Discovered via a pal comes this interesting wee video showing how trout move side to side with the swirling water behind objects in a river. Looks like there’s a reference to an academic paper too, so I’ll have a dig and see what I find. In the meantime, check it out.
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The Karman gait – what a great name. It almost looks like they are using the current to push them side to side rather than making a deliberate stroke – especially compared to the frenetic tail beats of a fish in normal stream flow. Some interesting stuff in the paper about holding positions and size of the object in front of them too.
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It’s a cool name, and a cool video, I agree. Been snowed under a bit so I haven’t gone over the paper properly, but will do.
You’re right, they look as if they’re just rolling side to side with the vortices that are being shed from the object. Would be really interesting to have some die inserted in the flow as well as the fish, to track exactly where the vortices are located.
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