From the history of genetic improvement in aquaculture,
particularly that for Atlantic salmon in Norway (footnote 14), ICLARM
and its partners had anticipated that selective breeding would be the
more appropriate strategy for the development of GIFT. However, it
was also necessary to explore the possible advantages of
crossbreeding among the eight assembled Nile tilapia strains. This
required another experiment on a scale never before undertaken in
Asian aquaculture. The weights at harvest after 90 days of all 64
possible pure- and crossbreeds among and within the four African
and four Asian strains were measured in different test environments,
again including ponds and cages as well as lowland and upland
locations. This involved the tagging of 23,000 individual fish. Hybrid
vigor (harvest weight advantage of crossbreeds over parents) was
low (average 4.3%) and significant in only 22 crosses, of which only 7
From the history of genetic improvement in aquaculture,
particularly that for Atlantic salmon in Norway (footnote 14), ICLARM
and its partners had anticipated that selective breeding would be the
more appropriate strategy for the development of GIFT. However, it
was also necessary to explore the possible advantages of
crossbreeding among the eight assembled Nile tilapia strains. This
required another experiment on a scale never before undertaken in
Asian aquaculture. The weights at harvest after 90 days of all 64
possible pure- and crossbreeds among and within the four African
and four Asian strains were measured in different test environments,
again including ponds and cages as well as lowland and upland
locations. This involved the tagging of 23,000 individual fish. Hybrid
vigor (harvest weight advantage of crossbreeds over parents) was
low (average 4.3%) and significant in only 22 crosses, of which only 7
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