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Electric Fish
Light Lab
Purpose:
In this experiment, we will examine the effects of different magnitudes of
light upon the electric organ discharge (EOD) and the be
havior of Gnathonemus petersii. We will observe the position of
the
fish, the sound of the EOD, and the electric wave displayed on the
oscilloscope.
Materials:
Procedure:
- Turn on the oscilloscope (wait 30 seconds for it to warm up).
- Observe the fish for 5-10 minutes.
- Record behavior of fish on a recording sheet
- Record the behavior of the fish, the amplitude (up or down),
frequency
(up or down), and millivolts (positive/negative) of the electric
organ discharge,
along with any extra comments and observations.
- Turn on a 15 watt light bulb on the side closest to the electrodes
(which
should be attached to wooden dowels with string ; see diagram).
- Leave the light on for two minutes and observe how the fish reacts on
a
recording sheet
- Turn off the light
- Observe the reactions of the fish for five more minutes on a recording
sheet.
- Repeat steps 4 through 6 two more times, but leave the light on for
five
minutes the first time and for ten minutes the second time. (Note: do not
perform each experiment consecutively, do them at different times so as
to allow the fish sufficient time to recuperate.)
- Conduct this experiment again with a 100 watt light bulb.
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