Since there is no commercial fishing allowed in Antarctica, there are neither positives or negatives in response to your query.
The Antarctic Treaty prohibits commercial activities everywhere on earth south of 60 degrees South Latitude, which includes the Southern Ocean that surrounds the Antarctic continent.
bad
There is no commercial fishing in Antarctica.
Positives and negatives of conversation anywhere depend on who's conducting the conversation. This is also true in Antarctica.
The positive is: . there will be a lot of fish The negative: . The fish could be half eaten by other mammals . It could be bones . it can harm endangered mammals/fish
fishing fishing
There is no commercial fishing in Antarctica: it is prohibited by the Antarctic Treaty.
There is no commercial fishing in Antarctica.
There is no commercial fishing -- thus no 'over-fishing' -- in Antarctica based on the the Antarctic Treaty.
There is no commercial fishing allowed in the Southern Ocean around Antarctica.
There is no commercial krill fishing in the Southern Ocean that surrounds Antarctica.
There is no commercial fishing in Antarctica.
Earth south of 60 degrees South Latitude, which includes Antarctica, is governed by The Antarctic Treaty, which dedicates the area to science. There is zero fishing in Antarctica, except in pursuit of science.