a few genes from other fish
Echoing JEGallegos, this phrase is misleading. Only one gene from Chinook salmon was used along with the regulatory DNA sequences from Ocean pout.
A few fun facts about Ocean pout: it's an eel-like fish that lives in predominantly cold waters of the Atlantic. The DNA they used from Ocean pout are from an antifreeze gene that gives the fish the ability to survive in cold conditions without their blood freezing (*an artificial version of this protein has been used in ice cream to prevent ice crystals from forming).
So, to sum up exactly what the DNA integrated into Aquadvantage salmon includes: the promoter sequence (turns the gene on) from the Ocean pout antifreeze gene--the growth hormone gene from Chinook salmon--the ending sequence from the Ocean pout antifreeze gene (the stop signal). Definitely not a few genes. Also, the gene and regulatory sequences they used were not "thrown in" since the process requires numerous and precise checks at every step along the way. (see Yaskowiak ES. et al. 2006 for a detailed characterization of the transgenic DNA used)