Catch and effort data for Deepwater Caridean Shrimp.

Description

Catch and effort data for Deepwater Caridean Shrimp (Heterocarpus laevigatus) from 15 days in 1984 from near Alamagan Islan in the Marian Archipelago (near Guam).

Format

A data frame with 15 observations on the following 4 variables.

• day: Day of the catch. Day 9 is 9-Jan-1984.

• standard: Catch (kg) of of Shrimp in the standard traps.

• pyramid: Catch (kg) of of Shrimp in the pyramid traps.

• effort: Total effort (trap-nights) for the standard traps.

Details

Catch (kg) and effort (trap-nights) of Deepwater Caridean Shrimp (Heterocarpus laevigatus) from 15 days in 1984 from near Alamagan Islan in the Marian Archipelago (near Guam). The data start on 9-Jan-1984. Catches were recorded separately for standard traps and in pyramid traps.

The original authors estiamted populations size using the Leslie method with the cumulative catch from the combined catch in the standard and pyramid traps, but with a CPE computed from just the catch in standard traps.

Topic(s)

• Population size
• Abundance
• Depletion methods
• Leslie method
• DeLury method
• Catchability

Source

From Table 1 of Ralson, S. 1986. An intensive fishing experiment for the Caridean Shrimp, Heterocarpus laevigatus, at Alamagn Island in the Mariana Archipelago. Fishery Bulletin 84:927-934. [Was (is?) from http://fishbull.noaa.gov/844/ralston.pdf.]

Examples

data(ShrimpGuam)
str(ShrimpGuam)
head(ShrimpGuam)

## Computations by the original authors
# CPE for just the standard traps
ShrimpGuam$CPE <- ShrimpGuam$standard/ShrimpGuam$effort
# Total catch in both traps
ShrimpGuam$total <- ShrimpGuam$standard+ShrimpGuam$pyramid
# Cumulative catch in both traps (with the Ricker modification)
ShrimpGuam$cumCatch <- cumsum(ShrimpGuam$total)-ShrimpGuam$total/2