>When you select crops over generations to improve a seed stock you are not making radical changes quickly, and you are not introducing genes from other species.
Non-GMO breeding methods can also mutate rapidly. One example is mutation breeding, where a plant is exposed to high levels of radiation to encourage rapid mutation. This does not require any labelling.
It's worth bearing in mind that there is no such thing as a "fish gene", or "strawberry gene". They're just genes. All forms of life have considerable overlap between them.
Non-GMO breeding methods can also mutate rapidly. One example is mutation breeding, where a plant is exposed to high levels of radiation to encourage rapid mutation. This does not require any labelling.
https://en.wikipedia.org/wiki/Mutation_breeding
As for genes from other species, this is known as horizontal gene transfer and it actually does happen in nature. It's even occurred in humans.
https://en.wikipedia.org/wiki/Horizontal_gene_transfer
It's worth bearing in mind that there is no such thing as a "fish gene", or "strawberry gene". They're just genes. All forms of life have considerable overlap between them.