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Pen raising saltwater fish has its own problems.As has already been shown with farm raising salmon these fish by virtue of being raised in pens are genetically inferior to their wild counterparts.
These fish have been known to escape in enough numbers and interbreed with wild populations and introduce their infererior genentics into the general population.This can cause a host of problems mainly which is the newborn fish are prone to disease.
Don't get me wrong farm raising fish is a good thing but its techniques need to be vastly improved.
Obviously fish farm raised soley in self contained freshwater ponds don't apply.
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