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Give TWO (2) maintenances for cage system
Inspect and repair the net, change and clean the net, inspect cage system.
Give TWO (2) ways to prevent predators from fish pond.
Very short grass, maintain full pond water level, bird net, dog
Give TWO (2) examples of predator of pond fish.
Snake, monitor lizard, birds, human, dog
Give THREE (3) examples of biosecurity measures in aquaculture
Sanitation, Healthy broodstock, Egg disinfection, Traffic restriction, Water treatment, Effluent treatment, Clean feed
What is biosecurity?
Measure for disease free environment - healthy animals.
What are the differences between extensive, semi-intensive and intensive system?
Stocking density, feed, water exchange, aeration
When is the best stocking time?
Morning (7am - 10am), evening (9pm - 12am) - when low temperature
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.
Recommended stocking size for grow-out pond.
4 inch
Why need to stock fish with uniform size?
Prevent cannibalism, big fish dominates feeding area, several fish have unmarketable size.
Give TWO (2) signs of poor quality fingerlings.
Patches over the body, missing fins, signs of physical injury, deformed
Give TWO (2) practical criteria for good quality of fingerlings.
Source, Physical appearance, How they swim
If water depth is 30cm, calculate the water volume.
7.875 m3 or 7,875,000 cm3
Give THREE (3) factors of successful stocking.
Quality of fingerlings, How they are stocked, When they are stocked
Fish will only show mortalities after stocking for how many days?
3 days
Give TWO (2) effects of poor stocking process.
Disease, reduced growth, mortality
Give TWO (2) differences between fry and fingerling.
Fry: 1-2cm, smaller zooplankton feeder; Fingerlings: 10-15cm (4 -6 inch), grow-out.
Name this stage of fish.
Fingerlings
They start to have the shape of the fish, 1-2 cm, smaller size zooplankton feeder.
Fry
Name this stage of fish
Hatching
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