I think the real challenge is that we need a lot of information to make inferences on how wild stocks are being affected. In order to study the impact of something like aquaculture or any anthropogenic activity on the environment, we must first have a thorough understanding of the baseline conditions. This can only be achieved with continuity in research funding to appropriately monitor the environment in space and time. Of course, there are a lot of things that need to be thought about in that regard, but once we know what the baseline conditions are, we can start looking at how any industry impacts the environment.
I think one of the biggest challenges in assessing the impact of current aquaculture practices is not really having sufficient information on which to draw solid conclusions. There's always a danger in looking at correlations of inferring cause and effect without fully understanding the system you're looking at. What we need to get at that is funding to maintain the capacity to monitor, but also to quickly deploy scientific expertise to address critical issues as they arise, because they do vary depending on the system.