The correct option is "D" Migration.
Since the term aquaculture mainly refers to the cultivation of aquatic organisms in controlled aquatic environments for any commercial, recreational or public purpose. whereas external organisms are added to an ecosystem in order to raise their number keeping in mind the availability of food for them.
For the creation of new aquatic ecosystem cargo ship hulls, recreational boats, organisms escaping from the aquariums can be useful as these methods are non-natural and are disturbing the original productivity and stability of the ecosystem.
Migration is a natural phenomenon in which non-native organisms move to another habitat in search of food required for survival.
Thus, Migration is not a way that nonnative organisms are introduced to new aquatic ecosystems related to commerce.
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