[Derek Roxborough]

will trutta laidonensis be able to breed with Trutta Trutta, or any of the other truttas,? Naturally of course, if this is the case then surely it's the same? or am I being naïve? perhaps the earlier " Observers Book of British Fishes" was the Victorian version? with all the different  types,,  , Derek Roxborough

[Andy MacArthur]

Lions and tigers can breed a produce fertile offspring?  Would  you  say they were the same species Derek?
As previously mentioned the old concept of species isn’t a ‘catch all’ and definitions have changed and evolved to reflect this.

[Derek Roxborough]

Both felines, may be it's a stripey thing, I thought that Ligers or Tigons were sterile, but there you go, that's what engineers think, Derek Roxborough

[Terry Coging]

We should stick to being engineers Derek and try to baffle the biologists