Aquaculture Systems

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Aquaculture Systems

  1. 1. Aquaculture Systems
  2. 2. Types of systems <ul><li>Cage </li></ul><ul><li>Raceway </li></ul><ul><li>Pond </li></ul><ul><li>Recirculating Tanks </li></ul>
  3. 3. Cage <ul><li>Use existing bodies of water </li></ul><ul><li>Very inexpensive </li></ul><ul><li>Easy to harvest </li></ul><ul><li>Can move cage to fresh water </li></ul><ul><li>Fish can escape or be stolen/released </li></ul><ul><li>Problems with pollution and depleted oxygen </li></ul><ul><li>Used for sea species, salmon, trout*, bass, catfish </li></ul>
  4. 4. Raceway <ul><li>Need constant flow of water </li></ul><ul><li>High water quality </li></ul><ul><li>Expensive Construction </li></ul><ul><li>May need waste treatment system </li></ul><ul><li>Easy to harvest & maintain </li></ul><ul><li>Catfish, bass, trout, eels </li></ul>
  5. 5. Pond <ul><li>Most common method </li></ul><ul><li>Large scale production </li></ul><ul><li>Need Aeration </li></ul><ul><li>Harvest is difficult </li></ul><ul><li>Shrimp, catfish, striped bass, sunfish </li></ul>
  6. 6. Recirculating tanks <ul><li>Uses least amount of water </li></ul><ul><li>Best temperature control </li></ul><ul><li>Fish can’t escape </li></ul><ul><li>Easy harvest </li></ul><ul><li>Lowest water quality </li></ul><ul><li>Highest energy costs </li></ul><ul><li>Ornamental fish, </li></ul><ul><li>Tilapia, catfish </li></ul>
  7. 7. Recirculating Tanks <ul><li>Main Tank </li></ul><ul><li>Bio Filters </li></ul><ul><li>Sediment Tank </li></ul><ul><li>Pumps </li></ul><ul><li>Water in/out control </li></ul>
  8. 8. Main Tank <ul><li>Holds fish </li></ul><ul><li>Creates circular water pattern </li></ul><ul><li>Collects from the bottom </li></ul><ul><li>Removes Sediment/waste </li></ul>
  9. 9. Biofilter <ul><li>Bacteria ( Nitrosomonas & Nitrobacter ) cling to plastic discs </li></ul><ul><li>Bacteria control the Ammonia </li></ul><ul><li>Takes 4-6 weeks for colonization </li></ul><ul><li>Ammonia ->Nitrite ->Nitrate </li></ul><ul><li>NH 3 & NH 4 + ->NO 2 ->NO 3 </li></ul><ul><li>Most toxic -> Least toxic </li></ul>
  10. 10. Sediment Tank <ul><li>Has a cone shaped bottom </li></ul><ul><li>Non-soluble solids settle out </li></ul><ul><li>Soluble solids – give the water a brown color – need special filters </li></ul>
  11. 11. Sand filter <ul><li>Removes solids </li></ul><ul><li>Sand clogs quickly </li></ul><ul><li>After 4 months </li></ul><ul><ul><li>No longer functional </li></ul></ul>
  12. 12. Aquaculture Tanks
  13. 13. Equipment <ul><li>Biofilter – plastic substrate that bacteria can cling to. </li></ul><ul><li>Bacteria convert toxic ammonia (NH 3 ) in fish waste to nitrite (NO 2 ) and then nitrate (NO 3 ) which is least toxic. </li></ul>
  14. 14. Equipment <ul><li>Aerators keep the water circulating and keep oxygen in the water so fish do not suffocate. </li></ul>
  15. 15. Equipment <ul><li>Seines – nets with predetermined opening sizes to catch or hold only fish larger than a specific size </li></ul>
  16. 16. Equipment <ul><li>Live cars: temporary net for holding fish until sale or shipment </li></ul>
  17. 17. Shrimp Harvest <ul><li>Video </li></ul>

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