Why can’t fishmeal be completely eliminated from the diets of some aquatic animals?

Using species-appropriate feeds in aquaculture is animal welfare friendly, but may conflict with efforts to provide sustainable feeds. 

While some cultured fish species are suitable for pure vegetarian rearing, other species require essential nutrients contained in fishmeal for their health, growth and welfare. Fish species such as salmon or trout cannot be raised in an animal welfare-friendly manner without these nutrients.

Intensive research is currently being carried out to gradually substitute fish meal and fish oil in feed without causing animal welfare problems. The aim is to find suitable alternatives that are compatible with animal welfare and also ensure appropriate growth. For example, attempts are being made to provide the necessary essential nutrients by additionally feeding certain algae.