Despite zebra mussels being wildly successful at reproducing and spreading in Minnesota lakes, they are incredibly difficult to maintain and propagate in a lab setting. This presents a challenge for researchers because many studies require multiple generations of zebra mussels to assess the long term impacts of control options, particularly genetic methods. MAISRC researchers are learning how to sustain zebra mussels in a lab setting in order to learn more about them.
In phase II of this project, MAISRC researchers advanced efforts to rear invasive zebra mussels in a controlled setting by focusing on improved nutrition, better husbandry practices, reducing competitors, and finding collection sites closer to the Twin Cities. Weekly tank cleanings and feeding a specific algae species, Chlamydomonas reinhardtii, led to healthier mussels with increased weight and successful spawning. Refining water purification and washing methods reduced competitors and fouling, enabling larvae to develop to a critical stage, known as D-stage veligers, for the first time. Additionally, researchers identified Cedar Lake as a new collection site with favorable conditions, which will enhance efficiency and support propagation efforts in 2025.