151.490 and 151.445 are AZ G&F regional nets. I heard that these regional nets were going to be eliminated. Three of the four states I've lived in (AZ, NM & NV) only have one statewide frequency for their game and fish agencies. California utilizes only two with about half their regions on one frequency and half on the other. These agencies also have simplex, tactical frequencies licensed and in use.In the Kingman District in the not too distant past I have heard Game & Fish traffic on 151.490R with 159.225 as the input. Although not verified simplex traffic has been reported on 151.340. From Kingman I have also heard 151.445R which is the Flagstaff District and some simplex traffic on the same frequency.
Simplex traffic can be somewhat informal at times.