Comment: I would like to dispel this myth

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I would like to dispel this myth

There are two types of "farming" at play here.

Statements like farmed fish and shrimp do not have as much nutrition or have too much ammonia are based on a type of fish farm that is, in itself, unsustainable. These farms keep the fish in tanks that rarely get their water changed. They cycle numerous generations of young and old fish through the same water while only adding to or recirculating a small portion of the water. This allows nitrates and many other things to build up, and causes developmental issues throughout the process. This. is. bad.

What Fishy is referring to is a system called aquaponics where all of the water is constantly filtered and nutritionally 'fed' by plants simultaneously growing in the course of everyday operation. This system actually eliminates more nitrates than a natural environment does and it makes that environment such that every minute is like the marine life were just then introduced to some paradise of food and health. This is why these systems typically have higher growth rates and if done really well, why they are actually much more nutritious than purely natural raised ones. It's not that anything is changed but rather that everything natural is constantly refreshed.

Coincidentally, the plants used in this cooperating system also see an increase in nutritional value, even though all fertilizing, herbicides, pesticides and other 'chemical' costs are eliminated. This makes growing them essentially free.

And of course, the aquaponics system can be further broken into two categories. One purchases commercial feed (with it's host of concerns) and one where the fish food comes from the on-site food chain. I believe the referenced suggestion above is the latter.

As an example of all this: A newish shrimp farm that does not recycle their used water without 'refreshing' it (via mechanical methods, not natural - so I won't promote them here) has been running surveys in their tour for a few years. They claim that almost no one in the US (sans the locals in the south) has tasted low-no ammonia shrimp in the memorable past. They claim that people can taste the difference immediately and that after doing so, people can't seem to stomach the high ammonia taste in store-bought shrimp. External reviews of this poll suggest it is valid.

What really needs to be encouraged in this discussion is that the total cost per pound of fish eaten for the 3 types (natural, commercial farm, integrated cycle farm) is lower by as much as 20-50% in that order. Unfortunately, the last option hasn't been successfully scaled up very large as of yet so there's no perceived big money in it.

TL:DR version - commercial farms bad... smaller and natural fish farms better and cheaper than even naturally grown and caught.