In 2001, a consortium of partners began working to mitigate for historical habitat losses by creating fish spawning reefs made of rock rubble placed on the river bottom. Clair and Detroit Rivers call for the construction of spawning reefs to compensate for the habitat lost historically and to help rebuild degraded fish populations. As a result, the remediation plans associated with Area of Concern programs in the St. Many scientists believe that the recovery of lake sturgeon is hindered by a lack of accessible, high-quality habitat, including rocky habitat needed to successfully incubate fish eggs. Sturgeon numbers declined dramatically in the early 1900s and their population remains at roughly 1 percent of historical levels. Similar spawning areas in tributary rivers were made inaccessible as a result of dams or were damaged by development and sedimentation. Clair Rivers when shipping channels were constructed. However, many of the natural limestone reefs and rocky habitat areas were destroyed in the Detroit and St. Lake sturgeon and other Great Lakes fish seek out rocky areas in fast-flowing currents in order to deposit their eggs during spawning season.
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