Non-native fish continue to threaten native species in the Grand Canyon area, and the National Park Service is looking for public comment on a plan to manage the situation.

The Park Service hopes to expand its management plan for non-native aquatic species in Grand Canyon National Park, along with the section of Glen Canyon National Recreation Area that's below Glen Canyon Dam. Its expanded management plan and environmental assessment are open for public input through January 5.

An expanded plan is needed, the Park Service says, because of an increase in green sunfish and brown trout, two non-native species, in these areas. Additionally, the agency says, other non-native aquatic species have become an increasing threat to native species since other management plans were completed in 2013 and 2016.

The plan is in the scoping period, meaning this is an opportunity for the public to weigh in early in the planning process. The Park Service will host a webinar November 28 — plus open houses December 6 at Glen Canyon National Recreation Area, December 7 in Flagstaff and December 12 in Phoenix — to provide more information on the proposal and solicit feedback.

For more information on the proposal and the public meetings, or to comment electronically, visit this link.