A great overview of what feed ingredient alternatives are being researched as a substitute for costly fishmeal in fish feed. 
 
Discussion and research implications
The aim of this chapter was to provide an introductory overview to the main work being done on aquaculture feed compositions and illustrate that the industry are trying several approaches. In addition to the mentioned methods, there are also promising research being performed on gene modified soy beans (e.g. Monsanto), gene modifying carnivorous fish so it becomes more acceptable to vegetable proteins, development of new pharmaceutical nutrition supplements and enhancement of palatability of plant feedstuff. In addition, the Norwegian company Norferm is researching on a substance called Bioferm which is fish feed produced from natural gas, and they are experimenting with it in salmon diets.
 
Research on Alternative Raw Feed Materials | The Fish Site