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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 AvailableProjectSelection and inbreeding of cultivated Macrobrachium rosenbergii in Thailand 1980
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No results found.This consultant's report was written in Bangkok under the sponsorship of FAO/UNDP project THA: 75/008, “Programme for the Expansion of Freshwater Prawn Farming in Thailand”. The report is based on biological data collected during November and December of 1980, on published material and on discussions with the staff of Bangpakong Fisheries Station, Chachoengsao province. Conclusions on inbreeding: In theory, a small hatchery-farm combination in Thailand could suffer a decrease in productivity o f up to 34% after about 7 years of inbreeding, but this is easily avoidable if such hatcheries occasionally exchange spawners and post-larvae. Hatcheries producing 1 million post-larvae or more per year will have no inbreeding problems. Conclusions on selection: Chachoengsao hatchery has been selecting large females as broodstock when practicable, but because spawners are often taken after the first harvest this selection has not been maximally efficient. Three alternative plans are suggested for increasing the intensity of growthrate selection. With an assumed heritability of 0.15 to 0.35, the most efficient controlled-breeding procedure might increase growth rate by up to 55% per year (if growth-rate variability is not unduly affected by behavioural interactions). Other plans are less efficient but easier to implement. A selection program should be initiated because the potential rewards appear to be great. -
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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