures in other fish species?

Answer 3

• prevents alkaline water from mixing with stomach acids to maintain pH balance

Question 4

What are the two most common types of estuaries?
A. Riverine and lagoon
B. Lagoon and oceanic
C. Riverine and bar-built
D. Barrier and oceanic
E. Bar-built and tectonic

Answer 4

C

Question 5

What are the names of the cells located in the gill tissue of estuarine fish that are responsible for osmoregulation?
A. Lymphocytes
B. Granulocytes
C. Macrophages
D. Ionocytes
E. Neutrophils

Answer 5

D

Question 6

Estuarine fish contain two main physiological adaptations to be able to live in both freshwater and saltwater. What two major organs contain these adaptations?
A. Gills, Kidneys
B. Lungs, Gills
C. Stomach, Kidneys
D. Kidneys, Skin
E. Skin, Stomach

Answer 6

A

Question 7

In deep sea fishes, what is disadvantage of aphakic gaps in the eye?

Answer 7

It is at the area of highest sensitivity?
- ADVANTAGE - enlarge binocular field of vision

Question 8

How do deep sea lantern fish use bioluminescence for camouflage?

Answer 8

• light emitted on ventral size, matching colour and intensity of higher light to ide their silhouette

Question 9

What is the advantage of the yellow pigment adaptation in the eyes of deep sea fishes?

Answer 9

• improves detection of bioluminescence signals (potential mate, break counter illumination camouflages

Question 10

In contrast to cavefish, surface fish have greater body fat compositions. T/F Explain.

Answer 10

F - cave fish have greater body fat composition

Question 11

Cave fishes have functional eyes but can’t open them. T/F Explain.

Answer 11

F - lose eyes if not used because they are a waste of energy

Question 12

How do blind cavefish navigate without sight?

Answer 12

• lateral line system with enhanced neuromasts