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Based on my humble understandings:
Mealworms do no consume a lot of water and their farming does not take up much space and can be converted to protein powder quite easily but from what I have seen all they can eat are grain byproducts (which here in Morocco we actually eat such as wheat bran and the like. Meaning they compete with humans and other animals[cattle, sheep, chickens] for the same resources...at least here). It also means they indirectly consume a large sum of water since these grain byproducts had a large share of the irrigation water. Additionally wheat bran in not cheap at all from an economic perspective. (here it is $0.18 to $0.2). NOTE: Mealworms optimum FCR is 2. Mealworm protein content is 20% (from grubco website). so almost 9-10 kg of wheat bran is needed for 1kg of pure protein powder. So just the feeding of the larvae would cost nearly $1.6-1.8. Here, that is much more expensive than fishmeal.
BSF consume organic waste that should have certain constituents which is a great sustainability opportunity. However, the logistics of retrieving organic waste should be well studied since you might be harming the environment in other ways. They use a lot of space and from what I have read no clear method of de-fattening them has been found.
So in order to make both these options sustainable options and commercially viable:
Do you believe there is a future of de-fattening BSF efficiently? Do you believe there is a way to retrieve organic waste efficiently? Do you think that there is a possibility that mealworms can eat organic waste rather than grain byproducts?
Hopefully I am wrong in some of my assumptions above and that there already have been breakthroughs in some of the issues raised here.
Cant wait to hear your opinions and take on this.