Green Sturgeon (Acipenser medirostris) are found along the west coast of Mexico, the United States, and Canada.  Green Sturgeon are the most broadly distributed, wide-ranging, and marine-oriented species of the sturgeon family.  Green Sturgeon adults spawn in freshwater and these aggregations most often occur in the Rogue, Klamath, and Sacramento Rivers.  Males do not attain sexual maturity until at least 15 years of age and 1.4-2.0 m fork length, while females reach sexual maturity after 17 years of age and 1.6-2.2 m fork length.  Spawning periodicity appears to be every 2-5 years.  Green Sturgeon can weigh up to 160 kg, and the maximum ages of adult Green Sturgeon are likely to range from 60-70 years.  Juveniles are typically opportunistic (invertebrates and fish) and adults typically eat marine organisms (shrimp, crabs, etc.). 

 

Juvenile Green Sturgeon spend a few years in fresh and estuarine waters before they leave for saltwater.  Green Sturgeon are believed to spend the majority of their lives in nearshore oceanic waters, bays, and estuaries.  In the U.S., the Southern distinct population segment (DPS) was federally listed as threatened under the Endangered Species of Act in 2006.  The Northern DPS is listed as a species of concern.  The species are listed as a species of special concern under the Species At Risk Act in Canada. 

 

Green Sturgeon Rogue River By Molly Webb

Photo credit:  Molly Webb