The piece of evidence that BEST supports the author's claim in the article "Genetically Modified Salmon Can Feed the World" is:
If used carefully, genetic engineering can produce fish that reach the market much faster such as AquAdvantage Salmon states, and use less feed (fish meal).
This statement emphasizes the potential benefits of genetically engineered salmon, which aligns with the article's argument for the positive impact of genetically modified salmon on food production and sustainability.