Name this stage of fish
Hatching
They start to have the shape of the fish, 1-2 cm, smaller size zooplankton feeder.
Fry
Name this stage of fish.
Fingerlings
Give TWO (2) differences between fry and fingerling.
Fry: 1-2cm, smaller zooplankton feeder; Fingerlings: 10-15cm (4 -6 inch), grow-out.
Give TWO (2) effects of poor stocking process.
Disease, reduced growth, mortality
Fish will only show mortalities after stocking for how many days?
3 days
Give THREE (3) factors of successful stocking.
Quality of fingerlings, How they are stocked, When they are stocked
If water depth is 30cm, calculate the water volume.
7.875 m3 or 7,875,000 cm3
Give TWO (2) practical criteria for good quality of fingerlings.
Source, Physical appearance, How they swim
Give TWO (2) signs of poor quality fingerlings.
Patches over the body, missing fins, signs of physical injury, deformed
Why need to stock fish with uniform size?
Prevent cannibalism, big fish dominates feeding area, several fish have unmarketable size.
Recommended stocking size for grow-out pond.
4 inch
Give TWO (2) reasons to stock 4 inches of fish fingerlings.
Avoid predation, Overcome minor stressful condition, Able to swim across the pond for feed.
When is the best stocking time?
Morning (7am - 10am), evening (9pm - 12am) - when low temperature
What are the differences between extensive, semi-intensive and intensive system?
Stocking density, feed, water exchange, aeration
What is biosecurity?
Measure for disease free environment - healthy animals.
