The white sturgeon, the largest freshwater fish in North America, may be protected as a threatened species, the California Department of Fish and Wildlife said.

The department is seeking comments on a petition to safeguard the fish under the California Endangered Species Act.

White sturgeon, which can live as long as 100 years, spawn in the large rivers of the Central Valley and mostly reside in the Delta and San Francisco Bay, the department said. They also sometimes range along the coast and enter bays and rivers, it said.

Threats include man-made changes to river flows, toxic harmful algal blooms, overfishing, poaching, collisions with large vessels and climate change.

The San Francisco Baykeeper, The Bay Institute, Restore the Delta and California Sportfishing Protection Alliance have petitioned the California Fish and Game Commission to list the white sturgeon as a threatened species.

CDFW is asking for comments to be submitted before Oct. 31. They can be mailed to California Department of Fish and Wildlife, Anadromous Fish Conservation and Management Program, Attn: White Sturgeon, P.O. Box 944209, Sacramento, CA 94244-2090. Alternatively, comments can be submitted via email; include “white sturgeon CESA” in the subject line.