Maceina et al. (1995) examined the population of harvestable Largemouth Bass (Micropterus salmoides) in Connor Cove of Lake Guntersville, Alabama (a 28,000 ha impoundment of the Tennessee River) in March, 1992. Their objective was to estimate the abundance of harvestable bass through the depletion of catches due to electrofishing. In their study, they electrofished for 15 minutes at each of four depth strata. The total number of bass captured and removed from the population in the full hour of electrofishing at the four depths was recorded. Thus, a total of one hour of electrofishing constituted one unit of effort. Six one-hour periods were used to deplete the population of bass in one Connor Cove. The number of bass caught in each successive sampling period was 23, 12, 13, 14, 9, and 7. Use these data to answer the following questions.

  1. Enter the catch and effort data into separate R vectors. Calculate a vector from these vectors that represents the CPE in each sampling period. Carefully interpret the meaning of the first value in the CPE vector.
  2. What is the best estimate and 95% confidence interval for the catchability coefficient? Very carefully interpret what this estimate means relative to Connor Cove Largemouth Bass. How does your estimate compare to the estimate published in Maceina et al. (1995)?
  3. What is the best estimate and 95% confidence interval for the population size? How does your estimate compare to the estimate published in Maceina et al. (1995)?
  4. Estimate the expected number of bass that would be caught in the first sampling period given your best estimates of \(q\) and \(N_{0}\), and the amount of effort used in each sample period.
  5. Estimate the expected number of bass that would be caught in the second sampling period, again given your best estimates of \(q\) and \(N_{0}\), and the amount of effort used in each sample period.?

from Derek H. Ogle , created 21-Jan-16, updated 28-Jan-16, Comments/Suggestions.