The document discusses raceway culture for raising rainbow trout. Raceways are flowing water channels that divert water from natural streams or wells. They allow for higher stocking densities of fish and improved water quality compared to ponds. There are different types of raceways made from materials like concrete, stone, fiberglass or polyester resin. Raceway structures should allow easy flow of water and be attached to streams, rivers or canals. The document describes considerations for different types of raceway ponds for fry culture, market production, and brood stocking. It also discusses concrete silo designs and requirements for effective raceway systems such as adequate water supply, aeration, waste removal, and productivity.

1. Waqas Mohyuddin
Roll number 1307014-089
M.Sc Zoology 4th semester
Presentation on raceway culture

2. 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.

3. 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

4. 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

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

6. raceway
Raceway pond
Canal or river
inlet
outlet

7. • Fry culture
o Depth should be 30cm
o Slope should be 1/100
o Width of raceway 1.5m
o Length of raceway should be 10-20m
o Inlet and outlet should be cover with gauze
• Market production
o Depth should be 60cm
o Slope should be 1/100
o Width should be 3m or less
o Length 10-30m
o 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

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

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

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

11. 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.