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Presented by: Hina Amir
1.   Introduction2.   Characteristics          Food          Management          Productivity3.   Advantages4.   Disadv...
• Aquaculture• Marine and freshwater species        Categories:      Extensive aquaculture.      Semi-Intensive aquacult...
Culture and rearing in which human intervention is concentrated on the reproduction of the stock, in addition to capture....
• Not rely on excessive working in the growing  process.• The stock is left to grow on its own, utilizing  natural food so...
 Utilizes natural photosynthetic production  of food (algae, plankton, molluscs,  crustaceans) to feed the fish. (insect...
Water ManagementWater management is totally dependent on tidal fluctuation.Water change is effected through tidal means,...
• Undeveloped parts of the World      (Southeast Asia)• Areas of coastal mangrove swamps,  marshes, estuaries.    (not in ...
• Low stocking densities (e.g., 5 000-10 000  shrimp post larvae (PL)/ha/crop)• The ponds used for extensive culture are  ...
1. Can be undertaken in existing farm   dams.2. Negates the need for costly built   structures.3. Low overheads and produc...
4- Low labor costs. low stocking densities less attention to water quality issues and    stock monitoring .5- Many other...
1- Natural habitat destruction  Example:• Philippines, shrimp aquaculture,  destruction of thousands of acres of  mangrove...
• Phytoplankton and algae, reduces the  amount of available oxygen in the water  column, kills the Benthic organisms.2-Ano...
3- Foreign fish interbreed with wild species,  upset the genetic variability of the species,  more prone to disease and in...
5- Diseases and Parasites     Example:•   "black gill " disease     caused by fungus, bacteria or detritus.      Necrosis ...
• Intensive aquaculture • Extensive aquaculture   • Complete diet          •Utilize natural                             pr...
More Predation       No or less predation control               controlMore labor           Less laborLarge productiv...
REFERENCES• Allen, .(1989). Freshwater Fishes of Australia.  T.F.H Publications: New Jersey, USA.• Mackinnon, M. (1995). F...
• Tidwell, J. H. (2012) Aquaculture Production  Systems ,John Wiley & Sons,  ISBN0813801265 :pp.88-89• McCormack, G. and J...
Extensive Aquaculture
Extensive Aquaculture
Extensive Aquaculture
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Extensive Aquaculture

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Extensive Aquaculture

  1. 1. Presented by: Hina Amir
  2. 2. 1. Introduction2. Characteristics Food Management Productivity3. Advantages4. Disadvantages5. Comparison6. References
  3. 3. • Aquaculture• Marine and freshwater species Categories: Extensive aquaculture. Semi-Intensive aquaculture. Intensive aquaculture.
  4. 4. Culture and rearing in which human intervention is concentrated on the reproduction of the stock, in addition to capture.Selective increase of the production man’s food (salmon, oysters, etc.) industry (algoculture) pleasure (sport fishing, pearl culture, etc.).
  5. 5. • Not rely on excessive working in the growing process.• The stock is left to grow on its own, utilizing natural food sources.• Fish chosen for extensive aquaculture are very hardy• Prawns, muscles, seaweed, carp, tilapia, tuna and salmon
  6. 6.  Utilizes natural photosynthetic production of food (algae, plankton, molluscs, crustaceans) to feed the fish. (insect larvae, snails; and worms). Certain producers provide additional feed. Examples – Carp, in mixed farming with other species (whitefish, catfish, etc.).
  7. 7. Water ManagementWater management is totally dependent on tidal fluctuation.Water change is effected through tidal means, i.e., new water is let in only during high tide and the pond can be drained only at low tide.
  8. 8. • Undeveloped parts of the World (Southeast Asia)• Areas of coastal mangrove swamps, marshes, estuaries. (not in use for other purposes)• Indonesia = six million acres
  9. 9. • Low stocking densities (e.g., 5 000-10 000 shrimp post larvae (PL)/ha/crop)• The ponds used for extensive culture are usually (more than two ha) and may be shallow• Production is generally low at less than 1 t/ha/y
  10. 10. 1. Can be undertaken in existing farm dams.2. Negates the need for costly built structures.3. Low overheads and production costs due to no feeding and aeration requirements.
  11. 11. 4- Low labor costs. low stocking densities less attention to water quality issues and stock monitoring .5- Many other uses of the waterway, such as recreational boating and fishing, occur simultaneously
  12. 12. 1- Natural habitat destruction Example:• Philippines, shrimp aquaculture, destruction of thousands of acres of mangrove fields• Benthic habitats are being depleted, organic waste produced by the fish.
  13. 13. • Phytoplankton and algae, reduces the amount of available oxygen in the water column, kills the Benthic organisms.2-Another serious problem, extensive aquaculture is the introduction of invasive species into ecosystems
  14. 14. 3- Foreign fish interbreed with wild species, upset the genetic variability of the species, more prone to disease and infection.4- Some farmers protect their stocks from predatorily birds such as pelicans and albatross by shooting sometimes endangered creature
  15. 15. 5- Diseases and Parasites Example:• "black gill " disease caused by fungus, bacteria or detritus. Necrosis and browning of exoskeleton,6- A non-reliable water supply (e.g. drought)
  16. 16. • Intensive aquaculture • Extensive aquaculture • Complete diet •Utilize natural productivity •High density •Low density •Limited space •No supplemental feeds •High water exchange •Low water exchange
  17. 17. More Predation No or less predation control controlMore labor Less laborLarge productivity Small productivityqualified as qualified as ‘processing ‘production’
  18. 18. REFERENCES• Allen, .(1989). Freshwater Fishes of Australia. T.F.H Publications: New Jersey, USA.• Mackinnon, M. (1995). Fish for Farm Dams. Queensland Department of Primary Industries, Brisbane.• .• NSW Fisheries (1994). Freshwater Crayfish Advisory Pack. NSW Fisheries, Sydney.
  19. 19. • Tidwell, J. H. (2012) Aquaculture Production Systems ,John Wiley & Sons, ISBN0813801265 :pp.88-89• McCormack, G. and Jackson, P. (1991). The Farm Fish Book - Proceedings of the Seminar on Stocking Fish in Farm Dams for Recreation and Farm Table Use. Queensland Department of Primary Industries, Brisbane

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