Another thing you can supplement with is Farmer's Helper Ultra Kibble, it has fish meal in it. It is also now soy free. My chickens & guineas love it, but it is pricey! It so much easier than giving them fish meal or fish, but your idea sure will work!
I just read last night also that fishmeal is superior to flax for omega 3s. I think I will finally go back to the local guy who sells freshly ground mash using fertrell minerals etc. I do not like that the 17% layer does not have fishmeal and I am tired of going thru so much oyster shell, so I...