Wild salmon are genetically different from one river to the next, and the fear of crossbreeding with strays will erase the river-specific characteristics necessary for long-term survival.
(Wild salmon; are; genetically different from one river to the next) (the fear of crossbreeding with strays; will erase; the river-specific characteristics necessary for long-term survival)
Wild salmon the fear of crossbreeding with strays
are will erase
genetically different from one river to the next
the river-specific characteristics necessary for long-term survival