(PhysOrg.com) -- Overfishing and destruction of its habitat have driven the Arctic grayling from its native Upper Michigan waters. But Michigan Technological University biologists Nancy Auer and Casey Huckins are looking into the possibility of bringing them back.
The fish, a member of the Salmonidae family of fish, like trout, disappeared long ago from Michigans rivers and lakes. Its range had stretched from the Au Sable River below the Mackinac Straits to the Otter River in the Keweenaw.
Auer, who is noted for her work with lake sturgeon, and Huckins, whose research focuses on coaster brook trout, are studying the viability of reintroducing Arctic grayling in the Big Manistee River watershed, where, Auer says, In days of old, they used to be very abundant.
Auer and Huckins, both associate professors in biological sciences at Michigan Tech, have a two-year grant from the Little River Band of Ottawa Indians to study the potential for reintroducing the native fish. Working with them are two graduate students, Brian Danhoff (whom Huckins advises for an MS) and Cameron Goble whose advisor is Auer. At the moment they are electro-fishing on the Manistee to record the resident fish, identifying potential competitors and predators. The faculty-student team is collaborating with two other Michigan Tech PhD candidates, Stephanie Ogren and Marty Holtgren, who work for the tribe.
The Manistee flows southwest for about 230 twisty miles, from near Alba to Manistee, where it empties into Lake Michigan. The watershed has more than 80 species of fish, including 13 non-natives, but no longer any grayling.
The Michigan Tech team is focusing on a 11-mile section of the Big Manistee, between two hydroelectric dams, the Tippy and the Hodenpyl. What Huckins calls the main stem has six tributaries, which Auer calls cold water inputsnecessary because grayling require clean, cold water.
Besides other species, the students are looking at river discharge, the substrate, water temperature and the availability of food in the driftall to identify whether the characteristics of the aquatic environment could support grayling. We want to have a really good idea about the suitability of the habitat before we move, Auer explains. Overall, Huckins describes the objects of inquiry as the biotic (living things) and the abiotic (chemistry and physical makeup)both aspects of the river system and its potential to support grayling.
Meanwhile, he and Auer are searching the scientific literature to determine ideal historic conditions and the best genetic strain of grayling to use, should reintroduction prove promising.
Its exciting to think that it might be possible, Auer says. She is enamored of this native species. Grayling are what we used to have, and theyre a remarkably pretty fish.
There are two types of Arctic grayling, distinctive by an outsized dorsal fin: those that live in rivers and those that live in lakes. Auer and Huckins are looking at the river type for the Manistee. In North America, abundant populations of Arctic grayling thrive in Canada and Alaska. In the Lower Forty-eight, Montana has the sole self-sustaining grayling population, in the Big Hole River.
Why the big fin? Its always dangerous for us to say why a species has a distinctive feature, Huckins says. We dont know why that feature evolved, why its so large and colorful.
Huckins, who grew up in Montana, recalls seeing spawning grayling in a remote creek. To this day, I remember those flapping dorsal fins waving back and forth, he says. It was almost magical.
Should the inquiry lead to stocking, Auer and Huckins suggest that the people in charge be fussy about identifying the right strain of fish to stock to have the best chance for success. The State of Michigan tried restocking both river and lake grayling in the late 1980s and early 1990s, but the fish didnt establish due to a number of factors, including hooking mortality, disease, predation and competition.
Auer notes that, in general, fish are highly adaptable, and nonnatives, like salmon, black bass, and brown trout, have been plunked all over the place for fishermen. Weve played musical chairs with fish everywhere. She adds. Our lake trout are in Wyoming.
Auer and Huckins attended a symposium and workshop on Arctic grayling in Grand Prairie, Alberta, Canada, in June. We were surrounded by people dedicated to the study and preservation of the species, Huckins says. We got great support. They said the potential is good. The logic is there.
Auer adds, The mantra from the professionals who work with grayling is persistence. You have to keep at it. If you want fish to come back, stick to a stream and work for several years. Dont give up.
Whether working with lake sturgeon, coaster brook trout or grayling, Auer says, The goal is to get people aware of how beautiful these fish are, and how wonderful these ecosystems are. These big rivers are our lifeblood.
The land around the target area on the Big Manistee is national foresta protected place of abundant wildlife and beauty. Auer told a member of the Little River Band, I just love coming down here. I love this forest. The native replied, Now you can see why our ancestors chose to live here.
Huckins calls it a gorgeous watershed with little land use beyond the natural which is good, Huckins adds, because grayling are a somewhat fragile species. They are low on tenacity. They are more sensitive. They dont tolerate land use well, and it appears they dont tolerate strong competition, the biologist explains.
He says the Manistee work is more than repopulating a fish. Its an important species to the tribe, he says, with spiritual and cultural connections.
Thats because in the Native American world, theyre not grayling, theyre fish people.
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More information: For more information on nonnative lake trout that were introduced into Wyoming in the 1890s, see: J.R. Ruzycki, D.A. Beauchamp, And D. L. Yule, Effects Of Introduced Lake Trout On Native Cutthroat Trout In Yellowstone Lake Ecological Applications, 13(1), 2003, pp. 2337.