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The fishmeal and fish oil industry have embraced sustainability – over 40% of the global production is already certified as responsibly sourced. This far exceeds the sustainability claims of other feed ingredients. As the previous commentator mentioned, the aquaculture industry has been growing just fine by using the same quantity of fishmeal and fish oil to make more and more feed so dressing this up as a problem of sustainability or of restricting the feed industry is just wrong. The real problem is finding new feed ingredients AS WELL AS fishmeal and fish oil, not instead of.
If you look at fish meal production over time, it has been flat (constant) for about 40 years while aquaculture has grown 10 times to the largest, user while chickens and pigs have used less. With no correlation between fish meal production and aquaculture, where is the case of a problem. Since when do market shifts say something about the environment? It is all activist fundraising that created this imaginary link between fish meal and aquaculture (it is simple minded enough to sell well).
All animal diets are really formulated by competing linear programming models. Rick Barrows has created vegan diets that outperformed fish meal control diets with marine carnivorous fish, but they are more expensive. It is just economics. Fish meal is lower cost than things like corn gluten meal, that are interchangeable in the diets.