Freshwater jellyfish

March 24 2017

People all across the US, from Kansas to Florida, Washington to Maine, are in for a real surprise this summer. Visiting local lakes is a great way to beat the heat, and to many's shock, also a great way to find jellyfish! Freshwater jellyfish live all over the US, and can be found in everything from ponds to quarries to large reservoirs. As a scientist specializing in jellyfish, I've been trying to study these strange animals for years. However, without a citizen science team and ROV, it's hard to locate and collect them. This expedition will explore lakes in search of freshwater jellyfish, with the aim of better understanding the biology and ecology of these mysterious and beautiful animals.

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March 24 2017

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Expedition Background

The last thing I expected when I visited Thoreau’s famous Walden Pond was to find jellyfish. But small, nickel-sized jellies were teaming in the cold October water, underneath a canopy of red and gold leaves. As a scientist who studies jellyfish, I desperately wanted to learn more about these odd freshwater jellies, so I returned to the pond with my high-tech equipment: a net, collecting jars, and a bright green pool noodle. I floated around, freezing, on the noodle for nearly an hour before I found the jellies. These small, clear jellies weren’t spread evenly over the pond like I’d thought; instead, they were all clumped in a single bay at the surface, not far from the stone remnants of Thoreau’s cabin. Though I collected a number of jellies, they did not breed successfully in captivity, and within a few weeks all the jellies in Walden Pond were gone. My chance to study the freshwater jellies that year had passed.


Though freshwater jellies seem elusive, they are all over the United States, often appearing and disappearing with little notice. Even though they’ve been reported in 44 of the 48 contiguous united states, we know very little about these animals. For example, all the animals I observed were grouped together in a small area of the lake. Do they passively concentrate in certain parts of a lake, or like the famous golden lagoon jellies on Palau, do they actively migrate throughout the day? If we can locate freshwater jellies effectively, and in multiple different lakes, we’ll have a much better chance of answering these questions. However, floating on a pool noodle in cold water simply is not an effective strategy for finding and studying freshwater jellies.

I propose to study freshwater jellyfish, in collaboration with citizen scientists, using a Trident ROV. We will use the ROV to locate jellies in multiple lakes, and examine their distribution and daily movement patterns. Once we find jellies, I will collect them for further study in the lab. I will conduct this work in conjunction with an outreach campaign with the local community. I will alert citizens to the general presence of freshwater jellyfish through op-eds in local newspapers, flyers, and public talks. Citizens will report sightings to me via email or through our expedition webpage, and I will invite them to join me in the field as we locate freshwater jellies with the Trident ROV. With the aid of a Trident ROV and citizen science, we will be able to study these strange and beautiful animals, and hopefully catalyze interest in freshwater jellies and local freshwater ecology throughout the region.

(photos: Number 1: The old "old way" of collecting jellies in a pond with a pool noodle Number 2: A freshwater jellyfish, from Wikimedia commons)

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This is so cool Rebecca. I'm excited to participate in the citizen science aspect. Maybe another post about how to know which lakes and freshwater ecosystems would be likely candidates?

I am so excited about this project!

We'd be happy to help look in the Great Lakes!

Great project! Will keep an eye on it