51�Թ�

This flow helps prevent pathogens from invading the reproductive tract by flushing them down and simultaneously selects sperm capable of swimming against the flow toward the egg via a phenomenon known as rheotaxis.

But in high-viscosity media, an increase in shear rate from 0 to 6 per second at 75 millipascal seconds reduced the flagellar curvature by 20%, and the flagellar beating frequency was highest at a shear rate of 3 per second, which is favorable for sperm rheotaxis.

According to the authors, this phenomenon suggests a potential increase in energy production and changes in flagellar beating behavior under these specific conditions to possibly enable rheotaxis and facilitate a transition from circular motion to rolling motion.

When that happens, the anchovies display their contentment by swimming slowly and directly into the flow of water, a behavior known as positive rheotaxis.

When that happens, the anchovies display their contentment by swimming slowly and directly into the flow of water – a behavior known as positive rheotaxis.