hake_recruitment: Pacific Hake annual age-0 recruitments as estimated by the...

In pbs-assess/PACea: An R package of Pacific ecosystem information to help facilitate an ecosystem approach to fisheries management

Pacific Hake annual age-0 recruitments as estimated by the most recent (2024) stock assessment.

Description

The Pacific Hake stock is managed and assessed through an Agreement between Canada and the United States. The recruitment estimates come from the most recent joint stock assessment, and, importantly, are for the coastwide stock from California to British Columbia.

Usage

hake_recruitment

hake_recruitment_2023

hake_recruitment_2024

Format

A tibble also of class 'pacea_recruitment' with columns:

year:

year of the recruitment estimate

low:

low end (2.5th percentile) of the 95% credible interval for recruitment, billions of age-0 fish

median:

median estimate of recruitment, billions of age-0 fish

high:

high end (97.5th percentile) of the 95% credible interval for recruitment, billions of age-0 fish

An object of class pacea_recruitment (inherits from tbl_df, tbl, data.frame) with 58 rows and 4 columns.

An object of class pacea_recruitment (inherits from tbl_df, tbl, data.frame) with 59 rows and 4 columns.

Details

Pacific Hake are a migratory species, generally spawning off southern California in the winter spawning season and migrating to coastal areas between northern California and northern British Columbia during the rest of the year. The stock tends to move farther to the north in the summer during warmer years compared to cool years.

The stock is important to ecosystem dynamics in the Eastern Pacific Ocean due to its relatively large total biomass and potentially large role as both prey and predator. It has highly variable recruitment, as seen by typing 'plot(hake_recruitment)'.

The stock is assessed as a single migratory stock, so it is important to realise (in the context of analyses for Canadian waters) that these estimates are for the full coastwide stock. Results from the biannual coastwide acoustic survey show how the biomass of age-2 and older fish in Canadian waters can vary between years (Figure 2 of most recent assessment).

The 'hake_recruitment' (and 'hake_biomass') estimates are from a Bayesian statistical catch-at-age model, that is fit to the acoustic survey index of biomass, an index of age-1 fish from the survey, annual commercial catch-at-age data, and age-composition data from the survey and commercial fisheries.

Note that recruitments for current and recent years have little data to estimate them, and so can essentially come from the assumed distribution of recruitments. They should therefore likely be excluded from any analyses, as they are not based on data. Exactly how many years are affected can depend upon the timing of the assessment relative to the most recent biannual survey.

Historical estimates of recruitment and biomass will change from stock assessment to stock assessment, and so we use 'hake_recruitment' to represent the results from the most recent assessment (currently 2024), and also save 'hake_recruitment_2024' and 'hake_recruitment_2023' for the results from the 2024 and 2023 assessments (the 2023 results were the first ones included in 'pacea'). This is so that you can always refer to a specific set of assessment results (rather than have your analyses change because you have updated 'pacea' and we have replaced 'hake_recruitment' with results from a new assessment). The same holds for the other hake objects, namely 'hake_biomass', 'hake_recruitment_over_2010', and 'hake_recruitment_over_R0'; i.e. each is also saved with the assessment year appended.

The 2023 assessment is:

Berger, A.M., C.J. Grandin, K.F. Johnson and A.M. Edwards. 2023. Status of the Pacific Hake (whiting) stock in U.S. and Canadian waters in 2023. Prepared by the Joint Technical Committee of the U.S. and Canada Pacific Hake/Whiting Agreement, National Marine Fisheries Service and Fisheries and Oceans Canada. 208 p. https://media.fisheries.noaa.gov/2023-02/2023-hake-assessment-post-srg_web.pdf

The 2024 assessment is:

Grandin, C.J., K.F. Johnson, A.M. Edwards and A.M. Berger. 2024. Status of the Pacific Hake (whiting) stock in U.S. and Canadian waters in 2024. Prepared by the Joint Technical Committee of the U.S. and Canada Pacific Hake/Whiting Agreement, National Marine Fisheries Service and Fisheries and Oceans Canada. 246 p. https://media.fisheries.noaa.gov/2024-02/hake-assessment-2024.pdf

Author(s)

Andrew Edwards

Source

Generated from Andy running (in the hake repository) 'pacea_save()' and then here 'data-raw/groundfish/hake.R'.

Examples

## Not run: 
hake_recruitment
plot(hake_recruitment)

## End(Not run)

pbs-assess/PACea documentation built on April 17, 2025, 11:36 p.m.