They should be a great food for your fish. Not sure I would like to live near you if most of them are not fed to your fish since there would be a lot of mosquitoes flying nearby. The only other problem is dragonfly larvae, which can only be a problem in a fry tank. Big fish will eat dragon fly larvae too.
One other problem occurs if you overfeed mosquito larvae and not all the mosquito larvae are eaten and then emerge as flying mosquitoes in you fish room and home.
Perhaps you should culture daphnia in your pool. If you get a good dense daphnia culture growing in the pool then female mosquitoes will not lay their eggs there and you will not be raising mosquitoes in your pond. Apparently female mosquitoes can smell whether the water has enough nutrients to support their babies. But the daphnia culture must be going well for this to happen. Decaying leaves and other decaying stuff are what is feeding the mosquito larvae (or daphnia).
BTW blood worm larvae look much like mosquito larvae and in this area you are likely to have both.
https://en.wikipedia.org/wiki/Chironomidae The flies from blood worm larvae look like mosquito larvae but do not fly away when you see them on a structure, so you can easily kill them compared to mosquitoes.