DEARBORN, Mich. (AP) — In the shadow of the powerhouse that Henry Ford built alongside the Rouge River to light his estate, a pair of blue herons linger near the water's edge before taking flight.
For Jim Murray, who has spent decades working to rally government, businesses and volunteers to rejuvenate what once was one of the nation's dirtiest rivers, the birds represent only one example of how far the cleanup has come.
And:
Lake Whitefish Returning to the Detroit River to Spawn; Federal Scientists Document First Reproducing Population of Whitefish in the River Since 1916
Lake whitefish, currently the number one commercial fish in the Great Lakes and a key indicator of ecosystem health, are once again reproducing in the Detroit River according to scientists with the U.S. Geological Survey (USGS) and the U.S. Fish and Wildlife Service (USFWS).
Scientists from the federal agencies discovered spawning lake whitefish and fertilized whitefish eggs in the Detroit River last fall, the first documented spawning of the fish in the river since 1916. The discovery provides further evidence of progress in the ecological recovery of the Detroit River, home to North America’s only International Wildlife Refuge and part of the International Heritage River System.
The Detroit River recently received international acclaim at the Whitehouse Conference on Cooperative Conservation for its progress towards ecological recovery and for the public and private partnerships that have worked to revitalize the storied river. The river is now a major catalyst in the economic redevelopment of the Detroit River waterfront and the revival of a glorious “front porch” for the region.
“The return of lake whitefish to the Detroit River is partially the result of 40 years of pollution prevention and control activities in the Detroit/Windsor metropolitan areas”, said Dr. Leon Carl, Center Director, USGS Great Lakes Science Center. “Scientists are continuing studies of this unique river ecosystem to learn more about the habitat needs of lake whitefish and other native fish that may potentially lead to the re-establishment of this heritage fishery.”
“This whitefish recovery is helping transform the river into an internationally recognized wildlife refuge that is providing an exceptional ecotourism experience to residents of Southeast Michigan and Southwest Ontario”, said Dr. John Hartig, Refuge Manager, Detroit International Wildlife Refuge.
The Detroit River was well known for its whitefish fishery in the 1800s and early 1900s, but habitat loss and degradation, pollution, and other factors contributed to the loss of this important fishery. The river has a history of environmental problems such as oil pollution in the 1940s and 50s; phosphorus pollution in the 1960s; “mercury crisis” of 1970 and organochlorine contamination since the 1970s. The river began its rebound to better health in early 1970s with the U.S. and Canada Great Lakes Water Quality Agreement and passage of the U.S. Clean Water Act in 1972. Other federal, state and local initiatives have since helped to reduce the volume of pollutants entering the river. Compared to 1972 levels, discharges of oil have been reduced by 98 percent and phosphorus discharges reduced by 95 percent. Scientists have also measured a 70 percent decline in mercury contamination in fish and an 83 percent decline in PCB levels in herring gulls from Fighting Island. The Detroit River now boasts reproducing populations of peregrine falcons, lake sturgeon, and bald eagles, and is gaining a national reputation as a world-class walleye fishery.
Scientists will continue to assess a number of sites in the Detroit River and in the Huron-Erie Corridor (which also includes the St. Clair River, Lake St. Clair, and western Lake Erie) to determine where whitefish are spawning, what their habitat requirements are, and other information on growth and reproduction. USGS scientists are currently conducting additional whitefish habitat assessment in the Detroit River which began in March, 2006, and have collected many whitefish larvae. The whitefish eggs collected in 2005 were brought back to the USGS Great Lakes Science Center in Ann Arbor, subsequently hatched, and are now being raised in the lab. Results from this research will help direct fisheries managers in future efforts to restore native fish populations and habitat in the river.
Posted by Dave at May 20, 2006 12:01 PM