Quarter 1 Module 5: Draw and Layout Tanks

CO_Q1_TLE – Aquaculture 7/8_ Module 5

Technology and

Livelihood Education AQUACULTURE

Quarter 1 – Module 5: Draw and Layout Tanks

(Exploratory Course)

7/8

TLE Aquaculture – Grade 7/8 (Exploratory Course) Alternative Delivery Mode Quarter 1 – Module 5: Draw and Layout Tanks

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7/8

Technology and Livelihood Education

AQUACULTURE

Quarter 1 – Module 5: Draw and Layout Tanks

(Exploratory Course)

Introductory Message

This Self-Learning Module (SLM) is prepared so that you, our dear learners,

can continue your studies and learn while at home. Activities, questions, directions,

exercises, and discussions are carefully stated for you to understand each lesson.

Each SLM is composed of different parts. Each part shall guide you step-by-

step as you discover and understand the lesson prepared for you.

Pre-tests are provided to measure your prior knowledge on lessons in each

SLM. This will tell you if you need to proceed on completing this module or if you

need to ask your facilitator or your teacher’s assistance for better understanding of

the lesson. At the end of each module, you need to answer the post-test to self-

check your learning. Answer keys are provided for each activity and test. We trust

that you will be honest in using these.

In addition to the material in the main text, Notes to the Teacher are also

provided to our facilitators and parents for strategies and reminders on how they can

best help you on your home-based learning.

Please use this module with care. Do not put unnecessary marks on any part

of this SLM. Use a separate sheet of paper in answering the exercises and tests.

And read the instructions carefully before performing each task.

If you have any questions in using this SLM or any difficulty in answering the

tasks in this module, do not hesitate to consult your teacher or facilitator.

Thank you.

1 CO_Q1_ TLE – Aquaculture 7/8_ Module 5

What I Need to Know

This module covers the knowledge, skills and aptitude required in drawing a

lay-out plan for tanks.

After going through this module, you are expected to:

1. identify different kinds of tanks;

2. identify different life support systems for tanks;

3. draw lay-out of different tank designs according to established standard

procedures.

What I Know

Let us know how much you have learned with your previous module. Please

answer the following.

Choose and encircle the letter of the correct answer.

1. How to remedy a tank with low dissolved oxygen?

a. Start the blower c. Start the paddle wheel

b. Start the water pump d. Start the electric fan beside the tank

2. ________ are small aquatic organisms raised in tanks which are commonly

used as the first food of young fin fishes?

a. Larvae c. Rotifers

b. Phytoplanktons d. Microalgae

3. What is the term used to indicate a large container of liquid usually used in

culturing fish?

a. reservoir c. basin

b. tank d. fishpond

4. Why is it necessary to design the tanks in the hatchery?

a. To have a beautiful tanks

b. To create a beautiful arrangement of tanks.

c. To have a uniform size and shape of tanks

d. To conform with the characteristics of the target specie of fish


5. What is the first phase of a fish production system?

a. construction of aquaculture facilities

b. hatchery

c. nursery

d. grow-out

6. Separating suspended solids from water such as silts, debris and foreign

organisms can be done by the use of ______.

a. fine mesh screen c. filtration units

b. secchi disk d. intake structure

7. Early stage of the fish life cycle?

a. egg c. larvae or fry

b. fingerling d. post fingerling

8. The sand filter tank is set up with how many layers of different filter media?

a. 2 c. 5

b. 4 d. 3

9. In a milkfish broodstock tank, what is the design?

a. Triangular c. Square

b. Rectangular d. circular

10. Where are newly hatched fish eggs placed?

a. Hatchery tank c. Nursery tank

b. Broodstock tank d Grow -out tank


Lesson

3 Draw Lay-out Plans for Tanks

What’s In

Let’s try to recall your previous lesson. Answer the following questions:

1. What are the different compartments of a pond?

2. To draw a lay-out plan for ponds, what is the basic procedure to be done in

order to represent the actual measurement of the said layout?

3. What are the following fishpond facilities that control the water of the pond

system?

What’s New

If you plan to invest or venture into fish farming, what is one of the things

that you must consider?

Maybe you think of the relation of the natural resources and its location

where you reside.

In this lesson, you will be directed into another way of developing

aquaculture facilities which may be best fit to your locality.

What is It

Fish Tank Layout and Design

Tank is a large container of liquids, rectangular, square or circular in shape

usually used in culturing fish.


HATCHERY TANK DESIGN

Hatchery is a place where fish eggs, larvae, and /or fish fry are produced

under artificial conditions for later release to its natural habitat or for human

consumption. In terms of production, this is where the first phase takes place.

Followed by nursery to be placed on nursery tank and finally, to grow-out phase to

be cultured in ponds, pens, tanks or cages where fishes are grown to marketable

size.

The hatchery tanks should be made to provide easy operation and free from

work hazards. The design and layout should have room for further expansion with

enough space left for the future tank construction, water and air supply system,

etc.

