process_catch_norpac: Process NORPAC catches

In pacific-hake/hake-assessment: Stock Assessment for Pacific Hake

Process NORPAC catches

Description

Summarize and plot NORPAC catches for the at-sea hake fishery. Fleet types are assigned to create summaries by fleet and year.

Usage

process_catch_norpac(
  ncatch = get_local(file = "ncatch.Rdat"),
  nyears = 5,
  savedir = hakedata_wd()
)

Arguments

ncatch	A data frame with catch information extracted from the NORPAC database. The default is to read the .Rdat file from the disk using get_local(). Else, users can just pass the R object itself, which would typically be hakedata[["ncatch"]].
nyears	The number of years for plotting.

Value

Figures and csv files are saved to the disk regarding catch rates and depth (fishing and bottom depths).

In the Catches directory, the following csv files are saved:

• depth-us-atsea-bottom.csv

• depth-us-atsea-fishing.csv

• us-cp-catch-by-month.csv

• us-ms-catch-by-month.csv

• us-cp-catch-rate-by-month.csv

• us-ms-catch-rate-by-month.csv

Tribal catches

The column CDQ_CODE contains strings starting with an upper-case followed by and the last two digits of the the CDQ code of the vessel. The code was created in 1995 and is used to track tribal catches in the hake fishery. The following codes exist:

• C51 – Aleutian Pribilof Island Community Development Association

• C52 – Bristol Bay Economic Development Corporation

• C53 – Central Bering Sea Fishermen's Association

• C54 – Coastal Villages Fishing Cooperative

• C55 – Norton Sound Economic Development Corporation

• C56 – Yukon Delta Fisheries Development Association

• R10 – Research Permit - Alaska Fisheries Science Center Catch Estimation

• M01 – Makah Tribe Whiting Association

• R11 – Research Permit - WA Sea Grant bird/longline interaction

• R12 – Research Permit - WA Sea Grant bird/longline interaction

Raw data

Raw data consists of sampled and unsampled hauls with the total weight including bycatch weight. For sampled hauls, EXTRAPOLATED_WEIGHT is the weight of the catch only. For unsampled hauls that have no knowledge of the amount of bycatch included in the haul, OFFICIAL_TOTAL_CATCH must be used along with a estimated bycatch rate to calculate EXTRAPOLATED_WEIGHT. Monthly fleet-specific bycatch rates are estimated from the sampled hauls and multiplied by the OFFICIAL_TOTAL_CATCH to get an estimate of the amount of bycatch that should be subtracted from OFFICIAL_TOTAL_CATCH to get just the weight of Pacific Hake. The raw column names are as follows colnames(ncatch):

• "HAULJOIN"

• "CRUISE"

• "PERMIT": "a unique vessel identifier"

• "VESSEL"

• "VESSEL_TYPE"

• "HAUL_DATE"

• "HAUL"

• "DEPLOYMENT_DATE"

• "RETRIEVAL_DATE"

• "HRS"

• "CDQ_CODE"

• "OFFICIAL_TOTAL_CATCH"

• "HAUL_SAMPLED_BY"

• "LATDD_START"

• "LONDD_START"

• "LATDD_END"

• "LONDD_END"

• "FISHING_DEPTH_FATHOMS"

• "BOTTOM_DEPTH_FATHOMS"

• "CATCHER_BOAT_ADFG": "unique vessel identifier for catcher vessels delivering to motherships"

• "SPECIES"

• "EXTRAPOLATED_WEIGHT"

Definitions

1. OFFICIAL_TOTAL_CATCH is measured in metric tons (mt) and includes both retained and discarded species. Thus, this measurement sums the targeted species, prohibited species, and non-allocated species.

2. EXTRAPOLATED_WEIGHT is measured in kilograms (kg) and includes just the weight of the relevant SPECIES included in that row of data, e.g., if ⁠SPECIES == ⁠r species_norpac“, then EXTRAPOLATED_WEIGHT is the kg of Pacific Hake in that haul.

Assumptions

• sampled hauls have an entry in the SPECIES column, i.e., hake are denoted with 206

• an unsampled haul is represented by one unique record because there no additional lines of catch for the bycatch species given it was not sampled

Author(s)

Kelli F. Johnson

pacific-hake/hake-assessment documentation built on Jan. 14, 2025, 9:12 p.m.