"...The industry is not without controversies. Densely stocked ponds and pens cause environmental problems, notably the release of organic materials, which promote algal blooms and the introduction of salmon that have been genetically modified to grow faster and use food more efficiently. But fish farming is now a global business worth more than US $250 billion a year, and it will keep expanding, introducing new species to more consumers willing to pay for their favorite fish, crustaceans, and mollusks." (IEEE Spectrum, 29 April 2021)