Iron head is right on!

I worked on a project that was to build an algea raising farm in hawaii. The algea was grown and added as a suplement to farmed fish food to naturally enhance the color of the flesh. It was the same substances they get in the ocean.

O natural... Except for maybe the little bio engineering that was involved... J/k...

I personally think that without some sort of fish farming on a large degree we will either wipe out certain species of fish or totally disrupt the food chain and screw up every species of fish. My only concern is with the environmental impact. Something like this has to be in the ocean and near good currents to distribute the wastes over large areas.