29 HMS Spawning Stock Biomass and Recruitment
Description Biomass and recruitment estimates for many HMS stocks that occupy the California Current are available from stock assessments conducted by collaborators under the International Scientific Committee for Tuna and Tuna-like Species in the North Pacific Ocean (ISC) or the Inter-American Tropical Tuna Commission (IATTC).
2024-01 Update The only assessment updates since the 2023-24 ecosystem status report are for Pacific bluefin tuna, skipjack tuna, and bigeye tuna. The 2024 bigeye tuna assessment underwent several changes since the last benchmark assessment (Xu 2024). The assessment uses a risk analysis approach, encompassing three levels of hypotheses structured hierarchically to address the main uncertainties in the assessment. The time-series shown here are multi-model estimates. The 2024 skipjack tuna assessment is a significant improvement over the 2022 interim assessment (Bi 2024). It reflects major advancements in the assessment methodologies and incorporates new data sets, including tagging data. The Pacific bluefin tuna assessment also included some improvements to the model used in the last (2022) benchmark assessment (ISC 2024). One of the major changes made was to shorten the assessment time period to start in 1983 instead of 1952. This adjustment was implemented because more reliable data were available after 1983. For all species, we emphasize that the status and trends symbols shown in our status and trend figures reflect short-term patterns relative to time series averages (with a period of reference of 1991-2020), and do not necessarily reflect reference points based on, e.g., unfished stock biomass.
Indicators
- Species:
- Albacore:Recruits (x1000)
- Bigeye tuna:Recuitment
- Blue marlin:Recruits (x1000)
- Bluefin tuna:Recruitment
- North Pacific swordfish:Recruits (x1000)
- Skipjack tuna:Recruitment
- Yellowfin tuna:Recruitment
- Component Category: Highly Migratory Species
- Time Range: 1994 - 2021
- CCIEA Data Contact: barbara.muhling@noaa.gov
- Institution: NOAA SWFSC/FRD
- Source Data: Estimates of annual recruitment are derived from the stock assessment model. The latest (2023) stock assessment report was completed through the International Scientific Committee for Tuna and Tuna-like Species in the North Pacific Ocean (ISC). North Pacific albacore are considered to be one stock throughout the North Pacific Ocean. They are fished throughout their range by multiple countries, mostly using surface gear (troll and pole and line), as well as pelagic longlines and other gears. Their population dynamics are assessed using an age-, length- and sex-structured model (Stock Synthesis v3). The assessment model used was similar to that in the 2017 benchmark assessment, with four important changes: 1) adjusting coefficients of variation for the abundance index in 2020-21 to better reflect uncertainty surrounding disruptions from the COVID-19 pandemic, 2) adjustments to Japan longline fleet structure, 3) adjustments to adult abundance indices, and 4) adjustments to age selectivity. The full assessment is available from http://isc.fra.go.jp/reports/stock_assessments.html. The next benchmark assessment is expected in 2026.
Indicator Download
ERDDAP™ link:
https://oceanview.pfeg.noaa.gov/erddap/tabledap/cciea_HMS_recruit.html
References