The difference being that there is no artificial intervention in the actual selection process, by means of those tanks. That is, to show there is no external “intelligent” designer behind the adaptations.
With dogs, the breeder specifically chooses the mating partners.
“For several years, he and his students have been crossing and combining varieties of sticklebacks, throwing them in the ponds”
Yeah, this is a BREEDING PROJECT.
Of course you can get varieties of fish!!
Sheesh these evolutionist religious nutballs are so crazy to shove their religion down our throats.