Frequently Asked Questions
Detroit River Juvenile Lake Sturgeon
Spatial ecology of juvenile lake sturgeon (Acipenser fulvescens) in the Detroit River
July 2017 - July 2021
Improved understanding of the movements and habitat use of juveniles is needed to improve habitat restoration planning for lake sturgeon for Lake Sturgeon (Acipenser fulvescens) in the Great Lakes. Compared with adults, much less is known about the movements, dispersal, and habitat selection of juveniles, but this information is critical for identifying habitats for protection, designing and siting habitat restoration projects that meet the needs of individuals throughout ontogeny, and for monitoring juvenile abundance in response to habitat enhancement projects. The Detroit River is an international area of concern (AOC), but supports a remnant Lake Sturgeon population that has been the focus of numerous habitat restoration projects. Juveniles in the system are known to inhabit only two areas, one in the lower river (the “river” site) and one in Lake Erie at the confluence with the river mouth (the “lake” site). The primary goal of this project is to determine if these locations represent isolated patches of nursery habitat used by different groups of juveniles or if juveniles use both the river and lake sites on a seasonally recurring basis. A second goal is to understand whether juvenile site fidelity is better explained by the “restricted range” or “home-range shift” hypothesis. To address these questions, juvenile Lake Sturgeon were captured at the lake site during 2017-2019 and surgically implanted with acoustic tags. Half the individuals were released at the site of capture while the remaining half were translocated to the river site or a second lake location. Both translocation sites are located 10 km from the lake (i.e., capture) site. Movements of acoustic-tagged juveniles monitored on a network of acoustic receivers throughout the Detroit River and Lake Erie then were used to address the objectives below.