0. PRINCIPLES OF AQUACULTURE (AKU3201) 20May 2012
Biosecurity & predator control

1. Unwanted predators
Bird
Wild fish
Frogs
Reptiles (snakes, turtle, alligators)

2. Birds

3. Crabs - marine

9. Aquatic weed
Filamentous algae/scum
Floating weed
Emergent weed
Submerged weed
Marginal weed

11. Water lily

12. Hydrilla

13. Duckweed

16. Prevention of aquatic weeds
Avoid shallow pond. Why?
Use grass carp
Proper fertilization to establish phytoplankton bloom
Manual harvesting
Herbicides

17. Factors causing disease 1) Stress e. g
Factors causing disease 1) Stress e.g., physical injury 2) Pathogen 3) Environment e.g., pollution 4) Sometimes nutrition
Disease
Disease agent
Env.
Fish