I've been in sea fish farms and I'm a spearfisher hobbyst myself.
Beyond the notion that fish farms are a sustainable source of fish meat, the fact is that fish farming needs a fodder supply to feed the fish. Fish eat fish, remember? This means in its majority the fodder produced nowadays comes from wild fish, probably a cheaper one to catch than de one in the farming nets. So wild fish still needs to be catched.
But it's even worse than that. Much worse... In order to grow fish in the farming nets the fish needs to eat much more than its weight in order to grow a little,just like any other animal. This means that it is much more ecological for us to eat the fish that is processed to make fish flour (fodder) than eat the fish that comes from fish farms.
What a nonsense isn't it? But still, we want tuna...
> Beyond the notion that fish farms are a sustainable source of fish meat, the fact is that fish farming needs a fodder supply to feed the fish.
This is not the only model. There are fish, specially freshwater, you can feed on algae and micro crustaceans, which in turn consume organic waste from traditional farming. That's where research is going into, and where fish farming is more promising, not the sea net model.
Tilapia is produced in large scale this way quite successfully, and is a desirable meat that sells for a good price here in Brazil.
Beyond the notion that fish farms are a sustainable source of fish meat, the fact is that fish farming needs a fodder supply to feed the fish. Fish eat fish, remember? This means in its majority the fodder produced nowadays comes from wild fish, probably a cheaper one to catch than de one in the farming nets. So wild fish still needs to be catched.
But it's even worse than that. Much worse... In order to grow fish in the farming nets the fish needs to eat much more than its weight in order to grow a little,just like any other animal. This means that it is much more ecological for us to eat the fish that is processed to make fish flour (fodder) than eat the fish that comes from fish farms.
What a nonsense isn't it? But still, we want tuna...