Inch Lake is a 12.5 ha inland lake in northern Wisconsin that has been managed as catch-and-release for all species since 2006. Researchers at Northland College have monitored fish populations in Inch Lake since 2007. The total lengths (inches) and weights (g) for subsamples of several species of fish collected from Inch Lake in May of 2007 and 2008 are recorded in InchLake2.csv (view, download, meta). Use these data to answer the following questions.

Complete this Data Manipulation exercise to create the required data.frames used in the following questions.

  1. Describe the following from plots constructed with the Bluegill only data.frame.
    1. The distribution of lengths.
    2. The distribution of weights.
    3. The distribution of lengths separately for each year (using only one command to make separate plots).
    4. The relationship between weight and length.
    5. The relationship between the natural logs of weight and length.
    6. The relationship between the natural logs of weight and length separately for each year (using only one plot).
    7. The difference in mean lengths between the two years (plot should include confidence intervals).
  2. Repeat the previous question but using Largemouth Bass.
  3. Describe the species distribution of (only) non-game species.

Save the script from this exercise as these data will be used in this weight-length relationship and this condition exercise.


from Derek H. Ogle , created 01-Oct-15, updated 08-Nov-15, Comments/Suggestions.