Preparing facilities for pond, pens and cages

Information Sheet CODE LO3-2

Practical procedures in estimation of hatchery facilities, including tank
sizes, blower and pump capacities are outlines in Reyes and Torres
(1985) and in Kungvankij et al (1986c).

Information Sheet CODE LO3-3

DRAINING THE TANK

This is employed by using a hose. The hose may either be
plastic/canvass/rubberized, plastic hose is transparent and flow of water
can be seen unlike the rubberized or canvass type which are opaque
and water flow is not visible. It can only be determined as filled when
water flow through out on the other end.

To siphon out water in the tank, follow the steps:

1. Get the hose and wrap one end with nylon net of fine mesh and tie
tightly the net seine as filter.

2. Hold closely both ends at the same level in one hand.

Information Sheet CODE LO3-3

3. Fill hose with water until it flows through. Then stop filling.

4. Submerge the other end with filter into the tank and keep still. Be
sure water do not flow on the other end, so keep it higher.

5. Lower the other end slowly to the floor so that water flow through
continuously.

6. Call your instructor to check if you have done the right thing.

Information Sheet CODE LO3-3

NOTE: Do not allow the tank to drain completely while the
remaining stock are not yet collected. Drain about ½ of total
volume and gradually increasing the volume while
collection is done simultaneously.

B. Drainage method

If tank has a drain pipe installed at the bottom of the tank, you can
do the steps listed below:

1. Fit in or install the screen/filter over the drainage tightly in
order for the stocks not to escape.

Information Sheet CODE LO3-3

2. Turn the regulator valve slowly to drain. Close when
necessary.

3. Call your instructor to check if you done the right thing.

Information Sheet CODE LO3-3

Clean Tanks

Chemical Components of Disinfectants

Disinfection Of Contaminants Tanks Or Ponds And Material

Generally, disinfection of tanks or ponds is carried out with Quicklime
and sometimes CALCIUM CYNAMIDE. Potassium permanganate can be
used.

For disinfecting equipment, commercial sodium hypo chlorite,
quaternary ammonium compounds, iodophores or benzalkonium
chloride can be used.

a. Disinfection with quicklime or cyanide , this is
recommended for large tanks and ponds with natural
bottoms.
1. water must be emptied while the bottom is
still wet roughly crushed quicklime and
spread at a ratio of 100 gm (3 ½ 02 ) per
sq.m. (1,000 kg or 1 ton / ha.
2. Left for 15 days until it become milky
3. Replace by Fresh water

b. Disinfection . w/ potassium permanganate.
1 gm / 1,00 liters ( 22 gal ) of water is suitable for
small tanks. Weaker bath is given if fish cannot lee
removed 1gm / 200 liters. The fish can with stand for
1 hour.

Disinfection of equipment

= Benzalkonium chloride Solution
600 to 1,000 PPM of active ingredient

= General recommends sodium hypochlorite,
Ammonium compounds or iodophores For Fish
Farming equipment

Information Sheet CODE LO3-3

Self – check

Choose the letter of the correct answer then write it on the before each
number.

______1. It is an enclosure made of concrete, bricks or similar
materials provided with inlet and outlet pipe for water
management and fish are stacked for cultivation.

a. Cage b. pen c. tank

______2. The depth of water in the tank

a. 1m b. 5 m c. 2m

______3. Air for the medium to large –scale hatcheries can be provided
by ;

a. Blower b. compressor c Aerator

______4. Are used for sea water in take due to its higher total head
capacity.

a. Marine pumps b. Submersible pumps c. centrifugal pumps

______5. For maintenance of sanitation and good water quality are
usually cleaned by;

a. detergent solution b. Chlorox

c. sprayed with hot water and diluted Chlorox d. all of
these

Information Sheet CODE LO3-3

Answers Key

1. C
2. A
3. A
4. C
5. D

QUESTIONING/ INTERVIEW

Candidate’s Name :

Unit of Competency: Perform Fish or Shrimp Grow-out Operations

Competency Standards: Junior Aquaculture Technician NC II

Oral/Interview questions Satisfactory Response

Yes No

What if you were using other materials instead of

concrete materials for tanks? Would there any

difference?

What would you do if the tank is not sealed

properly?

What would you do if there's oxygen deficiency in

the tank?

If stress occurs in the tank, what action would you

take?

What are the specified procedures or steps to

follow in culturing fish/ shrimp in the tank?

The Candidate's underpinning knowledge was:

Satisfactory  Not Satisfactory 

Assessor Dat

Signature e

Feedback to candidate:

Acceptable Answers are: Date:
1. (Insert suggested answers to questions)
2.
3.

Assessor signature:

Assessment Activity 1

Instruction: Design evidence-gathering tools for a unit of competency using
the following templates.

DEMONSTRATION Perform Fish/ Shrimp Grow-out Operations
Candidate’s name:
Assessor’s name:
Unit of competency:

Competency standards:
Date of assessment:

Time of assessment:
Instructions of demonstration

Materials and equipment

(insert details of materials and equipment needed for the demonstration)

OBSERVATION to show if the evidence is
demonstrated
During the demonstration of skills, did
the candidate: Yes No N/A
Clean and dried the tanks properly?
Disinfect the tank before culturing
fish/shrimp.
Use recommended kind of disinfectant
for tank?

The candidate's demonstration was: Not Satisfactory 
Satisfactory 

PERFORMANCE TEST

Learners Name: Date
TEST ATTEMPT
Competency : Perform Fish or Shrimp Grow-
out 1ST 2nd 3rd

Operation

Direction: Over all Evaluation
Call Instructor: Ask
Level Achieved Performance Level
Instructor to assess your
performance in the following 4- can perform this skill without
critical task and supervisions and with initiative
performance criteria below. and adaptability to problem
situation.
You will be rated based 3- Can perform this situation
on the overall evaluation on can perform this skill
the right side. satisfactorily without assistance
or supervision.
2- can perform this skill
satisfactorily but required some
assistance and / or supervision.
1- can perform parts of this skill
satisfactorily, but requires
considerable assistance and / or
supervision.

PERFORMANCE STANDARD YES No N/A
For acceptable achievement, all items should receive a
yes or n/a response.
1. Did you cleaned and dried the tanks properly?
2. Have you disinfected the tanks before culturing fish
/ shrimp?
3. Did you used appropriate disinfectant for tank?
4. Have you water the tank in required deepness?
5. Did you followed the steps in preparing tanks before
stocking fish or shrimp ?

Record of Achievement
Module: Preparing Facilities Pond, Cage and Tank

Learning Outcome No. 3- Clean Tank
Performance Criteria:

14. Cleaned and dried the tank properly
15. Disinfected the tank before culturing fish/shrimp
16. Used appropriate disinfected for tank
17. Follow the steps in preparing the tanks before stocking

fish/shrimps
18. Dried the pond
19. Applied lime and fertilizers
20. Grown natural fish foods
COMMENTS:
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Learner has satisfied the above performance criteria:
Learner’s signature:____________________________
Trainer’s signature:_____________________________
Date:_________________________________________