Our Kinders were able to watch the alevin's heart beat with the hand held 50x microscope. Even without the microscope you can view the heart beating (look for the small red dot in the far right alevin's throat above the egg sac). Bonus question - why do fish have their heart in their throat and not the chest like us?
Answer - Our heart in in our chest because it needs to be near our lungs to properly oxygenate the blood. In all animals, the cardiovascular (heart/blood) and the pulmonary (lungs) are closely linked. Since lungs don't work underwater, fish use their gills to capture oxygen from the water. Therefore, we would expect to find the salmon heart close to the gills.
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