Very well said fishNphysician.
It is understandable that all of us here in the NW are focused on the Salmon Aqua Culture industry. We all at first thought it would be an answer to save wild salmon. One thing we must remember that Salmon Aqua Culture as large of an industry that it is and will become is small in comparrison to other types of aqua culture around the world. I beleive that the shrimp industry is far larger. Throughout South America and SE Asia this industry has become the most devesting thing that has ever happened to our warm water oceans. 80% of the shrimp sold world wide is from Aqua Culture. Shrimp aqua culture is done in the worlds costal mangrove swamps. To make the shrimp pens used in raising farmed shrimp acres of mangrove trees are bulldozed each day. One bulldozed area will only support about 18 months of shrimp growth before the diease factor comes into play due to pollution. The industry just moves on to bulldoze new areas to raise shrimp. The mangrove swamp is the key breeding grounds and natural rearing grounds for the top of the food chain warm water fish and a majority of the worlds forage fish. Reports from some of the central and South American forage fish industry are saying that in the last few years whole spiecies of forage fish have disapeared off shore. That they just never migrated to open ocean because they no longer existed in the first place.

Just one more thing about industrial aqua culture. A lot of us some how think that it can feed the world. This it can not do, the amount of calories used to the amount to be consumed by humans does not fit in the ratio guide lines to make the food inexpensive enough to help feed our worlds problem areas. The best industrial aqua culture can do is bring a moderatly price product to the first worlds middle class income bracket. I'm not sure it's worth it for what it will continue to do no matter how many changes the industry makes. I strongly believe in aqua culture but it has to be localized to feed the population who grows it. That is the only way the calorie to calorie ratio makes sense.