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No Thumbnail AvailableProjectAn assessment of the performance of Macrobrachium rosenbergii fed simple non-vitamin-supplemented pelleted diets 1980
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No results found.Freshwater prawns are usually grown in earthen ponds where a variety of natural food is stimulated by fertilization, either directly or by feedstuff supplementation. Enquiries are received however as to the possibility of rearing Macrobrachium rosenbergii in concrete ponds. Pelleted diets with three protein levels (15%, 25% and 35%), derived from those formulated for a parallel experiment in commercial earthen ponds (New, M.B., 1980) have been tested in concrete ponds at this Institute. No attem pt to modify the diets to provide a complete ration was made, for comparative purposes, and no vitamin supplement was provided. Growth, production, survival and feed conversion of prawns fed 15%, 25%, 35% protein diets and broiler starter feed were not significantly different (P>0.05). The protein efficiency ratio of the prawns fed 15% protein diet was also not significantly different but appeared better than the other diets. This suggests that the 15% protein diet may be a desirable formula f rom a economical standpoint, at least for the first four months of rearing. The absence of a vitamin mix did not appear to cause problems but it is not yet known whether its inclusion would improve the performance of any of the test diets. -
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
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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 culture of the giant freshwater prawn (Macrobrachium rosenbergii de Man) in Cuba. Report of the first technical assessment mission, May 7th - 30th 1990 1990
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No results found.The Cuban government wish to expand the tourist industry as a sorce of much needed foreign exchange. Opportunites to supply and support the industry are actively being sought and include the provision of fish and shellfish foods from fisheries and aquaculture to supply the hotel and restaurant enterprises throughout the designated tourist areas. The culture of the Giant Freshwater prawn (Macrobrachium rosenbergii) is one such Trials are being made with pond reared stock using three methods to improve breeding; i) eyestalk ablation; ii) photoperiod manipulation; iii) artificial insemination. In the hatchery larvae are fed algae followed by minced clam, squid, marine fish and Artemia but Nippai prepared feeds are also used. A nursery phase is employed lasting 30–40 days which takes the shrimp from 5–10 day old post-larvae to 0.5 to 1.0 g juveniles. Stocking rate is 100/sq m but trials, have been made with 1000–2000 in 70 t tanks. In the on-growing phase shrimp are stocked at 5/m2, feed is given at from 15 to 2.5% per day and salinity is 25%. Feed costs around 200–250 pesos per tonne and contains squid, shrimp meal (from processed P. schmitti caught at sea) and zeolite. Problems with unstable artificial feed are common. Production is around 400–500 kg/ha/cycle and at present there are 1.6 to 1.7 cycles/yr. Newness of the ponds, inexperience and climatic changes are constraints on production. Early trials with P. notialis were not encouraging as growth stopped at 6–8 g, howev er new trials may be undertaken.
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