As approximately 66% of the Mekong fish species are migratory their passage will be blocked by the dam in its current design which will seriously reduce the reproduction rate and overall fish populations downstream will be reduced.

CNN: STORY HIGHLIGHTS

Although their higher rate of reproduction favours them at first, they easily become extinct when faced with a hazard to which all their members are genetically susceptible.

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Dr Mohamed Taranissi is director of the Assisted Reproduction and Gynaecological Centre in London - which has a live birth rate, as opposed to pregnancy rate of 40% - compared with a national average of 17 to 19%.

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