It's a presentation on practical works of aquaculture course.

1. GROUP - 1
WELCOME TO OUR
PRESENTATION
AQUACULTURE PRACTICAL WORKS
DEPARTMENT OF FISHERIES
CONDUCTED BY
DR. HOSSAIN ZAMAL SIR

2. 05
04
03
02
01 Soil Quality Test
Pond Area Volume & Contour Line
Pond Productivity
DO Saturation Level
Evaluation of Aquaculture Site
EXPERIMENTS

3. DETERMINING
POND AREA AND
VOLUME
EXERCISE 1
KOMOL DIGHI

4. First, we Measured the
Length and width of the
Pond.
Then, we calculated the
pond area by multiplying
pond width with the length.
Length
24.667 feet
1
2
Width
18 feet
Pond Area
(24.667×18)
= 444 sq. Feet
POND AREA

5. After that we measured the
depth of the pond by taking
several measurement from
different places of the pond.
We followed the “X” pattern
method.
Average water depth was
calculated.
3
Water Depth
=0.77 feet
WATER DEPTH
Avg. Water Depth
0.77 feet

6. 4
Pond Volume
341.88 𝑓𝑡3
or
0.0077 acre-feet
POND VOLUME
Pond volume was
calculated by multiplying
pond area with avg. depth.
Pond volume was
converted from cubic feet to
acre-feet.

7. DETERMINING CONTOUR LINE
We measured the depths of the pond along its
length keeping 1 ft interval between each
measurements. Then we graphed the depth values
and determined the contour line of Komol Dighi.
5

8. CONTOUR LINE OF KOMOL DIGHI
-160
-140
-120
-100
-80
-60
-40
-20
0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
PondDepth
Axis Title
CONTOUR LINE OF KOMOL DIGHI

9. TESTING
SOIL QUALITY
EXERCISE 2

10. For this test we took some
soil in our hand, rubbed it
between fingers.
The soil felt gritty and
smooth.
1
The soil was
Sandy Loam
FEEL TEST
If we rub some moist soil between our fingers.
• Sand will feel gritty.
• Silt will feel smooth.
• Clay will feel sticky.
The soil was not sticky.
That determines it was not
rich in clay particles.
From this test
we can say

11. We formed a ball from the
sampled soil. Dropped the
soil ball from 1 m above and
observed the following.
The soil ball stick to the
floor, but cracked.
2
The soil was
Silty Loam
SOIL DROP TEST
If we drop a soil ball from above:
• Sand soil will get scattered on the floor.
• Silt soil will break but stick to the surface.
• Clay soil won’t break and stick to the surface.
From this test
we can say

12. In this test we made rolls
and rings from sampled soil
and observed the following.
Couldn’t make the rolls long
enough. As the roll
becomes longer it becomes
susceptible to breaking.
Ring formed but broke in
parts.
3
The soil was
Loam & Silty
Loam
ROLL & RING TEST
From this test
we can say
The Ring Cracked

13. By measuring their
respective heights we
calculated the proportion of
sand, silt and clay in the soil
sample.
A solution of soil was made. We let it settle for 2 minutes and 2 hours respectively. 3
different layers was created after 2 hours of settling. These are namely Clay layer, Silt
Layer and Sand Layers.
4
THE JAR TEST
After 2 minutes –
2 layers of sand
After 2 hours –
3 layers of sand, silt and clay

14. Height of All 3 Layers =
1.42 inch = 100%
Height of Sand Layers =
(.96/1.42) × 100= 68%
4
The soil was
Sandy Loam
THE JAR TEST
From this test
we can say
Height of Silt Layers =
(.23/1.42) × 100= 16%
Height of Clay Layers =
(.23/1.42) × 100= 16%
Clay 16%
Silt 16%
Sand 68%

15. By Measuring Secchi Depth
DETERMINING
POND
PRODUCTIVITY
EXERCISE 3

16. We dropped the secchi disk
into pond water and
measured the transparency
The Pond
Productivity was
Healthy
SECCHI DEPTH
From this test
we can say
SECCHI DISK READING STATUS
>60 cm Inadequate
30 - <45 cm Dense
15 - <30 cm Bloom
<15 cm Critical
45 - <60 cm Healthy
We found the secchi depth
55cm. That indicates a
healthy structure of the
pond water.

