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In a laboratory experiment, the orientation of brine shrimp—often called “sea monkeys”—was linked to whether energy moved toward larger or smaller scales in a shallow, two-dimensional turbulent flow. A later test using rods reported similar control. The result suggests that geometry can influence energy transfer in this particular setup; it does not show that small obstacles can reverse turbulence in every natural flow.
What the experiment found
Lei Fang and Xinyu Si studied brine shrimp in a shallow layer of salt water driven into a two-dimensional flow. In their reported observations, a solo shrimp oriented at less than 45 degrees to the direction of maximum stretching was associated with energy moving from smaller scales to larger scales. At an orientation above 45 degrees relative to that same reference direction, energy moved from the larger-scale flow toward smaller perturbations.
The angle is specific to how the experiment defined the direction of maximum stretching. It is not a universal threshold for turbulence or for objects placed in a flow. Quanta Magazine reported the shrimp findings in 2026, describing the initial work as a 2024 result and the rod follow-up as occurring in 2025: Quanta Magazine’s account of the experiment.
How the salt-water setup worked
Si spread a thin film of salt water over glass and placed magnets beneath it. Electric current passing through the conductive fluid interacted with the magnets, driving water in opposite directions along the two sides of a channel. This created a central region with a velocity gradient. The researchers introduced shrimp into that region and analyzed how their moving bodies disturbed the flow.
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To study individual orientations, Si filmed shrimp repeatedly and waited for one to cross the test area at a useful angle. The researchers later used centimeter-long rods, which were easier to measure, and reported that changing their orientation also allowed them to control transfer toward higher or lower scales. Numerical simulations by Filippo De Lillo and Guido Boffetta reproduced the effect, according to Quanta’s report.
Why orientation can affect energy transfer
The proposed explanation involves the alignment of two tensors: one associated with large-scale shear and energy flux, and another associated with flux shaped by the swimmer’s small-scale motion. As a shrimp or rod changes orientation, the alignment changes, influencing the direction of energy transfer.
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Lei Fang, an engineer at the University of Pittsburgh, summarized the idea to Quanta: “The geometry matters.” That describes a proposed mechanism for this setup, not a claim that the organisms independently create or control every feature of the flow.
How this fits with established cascade ideas
In the familiar picture of three-dimensional turbulence, energy generally moves from large eddies to smaller ones, where viscosity eventually dissipates it as heat. For idealized two-dimensional turbulence, work associated with Robert Kraichnan and George Batchelor describes an inverse cascade in which energy can move from small eddies toward larger coherent structures.
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The shrimp and rod results add a possibility within that broader framework: in a two-dimensional flow, the direction of energy transfer may be influenced locally by the geometry of an intervention. They do not overturn cascade theory or establish that energy can flow in any direction under all conditions. Physicist Gregory Falkovich of the Weizmann Institute of Science called the work “a beautiful and skillful experimental work,” as quoted by Quanta.
A separate study examined rotating-tank turbulence
A March 2, 2026 paper by Francesca De Serio in Physical Review Fluids investigated local energy-cascade organization in geophysical flows. Its abstract describes a 13-meter-diameter rotating tank, a steady horizontal turbulent momentum jet injected at mid-depth, and high-resolution planar particle-image velocimetry. The authors report that stress–strain alignment and local Rossby number governed the local direction and persistence of energy transfer; stronger rotation expanded coherent inverse-cascade patches and increased their persistence as they moved with the flow. See the American Physical Society abstract.
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This rotating-tank work and the shrimp/rod experiments are related by their interest in local control of energy pathways, but they use different flows and interventions. The former examines rotation and an injected jet in a large tank; the latter examines object orientation in a shallow, weakly turbulent layer.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the result does—and does not—say about nature
Friction in the shallow layer made turbulence difficult to initiate. The experiment therefore studied a weakly turbulent, two-dimensional system, unlike the strongly turbulent three-dimensional flows common in nature. Whether orientation-based control extends to those conditions remains an open question. Si and Fang are investigating extensions, including tabletop tornadoes, but the shrimp experiment itself does not demonstrate control of large natural flows.
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Quanta describes possible future relevance to pollution control and drug design, where influencing mixing or transport barriers could matter. Fang offered a theoretical estimate that disrupting a transport barrier might require less than 1% of the energy needed to maintain it. That is a theoretical estimate reported by Quanta, not a measured energy saving or a demonstrated industrial process. De Serio’s rotating-tank study likewise suggests possible environmental and industrial strategies rather than establishing deployed applications.
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