Fig. 1

Rectangular tank

Figure 2 Basic layout for a small- scale hatchery with 2 larval tanks, 1 sand filter, 3

rotifer tanks in the indoor section, a pump house and 3 microalgae tanks in the

outdoor section.

Source: Image from

the journeytothephilippines.wordpress.com

Pump

Larval / Fry tank

Sand filter

Larval / Fry tank

Rotifer tanks


Source: Image from www.aquatrain.org

Source: CBLM, Fish Culture NC II, 3rd Year, Module II. Pages 11-19.

Type of tanks in small- scale hatchery with 1 meter deep are:

Sand filter tank – composed of layers of different filter media. Water passes through a filter medium, commonly sand and out to the bottom of the tank.

Figure 3 Sand filter tank


Larval rearing tank – about 6 m3 capacity. It must be devised for rapid and complete

draining.

Figure 4 Larval Rearing Tank

Source: Dynamic Team Aqua Ventures Inc. Malapatan, Glan, Sarangani Province

Live food production tanks. These are used for microalgae production and are

usually located outside hatchery tanks .

Small fiber-glass tank (1 to 2 m3 capacity), for rotifer enrichment

Seawater outlet

Sand

Gravel

Large stones

Seawater intake

Figure 6. Small fiber-glass

tank

Figure 6. Live food

production tank Source: Image from www.fao.org


Designing Tanks for Culturing Fish

Tanks can be designed in various ways. These can be made of concrete in

rectangular or square, hexagonal or octagonal or may be a circular one. Tanks for

grow out are typically 4-10 m in diameter, and 1-3 m deep.

Figure 7 Rectangular Tanks Figure 8 Drain Hole


Figure 9 Outlet Hole Figure 10 Drainage Canal


The concrete rectangular tank drain hole fitted with 3 inches PVC pipe is

located at the rear end of the tank (figure 7). The tank floor should have a slight

slope towards the drain hole which is 5 degrees to 15 degrees for easy draining,

cleaning and for maintaining purposes. While the outlet hole (figure 9) is used for

draining water from the tank through the drainage canal (figure 10) that passes out

from the tank site.


Figure 11. The circular fish tanks

Source: Dynamic Team Aqua Ventures Inc. Malapatan, Glan, Sarangani Province

Figure 12. The cross section of a circular or hexagonal fishtank


The outlet must be placed in the middle of the tank. The tank bottom should have

a slight slope towards the center where the outlet is built.

Life Support Units

A. Sea water supply systems includes:

Intake structure – used to pull water from the sea using electric motor with

746 watts and 1 hp

Filtration unit – used to separate suspended solids from the water, e.g .fine

silts, debris and foreign organisms

Water pump – made of cast iron, stainless steels, fiber glass or plastic to

prevent corrosion. It should be self- priming.

Water pump reservoir –holds a ready source of water in any case thereof.

B. Fresh water supply system

Standby water pump and accessories to be used in drawing water from a well

or other sources in case natural water supply is a problem; and

Air supply system. Blower is essential to supply high volume of air at low

pressure in the hatchery. At least one blower with 1-2 hp capacity is needed

although 2 units are better.


Figure 13 Water Pump Figure 14 Blower Figure 15 Tanks with Aerators

What’s More

Classify the types of tanks.


What I Have Learned

Instructions: In a half size illustration board or chipboard make a diorama of a lay-out in a small-scale hatchery tank.

What I Can Do

Instructions: Make a brochure of different tank life support units. Use a cut-out or

a print-out of pictures of each with a clear description of it.

Assessment

Identify each picture and classify accordingly.

A.

1. __________________________ 2. __________________________

B. Label each picture accordingly.

3 4.

5.

C. Explain briefly. Why are tank life support units important in culturing

fish?


Additional Activities

Design a basic layout for a small- scale hatchery with 2 larval tanks, 1 sand

filter, 3 rotifer tanks in the indoor section, a pump house and 3 microalgae tanks at

the outdoor section.


What’s More

Hatchery Tanks Grow-Out Tanks

Sand filter tank Rectangular/square

Larval-rearing tank circular

Live food production hexagonal/octagonal

tank

Answer Key

What I Know

A

C

A

D

B

C

C

D

D

C

What I Have Learned

Check the output of the students.

What I Can Do

Check the output of the students.

Assessment

1. Rectangular tank 2. Circular tank

3. Live food production tank

4. water pump

5. larval rearing tank

C. Answers may vary.


References

Castanos M.T. SEAFDEC Asian Aquaculture [email protected] Patadjai R.S. Article from SEAFDEC Asian Aquaculture Sim S.Y., Rimmer M.A., Toledo J.D., Sugama, S.,Rumengan I., Williams,

K.C.. Philips, M.J. 2005. A Guide to Small-Scale Marine Finfish Hatchery Technology

Toledo C.F. Breeding and Hatchery Management CBLM, Fish Culture NC II, 3rd Year, Module II. Pages 11-19. http://www.fao.org

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Quarter 1 Module 5: Draw and Layout Tanks

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