DETROIT (AP) — Crews have dumped 25,000 tons of limestone blocks into the Detroit River as part of a mission to restore lake sturgeon.
The ancient fish can reach 7 feet long, weigh more than 300 pounds and live longer than a century. They once were plentiful in the Great Lakes but fell victim to overfishing and habitat destruction. They’re now threatened or endangered in most of the region.READ MORE: Michigan Health Officials Urge Primary Care Doctors To Help Vaccinate
The limestone deposit added 4 acres of spawning reef areas for sturgeon near Detroit’s Belle Isle.
The federal government has provided about $10 million for a series of reef construction projects in the St. Clair and Detroit rivers.READ MORE: Krispy Kreme Is Giving Out Free Donuts To Graduating Seniors
Experts say the reefs are attracting egg-laying females. But because sturgeon mature slowly, it could take decades to determine whether the efforts are boosting the population.
MORE NEWS: AG Nessel Issues Consumer Alert On Over-The-Counter Hearing Aids
Copyright 2017 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.