Hi Theo:
No reason at all, they just come as part of an advertised complete stocking package as part of a discounted deal vs ordering fish separately. Is there something I should know? All I know about them is they are a Japanese ornamental that feeds on Algae do they have potential for any kind of problem in a basic conservative LMB BG pond? It would be easy enough to delete them also at this time and add them later at a larger size if I have any algae problems
Also does anyone have any comments about the package as modified? I have fished a fair number of ponds but this is the first one I have ever built, stocked or owned.