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October 21, 2014
There is something fishy going on in a vacant house in Detroit’s North End, and University of Michigan (U-M) graduate student Elizabeth “Lizzie” Grobbel takes full responsibility.
That’s because Grobbel, an environmental engineering master’s student and a Dow Sustainability Fellow at U-M, is pursuing a pilot project called “Urban revitalization through sustainable small-scale aquaculture.”
With seed funding from U-M’s Dow Distinguished Awards for Interdisciplinary Sustainability Program, Grobbel is using a vacant house in Detroit to cultivate approximately 400 shrimp from larvae, distribute the mature shrimp within the city, and demonstrate aquaculture as a viable way to address the scarcity of locally grown seafood. She hopes to illuminate a unique and productive use for vacant property in the city.
“Detroit has an estimated 79,000 vacant homes, many of which the city wants to demolish,” says Grobbel, who started working with shrimp in a research project with professor Lut Raskin of the Department of Civil and Environmental Engineering. “I started to question what a good alternative might be for some of the houses, and—given the lack of locally produced protein in the city—figured shrimp aquaculture was worth a try.”
Grobbel initially wanted to pursue her project in an abandoned building but soon realized there were problems with legal access, safety, and security. That’s when Darin McLeskey, a U-M alumnus who owns a house in the city, offered it to Grobbel for the duration of her experiment—at no cost. The price was right and its proximity to the Michigan Urban Farming Initiative was just too perfect and synchronistic to pass up. Co-founded by McLeskey, the initiative is a volunteer farm that grows produce on vacant lots and provides neighbors with fresh produce on a donation basis.
Using the Dow funding to purchase equipment and supplies, and with help from advisers Raskin and professor Jim Diana of the U-M School of Natural Resources and Environment, Grobbel assembled the necessary tank, feeding system, and biofiltration system in the house’s basement, since shrimp prefer the dark. Lucky for her, most of the hardware had already been engineered and constructed for a former project in Raskin’s lab.
The setup includes a large plastic tank with salt water for her mail-order shrimp larvae. The tank is connected to cylindrical biofilters filled with crushed rock, on which bacteria grow and eat the shrimp’s waste. The cleaned water is then recirculated into the tank, eliminating any waste buildup. Once larvae acclimate to the setup, they are transferred to standard fish tanks that are connected to the same biofilters.
Shrimp are typically fed commercial shrimp feed. However, with hands-on support from U-M undergraduate biology student Daniel Bloch, Grobbel is testing the feasibility of using spent beer-brewing grains as a food source. She obtained spent grain from Wolverine State Brewing Co. in Ann Arbor and is test-feeding it to the shrimp.
The shrimp take three to four months to mature. Grobbel is investigating the legal process behind selling and distributing unprocessed, frozen shrimp in Michigan.
“As far as a market for the seafood, my number-one priority is within the city limits,” Grobbel says. “I’ll be giving out samples of the first crop to interested parties and, for subsequent crops, I am looking into possibilities with the Eastern Market, nearby restaurants and other local entities. My goal is for the shrimp to be produced, distributed, and consumed in Detroit.”
However, she also realizes that any long-term contribution will have to develop in her absence. That’s because Grobbel is starting a full-time position next year as director of sustainability for Graham Partners, near Philadelphia. So, while she’s reluctant to leave behind what she started, Grobbel hopes the pilot project will be successful so that someone else will take the idea and run with it. If not, she’s OK with that, too.
“As much as I’d love to see the shrimp aquaculture venture continue, the outcome of the project really is a feasibility/case study of small-scale indoor urban aquaculture,” Grobbel says. “I want to show that you can produce seafood locally, with little overhead, and maybe even make some money in the process. I’m also hoping the results will be of interest to other Rust Belt cities experiencing vacancy and housing decline.”
Grobbel will complete a research report about the experimental results and community impact of her project in December 2014. The report will be published online by U-M’s Graham Sustainability Institute, which administers the Dow Sustainability Fellows Program on behalf of the University. Grobbel also participated in the Graham Institute’s Sustainability Scholars Program while she was an undergraduate at the university.
Information: Elizabeth Grobbel, Graham Sustainability Institute, 625 E. Liberty St., Suite 300, Ann Arbor, Michigan 48104, USA (phone 1-734- 615-8230, fax 1-734-647-6730, email email@example.com, webpage http://detroitshrimp.wordpress.com/contact)
Information: Lisa Pappas, Communications Manager, Graham Sustainability Institute, 625 E. Liberty St., Suite 300, Ann Arbor, Michigan 48104, USA (phone 1-734-615-3325, email firstname.lastname@example.org, webpage http://graham.umich.edu).
Source: Michigan Today. Under the D. Lisa Pappas. October 20, 2014.
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