As long as their is a clear evidence that the concerned species was once blooming, sea ranching shouldn't possibly affect the ecological balance if the decline of this population was not due to re-structuring food web dynamics. This how it can be stated in general.
However, it really depends on the components involved in the ecosystem. So I guess It can bring benefits, harm or no gain no loss situation.
Most of the developing world have been steadily capturing animals from sea,without almost any in put. As the fishing pressure has gone out of control, it has put a big question mark on sustainability. The western world had come across this problem long time back & hence with stricter rules & regulations,the scenario
is still better. Some of them have taken this route of sea ranching their marine waters with the in put of specific type of animals,as per its niches,its food,natural mortality & pressure on fishing. With such a step they have been to an extent able to sustain natural populations & still land fish for local consumption & export. Infusing too much of a population, targeting fishes & marine animals from higher trophic levels will certainly alter ecological balance.But with such high levels of fishing pressure, do the developing countries have the wherewithal to correct the situation - I doubt.
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