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the data table. 2.
Use the bulb baster to transfer water and fish embryos from the aquarium
to a beaker. Allow the embryos to settle to the bottom.
3. Use a wax pencil to write your name and class period on the
edge of the lid of your petri dish. Use the dropper to half fill the bottom
of your petri dish with aquarium water, and then to transfer several embryos
from the beaker to your petri dish. Place the lid on your petri dish.
4. Your teacher will tell you the approximate time that fertilization
occurred. Record the age of the embryos in your data table as hpf (hours
past fertilization).
5. Observe the embryos under the microscope. In your data table,
diagram what you observe.
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6.
Post your data.
7. Continue to observe your embryos daily for one week. Note when
new organs appear and when movement is first seen. If you want to continue
observing developmental changes, ask your teacher for instructions.
CAUTION: Wash your hands with soap and water immediately after
each observation.
8. Clean all equipment as instructed by your teacher,
and return everything to its proper place. Dispose of the water and embryos
properly. Wash your hands thoroughly.
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