The trout (tiger, cutthroat and rainbow) now share the reservoir with high densities of Utah chub. The reservoir is thick with chub – a carp-like fish that matures quickly and is extremely prolific. At times chub have outnumbered trout in Scofield Reservoir nine to one.
The main concern for fisheries managers is whether or not the growing population of chub will compete with sport fish for food and/or space, as has been observed elsewhere, or whether chub can be effectively controlled by trout populations.
According to Gary Thiede, fishery biologist in the Department of Watershed Sciences, once the trout begin eating chub they grow rapidly. Tiger trout in particular grow to very large sizes eating a diet of 100% chub.
DWR has used three trout species to control the population of chub and also enforced a catch and release rule for larger cutthroat trout so the biggest predators would remain in the reservoir. But since chub can live up to 30 years, some of the adults have reached a size where they are too big for trout to eat.
After an extensive public input process, of gathering over 2500 public angler surveys, a committee was formed comprising of Scofield residents, sportsmen organizations, and wildlife agencies to develop a management plan, which would provide DWR recommendations to control the Utah chub population and create a sustainable, high-quality fishery at Scofield.
The first step in the plan will be DWR introducing three new fish to Scofield: wiper (a hybrid of white and striped bass), tiger muskie and triploid walleye.
According to Chris Wood, the southeastern regional supervisor, “All three grow quickly and have an appetite for the Utah chub.”
Justin Hart, the DWR’s aquatics manager in southeastern Utah said, we don’t want to completely eliminate [the chub], but we do need to get their biomass down. We plan to use the chub to grow some big fish.
Once the chub population has dropped, DWR will resume stocking the rainbow trout – a favorite among the state anglers.
If the plan is successful, the chub population will remain at a sustainable level and be a benefit, instead of a burden to the Scofield Reservoir trout populations.
This is Shauna Leavitt for Wild About Utah.
Credits:
Photos: Courtesy and Copyright
Photos: Courtesy and Copyright
Text: Shauna Leavitt
Sources & Additional Reading
Leavitt, Shauna, Trout vs. chub, Determining the effect Utah chubs have on Scofield trout populations, July 15, 2014, https://wildlife.utah.gov/news/wildlife-blog/732-trout-vs-chub.html