Lab 1

Lab 1 – Introduction to Science

Exercise 1: The Scientific Method

Dissolved oxygen is oxygen that is trapped in a fluid, such as water. Since many living organism requires oxygen to survive, it is a necessary component of water systems such as streams, lakes and rivers in order to support aquatic life. The dissolved oxygen is measured in units of parts per million (ppm). Examine the data in Table 4 showing the amount of dissolved oxygen present and the number of fish observed in the body of water the sample was taken from; finally, answer the questions below.


1. Make an observation – Based on the data in Table 4, discuss what patterns you observe in regards to dissolved oxygen content and fish populations in the body of water?

  Answer = From what I can see, no matter how many fish they add or take away the dissolved oxygen still rises by 2 PPM. They observed up to 15 fish and then went back down to 12 and 13 but the dissolved oxygen increased.

2. Do background research – Utilizing at least one scholarly source, describe how the dissolved oxygen content in a body of water can effect fish populations.

Answer = According to my research, most ponds will have more than 10 ppm oxygen dissolved in its’ water. When the dissolved oxygen concentrations are below 3 PPM it will stress most warm water species of fish; however, when concentrations are below 2 PPM it will kill some of the species. There are often time when a fish that has been stressed by dissolved oxygen concentrations in the ranges of 2 or 3 PPM will become vulnerable to disease.

3. Construct a hypothesis – Based on your observation in question 1 and your background research in question 2, develop a hypothesis relating to the amount of dissolved oxygen measured in the water sample and the number of fish observed in the body of water?

  Answer = Aquatic life need oxygen to live, so if there is more oxygen in the water then it could support a larger number...