The switch between topics shows that the relation of the decline in Wild salmon population and the rise in domesticated salmon population is that humans are trying to make up for the over fishing and the blocking of major salmon streams. This then opened a market for breeders to domesticate salmon and make profit there. So the decline of wild salmon population is the cause for the rise in domesticated salmon. The author also suggests that the introduction of domesticated salmon has caused the decline in wild salmon even further. With this said in my mind a huge reason is because domesticated salmon are not “fit” for the wild and will not travel back to spawn in certain streams causing them to die off without reproducing. They do not have the “homing-senses” of the wild salmon and when they breed with wild salmon they can pass on that same problem to their offspring.