I think that you missed my point. I was only speaking about animal-to-animal HGT, which was the essence of the :
> Only last year did scientists first supply solid evidence of animal-to-animal horizontal gene transfer
It was a response to your original statement:
> This is no more likely than for other fish to get the same gene from the original jellyfish humans found it in. Unless there are close relatives of zebrafish in those streams which can cross-breed with the zebrafish, there is no chance of gene transfer.
I am aware of HGT within bacteria and viral domains. Science has done more to study those domains in part because the genomes are much smaller and are more plentiful. Additionally, for species within Kingdom Animalia, biologists have turned toward DNA Barcoding as an identifier rather than whole genome sequencing, which functionally limits the data available for investigation of such anomalies. Hence we really don't have good data on HGT between animal species.
> Only last year did scientists first supply solid evidence of animal-to-animal horizontal gene transfer
It was a response to your original statement:
> This is no more likely than for other fish to get the same gene from the original jellyfish humans found it in. Unless there are close relatives of zebrafish in those streams which can cross-breed with the zebrafish, there is no chance of gene transfer.
I am aware of HGT within bacteria and viral domains. Science has done more to study those domains in part because the genomes are much smaller and are more plentiful. Additionally, for species within Kingdom Animalia, biologists have turned toward DNA Barcoding as an identifier rather than whole genome sequencing, which functionally limits the data available for investigation of such anomalies. Hence we really don't have good data on HGT between animal species.