Theses and Dissertations


Title: Effects of Tilapia aurea (Steindachner), cage culture, and aeration on channel catfish Ictalurus punctatus (Rafinesque), production in ponds

Name: Smith, Paul Lee

Degree: PhD

Chair: Dr. R. Oneal Smitherman

Resides: FAA Library

University: Auburn

Location: Auburn, Alabama

Date: 1973

Pages: 124

Keywords: Tilapia aurea (Steindachner),Cage Culture,Aeration,Channel Catfish.

Abstract:

The effects of stocking Tilapia aurea (Steindachner), cage culture, and aeration on channel catfish Ictalurus punctatus (Rafinesque) production were evaluated over a two-year period in 0.1 acre earthen ponds. In the 1969 experiment, one tilapia stocking rate of 6000 per acre was compared with a control of 0 tilapia per acre in treatment units containing 10,000 channel catfish per acre. The addition of 6000 tilapia per acre did not significantly increase catfish production even though the catfish-tilapia treatment received a mean of 1330 pounds/acre more feed than the control. The lack of increased catfish production in the catfish-tilapia treatment was attributed to competition between catfish and tilapia for feed. Total mean net production of catfish and tilapia in the catfish-tilapia treatment (6376.3 pounds/acre) was significantly higher than the total mean net production for the control (3725.0 pounds/acre). The highest maximum safe daily feeding rate of 70 pounds/acre/day was attained in the catfish-tilpaia treatment, and was double the normal recommended maximum daily feeding rate for catfish. In the 1970 experiment, two tilapia stocking rates of 3000 and 500 per acre were compared with a control of 0 tilapia per acre in treatment units containing 7000 channel catfish per acre. The highest mean net catfish production (4,725.2 pounds/acre) was obtained in the treatment containing 500 tilapia per acre and was significantly higher than the control (3,669.2 pounds/acre). The use of cage culture did not increase catfish production. Further, survival of catfish in cages was lower than survival in ponds because of localized oxygen depletions in cages. Aeration of ponds containing 7,000 catfish/acre allowed increased daily feeding and consequently resulted in increased fish production. A mean net production of 4,598.9 pounds/acre was obtained in aerated units as compared to a mean net production of 3,999.4 pounds/acre in control ponds. Feed conversions for catfish in 1970 were similar among aerated and nonaerated units, and cage and noncage units. However, units with 500 tilapia per acre had more efficient feed conversion than units containing 0 or 3000 tilapia per acre.

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