Raceway aquaculture

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1. Raceway culture   Flowing water is diverted from natural streams or a well. Raceways are typically used for raising rainbow trout. To be considered a low-risk method, waste must be treated and fish escapes prevented.

2. Advantages of raceways higher stocking densities improved water quality reduced manpower ease of feeding ease of grading ease of harvest precise disease treatments collection of fish wastes

3. Types of Raceways Concrete Stone Earth Fiberglass Polyester resin Raceway Structures Structure should be like that where….. Water should be move easily Must be attached with Stream River Canal

4. Raceway pond Different raceway ponds available like for Fry culture Marketable production of trout Brood stocking

5. raceway Raceway pond Canal or river inlet outlet

6. Fry culture Depth should be 30cm Slope should be 1/100 Width of raceway 1.5m Length of raceway should be 10-20m Inlet and outlet should be cover with gauze Market production Depth should be 60cm Slope should be 1/100 Width should be 3m or less Length 10-30m Inlet or outlet according to the fish size to escape from pond Brood stocking Depth not less than 90cm. Slope 1/100. Width 2m Length 20-40m

7. Concrete silo Used for trout production Diameter 2-10m Bottom slope 5-10% for waste removal Outlet located in center of concrete silo

8. Requirement of system Water supply Aerations  Removal of solid waste matters Productivity Waste water treatment Water supply Jet nozzle Provide force Water movement Above surface of water Or below to water Not at bottom because they uplift waste

9. Aerations Aeration compulsory for dissolved oxygen Different mechanism used like Pumps Agitators Blower Removal of solid waste Waste accumulation spoil water quality waste removed by Sucking machine Increase water flow Water velocities over 7-8cm/sec are found to be effective for the waste removal Lowered water level down to 30 cm in depth makes the removal more effective

10. Productivity Productivity of fish is strongly related with exchanging rate of the culture water Rainbow trout, it amounts 1㎏/year under water flowing rate of 1ℓ/min. Productivity increases up to 5kg/year under same water flowing rate in case that best management is offered. References Buttner , J.et al. (2008). "Freshwater Aquaculture Species for the Northeast“. Northeaster Regional Aquaculture Center (NRAC), University of Maryland, Publication No. 102-2008. Accessed 29.9.2011. Raceway Culture for Freshwater Species". Korea – U.S. Aquaculture. Accessed 29.9.2011.