Growth of monosex hybrid tilapia in the labortory and sewage oxidation ponds. [Effects of water temperature, nutrient level, and. gamma. rays on growth]
Studies were conducted to evaluate the potential of monosex hybrid tilapia (female T. mossambica x male T. hornorum) in waste-heat polyculture systems. The optimum growth temperature for this hybrid was found to be 32/sup 0/C in laboratory experiments. Experiments in sewage pond cage culture in the temperature range of 23 to 33/sup 0/C at stocking densities of approximately 53 fish/m/sup 3/ were also conducted. At fish sizes between 5 and 12 cm TL, estimated annual production is approximately 50,000 kg/ha/yr (50,000 lb/acre/yr). Fish in the sewage oxidation ponds grew significantly faster than fish fed trout chow at optimum temperature in the laboratory, even though temperatures in the sewage ponds averaged below the optimum growth temperature. Techniques to accelerate growth rates are being explored. Exposure to gamma radiation (500 rads), known to cause significant increases in channel catfish growth rate, was found to have a similar effect on tilapia. After a 20-week growth period, exposed fish weighed an average of 20% more than controls.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 6686107
- Report Number(s):
- CONF-780152-1; TRN: 78-017496
- Resource Relation:
- Conference: Meetings of the World Mariculture Society, Atlanta, GA, USA, 3 Jan 1978
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
20 FOSSIL-FUELED POWER PLANTS
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ANIMAL GROWTH
BIOLOGICAL RADIATION EFFECTS
TEMPERATURE DEPENDENCE
AQUACULTURE
WASTE HEAT UTILIZATION
CONDENSER COOLING SYSTEMS
THERMAL EFFLUENTS
FISHES
PONDS
THERMAL POLLUTION
WATER POLLUTION
SEWAGE
NUTRIENTS
BIOLOGICAL EFFECTS
THERMAL POWER PLANTS
GAMMA RADIATION
STIMULATION
ANIMALS
AQUATIC ORGANISMS
AUXILIARY SYSTEMS
AUXILIARY WATER SYSTEMS
COOLING SYSTEMS
ELECTROMAGNETIC RADIATION
GROWTH
IONIZING RADIATIONS
POLLUTION
POWER PLANTS
RADIATION EFFECTS
RADIATIONS
VERTEBRATES
WASTE PRODUCT UTILIZATION
WASTES
553000* - Agriculture & Food Technology
520400 - Environment
Aquatic- Thermal Effluents Monitoring & Transport- (-1989)
200201 - Fossil-Fueled Power Plants- Waste Management- Thermal Effluents
560205 - Thermal Effects- Vertebrates- (-1987)
560152 - Radiation Effects on Animals- Animals