alt Hacker News> There's plenty of freshwater fish that are farmed around the world. Trout, tilapia, etc.
Not to a level that could feed the entire country, surely.
Replies
Why? If you have the money, the equipment, and the climate, what's stopping you from shifting agricultural production from one good to another on any scale you like? It's often as simple as the government saying "you know what, from now on, we're subsidizing beans instead of corn".
Barring some planetary-scale cataclysm, most of Europe and the US are at no real risk of starving. There are other countries that are at a real risk, but the map doesn't make a clear distinction between "red as a matter of convenience" and "red because they physically can't do it".
If I read the study correctly the bar isn't to feed the entire population exclusively on fish, only to cover the expected ratio of fish in the diet.
No, but mostly for economic reasons. You can farm a whole lot of fish in aquaculture - it's just more expensive than importing wild caught fish.
The numbers look pretty insane, you can raise many tons of fish in relatively small volumes of water (several hundred kg of fish per year per cubic meter). You just gotta build the ponds/tanks/cages, and the infrastructure to filter the water, supply the oxygen and deliver the feed.