NATIONAL OPEN UNIVERSITY OF NIGERIA

UNIVERSITY VILLAGE, PLOT 91, CASDASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI, ABUJA.
FACULTY OF SCIENCES
JANUARY/FEBRUARY 2018 EXAMINATION

COURSE CODE: BIO 410  

Course Title: Fisheries and Aquaculture (3 units)

TIME ALLOWED: 2½HOURS

Instruction: Question 1 is compulsory and any other FOUR questions.

1a.Draw the clear structure of a bony fish identifying at least 10 of the external features.(8marks)

b. Describe the process of gas exchange in typical bony fish (6marks)

c. .List any 3 qualities of Good water for fish pond management (3marks)

d. List the first 5 steps involved in fish drying (5marks)

2. Write short notes on the body shapes of the following fish species

1. Barracuda (4Marks)
2. Flounder ( 4 marks)
3. Eel (4marks)

3. Write short notes on the following basic organs/systems in fish

1. Corpuscles of Stannius (3marks)
2. Ultimobranchial Gland (3marks)
3. Pineal Gland (3marks)
4. Lateral line systems (3marks)

4. Explain how the following factors affect the feeding habit of fishes (12 marks)

a. Size

b. Temperature

c. Competition

d. Preference/Selectivity

5. Discuss the following groups of fishes (12marks)

a . Planktivores    (4marks)   

b. Predators (4marks)

c. Herbivores (2 marks)

d. Omnivores (2 marks)

6. a Explain the term ‘Fecundity” (6 marks)

b. Describe the gravimetric method of fecundity determination (4 marks)

c. List two types of constraints to fecundity(2 marks)