Yes. Grab a video and use ffmpeg or opencv or similar software to count the beats. Some apps can slow down the video. So it should be possible to count with a little arithmetic.
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Ohhh great @jtd sir 
so yes we can perform this experiment and can check the effect of different lights on moina . 
Let’s design it…
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To prove the observation timming is very essential because if they were actually paralyzed then that effect must have been very quick almost instantaneously so we need to keep in mind if that’s not the case then it must not be paralysis.
@jtd Sir are you talking about some kind of recognition software since you mentioned Opencv or something different? And Moina are very small so are you talking about taking a video with microscope or something else? Please clarify.
Yes, we can measure the heartbeat of moinas and we’ll try that for sure.
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Yes. Opencv is a image / video feature extraction software.
Yes. We have to use a microscope or webcam scope.
ffmpeg is a video processing software with a built in player. one can slow down playback rate.
VLC is a video player. One can slow down playback rate.
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We are yet to find why do Moinas get attracted to light.
Moinas are positively phototactic i.e. they get attracted to light (when we flash phone’s LED light).
The eyes of M. eugeniae appeared connected with muscle fibres, this should indicate that the ocular (eye) organs can be moved in some directions to detect preys or mates and I think that they find the light as a navigational guide. Many insects find their way by keeping a natural light source like the sun.
Moinas have a compound eye which consists of ommatidia - optical units which further consists of photoreceptors and sensory cells. These sensory cells help the Moinas to move towards the light source.
Reference : Microanatomy of Moina eugeniae (Branchiopoda, Cladocera), Journal of Life Sciences 6 (2012).
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