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PRINCIPLES OF AQUACULTURE (AKU3201) 20May 2012

PRINCIPLES OF AQUACULTURE (AKU3201) 20May 2012. Biosecurity & predator control. Unwanted predators Bird Wild fish Frogs Reptiles (snakes, turtle, alligators). Birds. Crabs - marine. Aquatic weed Filamentous algae/scum Floating weed Emergent weed Submerged weed Marginal weed.

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PRINCIPLES OF AQUACULTURE (AKU3201) 20May 2012

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

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

  3. Birds

  4. Crabs - marine

  5. Aquatic weed • Filamentous algae/scum • Floating weed • Emergent weed • Submerged weed • Marginal weed

  6. Water lily

  7. Hydrilla

  8. Duckweed

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

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

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