Observation of the fisheries lakes and identification of possible improvement measures

1. PRESENTED BY-
OBSERVATION OF THE FISHERIES LAKES AND
IDENTIFICATION OF POSSIBLE IMPROVEMENT
MEASURES
Md. Nazmul Islam

2. Inland fisheries management is the art and science of producing
sustainable annual crops of wild fish for recreational and
commercial uses that mostly depend on inland water bodies. In
prospect of Bangladesh fish production mostly depends on culture
fisheries ( 55% of the total production). Fish production from a lake
varies with good monitoring and investigation.

3.  To gain a clear idea about the present Status of the lake.
 To identify the problems around the lake.
 To improve the lake condition.
 To mitigate problems associated with the culture system in this lake.
 To establish new approach of management.
 To make sure that it is culturable and productive lake.
 To ensure recreational water activities based on fisheries.

4. In 1995 (SGVC) this area was a submerged land. In 2006 (SAU) it
was renovated and rebuilt as a lake.
0.305m (In dry season)
1.0668 (In rainy season)
506.65 m (In dry season)
1505.16 m (In rainy season)
(91×200) sq. ft.
=18200 sq. ft.
1×200)
ft.
Figure: Area Measurement

5. Eastern side- Situated in front of the
mosque of Sylhet Agricultural University.
Western side- A bridge is situated
between Agriculture and Fisheries
building.
Southern Side-Situated in front of
Agriculture and under construction
Economics building.
Northern side- Situated forward to
Fisheries building.
Figure: Location of the fisheries Lake

6. Dike:
 Well developed dyke is absent.
 Undesirable weeds are covered the dyke system.
Topography & Bottom condition:
 Soil is slightly acidic.
 Irregular bottom condition.
 High organic load in the bottom..
Figure: present dike condition

7. Drainage & Inlet, Outlet:
Appropriate drainage system is totally absent
including Inlet and outlet.
Water Source:
• Totally depends on rain water.
• No water supply facilities.
Figure: Water passing system of the lake
Water Holding Capacity:
• Round the year carry water.
• Rainy season contain more water than
other seasons.

8. Turbidity:
• No algal bloom present.
• At present condition is slightly turbid.
Aquatic weeds:
We found that most dominancy
of aquatic weeds especially topapana.
Figure: aquatic weeds
Figure: Turbidity

9. Trees on the Dyke:
• Small amount of trees are present
around the lake.
• Sunlight penetration is available.
Openness:
• The lake is located almost in open
place.
• Regular sunlight around the day but
trees are only problem.
Figure: Trees on dike

10.  This lake is not suitable for monoculture, but is good for
polyculture such as Rui,Tilapia,Pungus and SIS.
 The culture system is extensive.
 Culture period is February to November.
 Harvesting period is September to October.
 Available fish species Mola,Punti,Taki,Shol, magur etc.

11. Water color: Blackish green
water temperature: 18.3º C
Transparency: 3.5 cm
Hydrogen Sulfide gas
Probability of
waterborne microorganisms

12. Figure: Transparency
measurement
Figure: Temperature measurement
And here is the pictures

13.  The dumping of waste by others faculties.
 High organic load from residential halls.

14. Damping garbage
Branches of trees
Excessive weed &
bloom
Poor
Inlet, outlet
Siltation
Litter Fall
SiltationSewage line
Improper dike
Overall
Problems

15. A. Aquacultural Management.
B. Water Quality Management.
C. Recreational Management.

16. Water quality management is important to maximize fish
production through healthy environment.
Dike Construction:
• Dike construction through the consideration of rainy season.
• Slope maintain1:2 – for sandy soil.
1:1.5 – for loamy clay soil.
Cleaning of the Dike:
• Big trees, weeds, must be removed to prevent leaf toxicity.

17. Removal of Bottom Mud:
• During winter/dry season must be
removed by daily labor.
• After drying liming on the bottom.
Removal of harmful Predator fish and
insects:
• Use of chemical treatment to remove harmful
fish & insects.
Figure: Bottom mud removing
Figure: Liming

18. Aquatic Weed Control:
• Can be removed by
Hand removal daily labor, machinery.
• Use of chemical treatment.
• Release of Weed eating fish.
Controlling of Turbidity:
• Prevention of the outer organic flow
to water body.
• Dike system should be well
developed..
Figure: Aquatic weed control

19.  To be ensure alternate water source during summer.
 Sluice gate for proper water passing.
 Lake can be divided into three parts for monoculture.
 Appropriate fish feeding system for reducing the water
pollution.
 Culture of fish according to water layer for mono/poly
culture.

20. Hydroponic garden
Sports Fishing or Angling
Water fountain

21. Artificial Lighting
Sitting system for human rest.
Flowering on the Lake side

22. Implantation of the
flowering trees.
Creating footpath at
dike for human
Melioration

23. • As a lake of faculty of fisheries, we can use this lake for
research purposes through different culture system &
Breeding development .
• Also need to grow awareness about pollution and
• Enhance Beautification to increase faculty
attractiveness.
For maximum fish production and minimize cost, a lake and its
associated criteria should be observed and improvement measures
should be taken.

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