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Testing the effect of water temperature on the respiration rate of goldfish

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Background Information: 1. Goldfish are exothermic, meaning their body temperature depends on the water surrounding them. As the water cools/heats the first things to be affected are their digestion, respiration, and immune response. When a gold fish is exposed to extreme cold water, their body starts to shut down their non-vital organs first. They slow down their breathing because they don?t as much oxygen to bring to their working organs. As the water gets heated up, goldfish tend to become more active, and this is the time breeding is most correlated with. Hypothesis: 1. If you change the water temperature, then the amount of breaths the fish will take will adjust, because the fish won?t need as much oxygen to perform it?s bodily functions. ...read more.


3. Record the amount of times the fish opens it’s mouth in a period of 60 seconds. 4. Insert thermometer into the beaker, slowly add ice to the beaker until it reaches 3® C, count the number of times the fish opens it’s mouth within a 60 second time period. Record data. 5. Place the beaker on the hot plate and carefully raise the temperature to 6® C and count the breaths the fish takes, record the data. 6. Repeat step 5, raising the degree by 3® each time until you reach 30 ® C. After every 3® increase, count number of breaths for 60 seconds. ...read more.


As you heat the water back up the number of breaths taken increase/ stay the same as the initial because it has all of its organs working. Conclusion: 1. If you change the water temperature, then the amount of breaths the fish will take will adjust. My results do support my hypothesis. As all experiments have, there were a few errors. The number of breaths taken could fluctuate depending on how accurate the reading of the temperature was, and due to human error of not counting fast enough. If we were to do the experiment over again, I believe we should video tape the fish, that way you can slow down the video and get an accurate reading of how many times it opens its mouth. You could as make sure all the temperatures of the water were the exact same. ...read more.

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