That's really interesting. I listened to a story on the radio about fish farming. It was an interview with a writer that just wrote an article for Time Magazine on aquaculture. They discussed raising large, top predator fish like tuna on farms, but said that it wasn't possible because of the huge amount of small forage fish that would be required. The way I understood it, it wouldn't be economical because the amount of money it would take to catch and feed the amount of forage fish needed to raise a tuna wouldn't produce enough tuna meat to make it profitable. Plus, is there any concern about getting around the biological needs of those fish to swim great distances - which I would imagine would have a direct connection to their physical condition and meat quality? Salmon are raised, so I guess its possible, but I also know salmon farms have a lot of issues regarding huge amounts of waste (similar to a livestock farm), and parasites within the farm raised that can get out and infect wild populations.
The coolest thing was they also discussed cutting edge sustainable fish farming where the farmer basically creates a mini ecosystem with multiple species of food organisms being raised. The idea is that they each balance out some of the environmental concerns. For example, a farmer would raise fish, lobster or crab, maybe mussels or something - all in one "farm." So the crabs may pick up left over food that is fed to the fish and would otherwise foul the water, and the mussels would be filter feeding and hopefully improving water quality further.
It would be great to hear your thoughts on this stuff. I bet aquaculture is going to be a growing industry and I hope we can get it off on the right foot and keep environmental concerns and sustainability in mind. From national parks to marine reserves....cattle farms to tuna farms....
Thanks a lot!