fishmethods (version 1.4-0)

catchpertrip: Catch-Per-Trip Analysis for Marine Recreational Fisheries Statistics Survey Data

Description

Catch-per-trip analysis for Marine Recreational Fisheries Statistics Survey data following the Chapter 4 of Recreational Fisheries Data User's Manual.

Usage

catchpertrip(intdir = NULL, estdir = NULL, species = NULL,
 state = NULL, mode = NULL, wave = NULL, styr = NULL,
 endyr = NULL)

Arguments

intdir

the path and main directory (in quotes) under which raw intercept sub-directories are stored.

estdir

the path and main directory (in quotes) under which catch/effort sub-directories are stored.

species

10-digit NODC species code. A complete list of species codes is provided at the MRFSS website.

state

state(s) code of data to include. A complete list of state codes is provided at the MRFSS website. Atlantic and Gulf States: 23= ME, 33= NH, 25= MA, 44= RI, 9= CT, 36= NY, 34= NJ, 10= DE, 24= MD, 51= VA, 37= NC, 45= SC, 13= GA, 12= FL (1

wave

bimothly wave(s) of data to include. Bimothly Waves: 1= Jan-Feb, 2= Mar-Apr, 3= May-Jun, 4=J ul-Aug, 5= Sept-Oct, and 6= Nov-Dec. Any combination of waves can be included in c().

mode

the fishing mode(s) of data to include. Valid codes will depend on year. Years 1982-2004: 3= Shore, 6= Party & Charter Boats, 7= Private & Rental Boats. Years 2005-present: 3= Shore, 4= Party Boat, 5= Charter Boat, and 7= Private & Rental Boats.

styr

the starting year of data to include.

endyr

the ending year of data to include.

Value

• Results
  Dataframe containing catch level (CATCH), estimated number of trips (TRIPS), intercept frequency (CF) and proportion of successful trips(PROP.TRIP)

Details

Raw intercept data and catch/effort estimates must be extracted using function extractMRFSS before catch-per-trip analysis can be conducted. When performing catch-per-trip analyses within a state/mode/wave stratum, reweighting of data is not necessary since intercept sampling is random within each stratum and an assumption can be made that the true effort distributions are represented. However, if catch-per-trip analyses are performed among state/mode/wave strata, data must be reweighted prior to pooling among strata. This function properly reweights and combines data for catch-per-trip analyses.

References

Marine Recreational Fisheries Statistics Survey - Recreational Fisheries Data User's Manual http://www.st.nmfs.noaa.gov/st1/recreational/SurveyMaterials.html

See Also

extractMRFSS

Examples

## Example of a typical specification - for Mid-Atlantic
## black sea bass wave 4, all modes in 1992. Figure 11 of Chapter 4 
## in User Manual
catchpertrip(intdir="C:/Temp",estdir="C:/Temp",species=8835020301,
state=c(10,24,34,36,51),mode=c(3,6,7),wave=c(4), styr=1992,endyr=1993)