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Science 

Under the Microscope

In Science students  have been lucky enough to be able to study Daphnia, or water fleas. The body of a Daphnia is usually around 1-5mm. They are crustaceans, commonly found in ponds and lakes, they are widely sold as fish food.  They feed by filtering minute particles such as algae and bacteria from the water in which they live. Students were given warm water, apple juice and a very dilute solution of ethanol. The objective of this experiment was to count the heart rate of the Daphnia in different solutions.
To make sure the risk to the Daphnia was minimal, the microscope lights were only turned on during observation, for a short period of time and as soon as the count had been completed they were returned to the tank.
Our Daphnia will be looked after in the Science Prep Room where they will be fed on yeast. They prefer still bottled water, pond water and rain water. They like the temperature to be around 10-15 C. Can you tell from the labelled diagram the different parts of the Daphnia?