Selection and inbreeding of cultivated Macrobrachium rosenbergii in Thailand
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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.