Hypothesis: If you increase the amount of dissolved
oxygen in the water, then more fish will be observed because fish need oxygen for
cellular respiration.
Independent Variable: Amount of
dissolved oxygen
Dependent Variable: Number of fish
observed
Control variables: same temperature, body of
water, amount of light, same amount of fish food
Control
experiment: Water from the body of water without altering the
oxygen.
Experiment: Create a series of aquariums with
different levels of dissolved oxygen (0ppm, 2ppm, 4ppm, 6ppm, 8ppm, 10ppm) including one
take designed to have the exact same conditions as the pond the minnows come from.
Place 100 minnows in each tank. Take data daily on number of fish in each tank.
Proceed for a week. Remove dead fish from the
tank.
Data analysis: Dissolved oxygen is
necessary for fish to perform cellular respiration. In this experiment it was
determined that these fish thrive in water sources that are between 6-14 ppm with the
most fish found in 12 ppm at 15 fish. The least amount of fish were found in water
sources with 0 ppm which is otherwise known as anoxic
conditions.
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