It has been shown that adult females cannot locate the host at a distance via rheotaxis or chemotaxis.
2.
In fish that exhibit rheotaxis, it can easily be demonstrated by creating an artificial current within a tank using pumps.
3.
Some resemble small fish themselves, with eye spots, a'tail'and horizontal stripes, and may even move in a similar fashion, as if facing the current ( rheotaxis ).
4.
However, careful experimental examinations of all these possibilities with proper controls demonstrated that the measured responses to temperature are true thermotactic responses and that they are not a reflection of any other temperature-sensitive process, including rheotaxis and chemotaxis.
5.
This belief was taken apart when it became clear that only few of the ejaculated spermatozoa in humans, only ~ 1 of every million spermatozoa succeed in entering the oviducts ( Fallopian tubes ) and when more recent studies showed that mammalian spermatozoa employ at least three different mechanisms, each of which can potentially serve as a guidance mechanism : chemotaxis, thermotaxis and rheotaxis.
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