17. In Aquaculture Pond Water
DETERMINATION
OF SATURATION
LEVEL OF DO
EXERCISE 4

18. We took 2 samples from the
pond.
One from the surface water
Another from 45 cm depth
1
DO at surface water:
3.82 mg/L
DO at 45 cm depth:
3.33 mg/L
MEASURING DO
Then we measured DO in
those samples at lab
occupying Wrinkler’s
Method. The Following
Results are found:

19. Temperature of Surface water was 14 ℃
Temperature of water at 45cm depth was 13 ℃
Now, lets calculate the DO
saturation value for both
samples.
2
DO Saturation at
surface water:
37.12%
DO Saturation at 45
cm depth:
31.62%
DO SATURATION
At 14 ℃ 3.82 mg/L DO shows (3.82/10.29) ×100 = 37.12% Saturation at surface water
At 13 ℃ 3.33 mg/L DO shows (3.33/10.53) ×100 = 31.62% Saturation at 45 cm depth
100% DO saturation at 14 ℃ is 10.29 mg/L
100% DO saturation at 13 ℃ is 10.53 mg/L

20. EXERCISE 5
EVALUATING AN
AQUACULTURE SITE
USING QUICK METHOD

21. OUR SCORE
1
CRITERIA 1
WATER QUALITY
• HEALTHY
• PRODUCTIVE
• GREENISH
The water seemed

22. OUR SCORE
2
CRITERIA 2
SOIL QUALITY
• SANDY LOAM
• LESS CLAYEY
• NOT GOOD FOR
AQUCULTURE
The soil of the site was

23. OUR SCORE
3
CRITERIA 3
SOCIO-ECONOMY
• HOMESTEAD POND
• MICROECONOMY
• SMALL-SCALE RURAL
AQUACULTURE
Socio-economical Support

24. OUR SCORE
4
CRITERIA 4
TOPOGRAPHY
• LOW-LAND
• SUCSEPTIBLE TO
FLOODING
• NO PUMPING COST
The Site is a Valley

25. OUR SCORE
5
CRITERIA 5
ELEVATION
• MODERATELY ELEVATED
• ABOVE THE
SURROUNDING LAND
• WATER SUPPLY
THROUGH GRAVITY
Plain Land on a valley

26. OUR SCORE
6
CRITERIA 6
AVAILABLE AREA
• ADEQUATE SPACE
• ENOUGH LAND
AVAILABLE FOR BUILDING
PONDS
• EXTENSIVE
AQUACULTURE
The area was adequate

27. OUR SCORE
7
CRITERIA 7
POTENTIAL OF FLOOD AND STORM
• MINIMAL FLOODING
DURING MONSOON
• ENOUGH DRAINAGE
SYSTEM
• SUSCEPTIBLE TO STORM
The area was moderately
vulnerable

28. OUR SCORE
8
CRITERIA 8
ACCESSIBILITY
• NO DIRECT ROAD
• HILLY AREA
• CLOSED VALLEY
• NEAR TO OTHER
FACILITIES
Not easily accessible

29. OUR SCORE
9
CRITERIA 9
OWNERSHIP
• LEASED LAND
• SINGLE OWNERSHIP
Available for lease

30. OUR SCORE
10
CRITERIA 10
VEGETATION
• WATER HYACINTH
• TREES ON THE DIKE
• CROP LANDS
Moderate vegetation

31. OUR SCORE
11
CRITERIA 11
SEASONAL INFLUENCE
• WATER LEVEL NEARLY
SAME ALL YEAR ROUND
• PREVENTIVE FACILITY
DURING FLOOD
Less affected by seasonal
changes

32. OUR SCORE
12
CRITERIA 12
WATER SOURCE
• SPRING WATER
AVAILABLE
• FRESHWATER STREAM
• GROUNDWATER
• RAIN WATER
Multiple sources of good
quality freshwater

33. Criteria Weight Our Score Weighted Score (Our Score × Weight) Ideal Score (Weight × 3)
Water Quality 3 3 9 9
Soil Quality 3 1 3 9
Socio-economy 2 3 6 6
Topography 3 2 6 9
Elevation 2 2 4 6
Available area 2 3 6 6
Potential of flood and storm 3 2 6 9
Accessibility 2 2 4 6
Ownership 1 2 2 3
Vegetation 1 2 2 3
Seasonal Influence 2 3 6 6
Water Source 3 3 9 9
Total Sore 63 81
TOTAL SCORE
PERCENTAGE SCORE OF THIS SITE IS (63/81)× 100% = 77.77%
COMMENT & EVALUATION = THIS SITE IS GOOD FOR AQUACULTURE