If the migration of a species of fish is innate, then raising the offspring of a pair of these fish with parental fish of another species that migrates by a different route would not change the innate behavior. Therefore, the offspring would still migrate along the same route as their parents, even though they were raised with fish that migrate along a different route. This is because innate behaviors are genetically determined and do not depend on learning or experience. So, if the behavior is innate, we would expect the offspring to migrate along the same route as their parents, regardless of the environment they were raised in.