Depletion

- A total of 23 fish were caught per hour in the first sample.
- The catchability coefficient (q) is estimated to be 0.190 with a 95% confidence interval from 0.058 to 0.322. Thus, it is estimated that 19.0% of the Largemouth Bass (
*Micropterus salmoides*) in the enclosures would be captured with one hour (i.e., one unit) of electrofishing effort. This value is the same as that reported in Maceina*et al.*(1995). - The initial population size (N
_{0}) is estimated to be 108 with a 95% confidence interval from 58 to 159. This value is the same as that reported in Maceina*et al.*(1995). - One would expect to catch 0.190×108.4×1 = 20.6 fish in the first hour of sampling.
- To compute the expected catch for the second sample, one must first reduce the original population size by the number of fish removed with the first sample (i.e., N
_{0}-N_{0}×q×1) and then multiply that times q×1. Thus, the expected catch for the second sample is (108.4-20.6)×0.190×1 = 16.7 fish.

```
d <- data.frame(ct=c(23,12,13,14,9,7),
ft=rep(1,6)) %>%
mutate(CPE=ct/ft)
depl1 <- depletion(d$ct,d$ft,method="Leslie")
summary(depl1)
confint(depl1)
```