You begin the investigation of a massive fish kill by collecting water and fish samples. After taking the sample from the field you have to go back to the lab and perform the necropsy of the fish. If you are a good observer the dissection will give you important information about the cause of the death. What would it be your hypothesis?

You need more information to test your hypothesis, so you will use UV-spectrophotometry to analyze the dissolved oxygen in the water sample. Were you right? Would you be able to solve the mystery of the massive fish kill?