Marine Aquaculture Exam 1

June 19, 2001

 

Name: _____________________

 

Group: ______________________________

 

 

1.      What is minimum dissolved oxygen concentration considered acceptable for growth of fish?

 

______________5_______________ mg/L

 

2.      What is the effect of increased elevation on the solubility of oxygen?

 

A.  Increases solubility        ■ Decreases solubility        C. Does not affect solubility

 

3.      What is the effect of decreasing salinity on the solubility of oxygen?

 

■  Increases solubility        B.  Decreases solubility          C.  Does not affect solubility

4.      With salinity and elevation held constant a liter of water will have a higher concentration of oxygen at which temperature?

■  10oC                 B. 20oC            C. 30oC

5.      Dissolved nitrogen gas poses a potential supersaturation problem at what percent saturation?

 

A. 90% saturation     B. 100% saturation   ■ 110% saturation   D. 180% saturation

6.      Which form of ammonia is toxic to fish?

A.  Ionized (NH4+)             ■ Un-ionized (NH3)

 

7.      What is the chronic toxicity level of the toxic form of ammonia for finfish?

 

A. 0.02 mg/L          B. 0.04 mg/L        ■ 0.06 mg/L        C. 0.08 mg/L       D. 1.0 mg/L

8.      Complete the following outline of the nitrification process.

 

a. Ammonia                        b. Nitrosomonas

 

c. Nitrobacter                     d. Nitrate

 

 

Choices:          1. Nitrobacter sp.

2. Nitrate
3. Nitrosomonas sp.

4. Ammonia

 

9.      What is the effect of decreasing temperature on the ionization of ammonia?

 

 ■ Increases ionization       B. Decreases ionization             C. Does not affect ionization

10.  What is the effect of increasing pH on the ionization of ammonia?

 

A.  Increases ionization       ■ Decreases ionization           C. Does not affect ionization

11.  pH is the measure of what?

 

A.  Hydroxyl ion concentration          ■ Hydrogen ion concentration

12.  What is an acceptable pH range fish production?

 

A. 1-14                  B. 1-6.5           C. 7-14            ■ 6.5-9           E. 3.5-12

 

13.  What is the minimum alkalinity level recommended for fish production?

 

A. 20 mg/L         ■ 40 mg/L          C. 60 mg/L       D. 80 mg/L      E. 200 mg/L

 

14.  Alkalinity is primarily a measure of what ions?

 

A. Carbonates    B. Bicarbonates    C. Hydroxyl      ■ All of these     E. None of these

 

15.  If you measure the hardness of a water sample and obtain a value of 200 mg/L, then the alkalinity of the sample must also be 200 mg/L.

 

A. True      ■ False

16.  Outdoors in ponds when would the free CO2 concentration normally be at its highest?

■ 6 a.m.                B. Noon           C. 3 p.m.          D. 6 p.m.          E. Midnight

 

17.  Increasing CO2 will also increase the pH of water.

 

A. True      ■ False

 

18.  Which of these species is an example of a coldwater fish species?


 ■ Atlantic Salmon             B. Cobia          C. Tilapia         D. Red Snapper

 

19.  For every 18oF increase in water temperature the metabolic rate of fish will increase by how much?

A. Remain constant             ■ Double         C. Triple           D. Quadruple

 

20.  What is the name of the chemical that will neutralize chlorine?

 

____Sodium Thiosulfate___________

 

21.  From a producers standpoint what is the most practical way to remove hydrogen sulfide from well water?

 

A. Neutralizing chemicals       ■  Aeration         C. Switching Sources          D. Freezing

 

22.  What is the recommended minimum water quantity for commercial aquaculture in levee ponds?

 

A. 22 gal./min.        ■ 26 gal./min.         C. 30 gal./min.            D. 34 gal./min.

 

23.  How many reagents did you add when you measured dissolved oxygen using LeMotte Kit?

 

A. One       B. Two       ■ Three     D. Four        E.  I was not paying attention

 

24.  Please outline the life cycle of the eastern oyster.

 

1.      unfertilized egg

2.      fertilized egg

3.      trochophore

4.      veliger

5.      pediveliger

6.      early spat

7.      adult oyster

 

25.  If you were asked to measure the height of an oyster, then how would you do it?

 

Measure from anterior to posterior­­­­­­­­_______________________________________________ ___________________________________________________________________________

 

 

26.  Define Spat.

 

Pedeveliger (eyed larvae) that have settled out of water column and have attached to suitable substrate___________________________________________________________________

 

27.  Based on the lecture, what was the most emphasized aspect of oyster hatchery production?

 

A. Acquisition of broodstock          ■ Food (algae) production       C. Water quality

 

28.  What is the preferred size range of food that oyster larvae are capable of consuming?

 

A. 0-2 mm              B. 2-4 mm        ■ 4-8 mm        D. 10-12 mm

 

29.  What is the preferred size range of food that oyster juveniles are capable of consuming?

 

A. 0-5 mm              B. 5-12 mm      ■ 10-18 mm    D. 18-24 mm

 

30.  In Alabama more oysters are processed than harvested.

 

 ■ True                  B. False

 

31.  Please list up to ten topics that you plan on including in your group project.

 

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