Fish gotta swim, birds gotta fly, and schedulers gotta schedule.

At their new website, Showbuzz Daily, former NBC scheduling chief Mitch Metcalf and his partner Mitch Salem have unveiled their predictions for the fall 2011-12 primetime schedule for all the broadcast networks.

Among the interesting tidbits: suggesting that NBC will not only push new reality hit “The Voice” (above) into the fall, but run it twice a week, at 8 p.m. Mondays and Tuesdays. More:

Mondays: After “The Voice,” NBC would put two rookie comedies in its troublesome 9 p.m. timeslot, followed by “Parenthood.”

Tuesdays: While CBS would remain stable, ABC, Fox and NBC would put a combined five hours of new programs between 9-11 p.m., including musical-themed “Smash” and, facing off at 10 p.m., “Pan Am” vs. “Prime Suspect.”

Wednesdays: ABC would put “Charlie’s Angels” at 10 p.m. after its comedy block and NBC would move “Biggest Loser” over from Tuesdays, but the headlines would go to Fox for its combo of ballyhooed new programs “The X Factor” and “Terra Nova.”

Thursdays: Just as it benched “Parks and Recreation” last fall, NBC would save “Community” this time around until midseason, while premiering “Whitney” at 8:30 p.m. CBS would move fading “CSI” off Thursdays to make room for “The 2-2” (fka “Rookies”).

Fridays: “CSI” would land at 9 p.m. after an 8 p.m. “Undercover Boss” and before “Blue Bloods” in its original timeslot. NBC would move “Harry’s Law” over from Mondays.

Sundays: “Good Christian Bitches,” or whatever its title ultimately will be, would land at 10 p.m. for ABC, while NBC prays for the NFL to settle its labor dispute.