On January 27th 2021, we went to Lillafüred to sample the triploid rainbow trout that were transplanted with brown trout spermatogonia three years ago as well as tiger trout that were transplanted with rainbow trout spermatogonia as adults. The triploids have grown to an enormous size, some females were close to 5 kg in weight. Results of the transplantation will be verified by histology as well as using molecular markers.
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| A triploid rainbow trout female transplanted with brown trout spermatogonia |
Gyuri, the owner of the farm has also shown us the fish that were the result of the first successful transplantation of rainbow trout spermatogonia into tiger trout recipients. Sperm stripped from one of the tigers was used to fertilize rainbow trout eggs and as the photos show, the progeny are completely normal rainbow trout. Many of the males are already sexually mature and produced sperm that was used for regular fertilization.
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| A fish hatched from rainbow trout eggs fertilized with sperm stripped from a tiger trout recipient |
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