Answer:
AquAdvantage salmon were developed in 1989 by the addition of a single copy of the opAFP-GHc2 construct, which consists of a promoter sequence from ocean pout directing production of a growth hormone protein using the coding sequence from Chinook salmon.Explanation: how did they improve salmon through genetic engenering? Over a quarter of a century ago, a construct that contains a snippet of DNA encoding a growth hormone from the king salmon connected to DNA regulatory sequences from the ocean pout was added to the eggs of an Atlantic salmon spawn.