From the Fishing Guidebook:
Utah Admin. Rule R657-13-13
Possession of the following nongame fish is prohibited. If you catch any of these fish, you must release them immediately:
• Gizzard shad
Willard Bay Reservoir, Box Elder County
• Limit 10 crappie.
• Limit 6 walleye, only 1 walleye may be over 24 inches.
• Limit 3 wiper.
• Possession of gizzard shad, dead or alive,
Shad may work well as bait, but the Gizzard variety ain't legal. I guess you'll just have to use something that looks like them.
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"The difference between genius and stupidity is; genius has its limits."
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