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The purpose of this lab was to observe the opening of the fishs mouth and its operculum (flap covering the gills) to determine the breathing rate of fish at different temperatures.

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Introduction

Fish gills remove oxygen from water as human lungs extract oxygen from air. The oxygen content in air is about 20 times greater compared to water. Therefore aquatic animals such as fish, spend about 20 times more energy breathing than air breathers such as humans. This project will determine how temperature affects breathing rates of fish. The purpose of this lab was to observe the opening of the fish's mouth and its operculum (flap covering the gills) to determine the breathing rate of fish at different temperatures. Hopefully, information obtained from this lab can be used by people to keep their pet fish healthy and happy. "How does environmental temperature changes affect cellular respiration rate in a goldfish?" Hypothesis: The requirement of oxygen for a fish changes with water temperature. As the temperature rises, the metabolism of the fish increases. ...read more.

Middle

Use a timer to do this. 6. Repeat step 5 three times. 7. Average the three trials to determine the average breathing rate for one minute. Testing how temperature affects breathing rate... 1. Place thermometer inside the container. 2. Set the container in a half filled bowl of water. 3. Lower the temperature of the water in the container by five degree intervals by adding pieces of ice to the water in the bowl. 4. At each uniform temperature, make sure to wait 5 minutes to allow the fish to get used to the new temperature. 5. Count the number of times the fish opens and closes its mouth in a minute. Do this three times for each temperature. 6. Continue lowering the temperature by 5 degree intervals but make sure you don't go below 5 degrees. ...read more.

Conclusion

The results indicate the hypothesis should be accepted. The increase in breathing rate most likely relates to the increase in metabolism when the temperature rises. This is why other cold blooded animals such as lizards are still when it's cold but are very active when it' warm. Also gases tend to dissolve into liquids easily when its cold compared to when it's warm. So the fish must breath more when it' warm to obtain enough oxygen. This experiment could have been used to test breathing rates of different kind and size of fish. The temperature would have to be controlled in that case. Although counting keeping up with the opening and closing of the fish's mouth was difficult, the experiment went smoothly overall. 1 Vancleave, Janice. Janice Vancleave's a+ Projects in Biology. New York: Wiley, 1993. 2 www.mszibrat.com/Alt.Lab10.pdf ?? ?? ?? ?? ...read more.

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