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No Thumbnail AvailableProjectThe effects of paddlewheel aeration on the pond production of associated natural food organisms under the monoculture system of Macrobrachium rosenbergii (de Man)
Establishment of a Network of Aquaculture Centres in Asia
1986Also available in:
No results found.The effect of using two paddlewheel aerators (1 HP each) in Macrobrachium rosenbergii monoculture pond of 0.56 Ha area was not affective to influence plankton growth and benthic organisms biomass, while fluctuation of dissolved oxygen level between in the day and the nighttime is a broaden. Closed correlation between dissolved oxygen with Chlorophyll a concentration increased concurently with phytoplankton abundance in pond water. Organic matter particulate in pond bottom decreased followed by the increment of benthic organisms. Great increment of organic matter due to the abundance of phyto and zooplankton in the pond water was occur. The dominant of zooplankton groups is Rotifer, while the phytoplankton and benthic organism groups was dominated by Cyanophyta and Chironomid respectivelly. Oscillatoria, a blue-green algae is a most common phytoplankton genera found in prawn monoculture pond; however the prawns have difficulty in digesting them. Blooms of blue-green algae have an in fluence growth and mortality of prawn. To increase the profitability in prawns monoculture and eliminated algae blooms, low stocked planktovirous fish is recomended. 1) Research sponsored by FAO/NACA under the secondment for Young Scientists Programme. Bangkok-Thailand, Octorber 1985 - September 1986. 2) Staff Officer of the Freshwater Agriculture Development Center. (Balai Budidays Air Tawar), Sukabumi 43101, PO Box 67, West Jawa-INDONESIA. -
No Thumbnail AvailableProjectThe effects of paddlewheel aeration and stocking density on water quality and production of Macrobrachium rosenbergii (de Man) under monoculture system
Establishment of a Network of Aquaculture Centres in Asia
1986Also available in:
No results found.The effects of aeration and stocking density on water quality and production of Macrobrachium rosenbergii were examined in six 0.54 ha ponds in Nakhon Pathom province, Thailand, during a grow-out period of eight months. The experiment comprised three treatments; T 1) 20 prawn/m2 stocking density with aeration, (T1), 2) 20 prawn/m2 stocking density without aeration (T2), 3) 10 prawns/m2 stocking density without aeration (T3). The ponds of treatment 1 were subjected to the aeration by means of ele ctric-powered paddlewheel aerators, after 3-months of stocking. Prawns were fed a formulated pellet feed once a day approximately at the rate of 5% of body weight. Prawns were partially harvested 3 times before total harvest. In all the ponds, the survival rates were very low (T1=18%, T2=15%, T3=18%). Because of the heavy mortality occurred during the grow-out period, much desired data could not be collected. However, when the collected data were statistically analyzed no significant differe nces were observed between the treatments with and without aeration or with varying stocking density on water quality and survival rate. Production was low in low density (551 kg/ha) compared to the high density (876–894 kg/ha). Mortality occurred during the experimental period was mainly due to sudden falls of temperature, high rates of liming, and DO depletion. Oxygen depletion was resulted from phytoplankton blooms and their sudden die-offs due to heavy rainfalls. Paddlewheel aerator used, proved to be insufficient to raise the DO (water depth 1 meter) level at such time. -
Book (stand-alone)The potential of farming tilapia (Oreochromis niloticus) and freshwater prawn (Macrobrachium rosenbergii) in Vanuatu 2004
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No results found.Under the auspices of the Food and Agriculture Organization of the United Nations (FAO) Sub-Regional Office for the Pacific Islands (SAPA) in Samoa, a feasibility study on farming tilapia and prawns was undertaken by SPC Aquaculture Office in November 2003. The objectives were to survey the potential to develop Tilapia (Oreochromis niloticus) and Prawn (Macrobrachium rosenbergii) farming in Vanuatu (further details are given in the Terms of References in Appendix 2).
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