Here is a section from that tutorial (https://www.sci-nevada.com/utswancourse/9.asp)
Nature of the controversy Continued growth and broader distribution of swans is a goal of the current management plan for Rocky Mountain Population Trumpeter Swans. Some biologists believe that the current wintering areas are near or soon will be at maximum capacity to provide food and habitat for this population of swans. Utah is a likely spot for future range expansion, and some argue that the swan hunt in Utah should be closed in order to encourage trumpeter migration through Utah. In addition, some stakeholders believe the harvest of even one Trumpeter Swan is detrimental to efforts to expand the range of Trumpeter Swans.Some groups also believe that more Trumpeter Swans are being harvested than are being reported by hunters. Data gathered by the Utah Division of Wildlife Resources suggests that in most years from 0 to 2 trumpeters are taken annually in Utah's swan hunt. The Utah Division of Wildlife Resources and the U.S. Fish and Wildlife Service do not believe this level of harvest is harmful to the Trumpeter Swan population.
Stephen