AFSC/RACE/SAP/Urban: Snow Crab Handling Mortality

Description

Fish and invertebrates that are unintentionally captured during commercial fishing operations and then released back into the ocean suffer mortality at unknown rates, introducing uncertainty into the fishery management process. Attempts have been made to quantify discard mortality rates using reflex action mortality predictors or RAMP which use the presence or absence of a suite of reflexes to predict discard mortality. This method was applied to snow crab, Chionoecetes opilio, during the 2010-2012 fisheries in the Bering Sea. Discard mortality in the fishery is currently assumed to be 50% in stock assessment models, but that rate is not based on empirical data and is widely recognized to be in need of refinement. Over 19,000 crab were evaluated using the RAMP method. The estimated discard mortality rate was 4.5% (SD = 0.812), significantly below the rate used in stock assessment models. Predicted discard mortality rates from the 2010-2012 study were strongly correlated with the air temperature at the St. Paul Island airport in the Pribilof Islands. Using this relationship the discard mortality rate from 1991-2011was estimated at 4.2% (SD = 1.08).

Resources

Name Format Description Link
0 AKFSC Home Page https://www.fisheries.noaa.gov/about/alaska-fisheries-science-center
33 NOAA Data Management Plan for this record on InPort. https://www.fisheries.noaa.gov/inportserve/waf/noaa/nmfs/afsc/dmp/pdf/26528.pdf
8 AFSC/RACE/SAP/Urban: Snow Crab Handling Mortality Note: Dataset migrated by Dan Woodrich (AFSC data management coordinator) on 12/15/2021. Contact: Daniel.woodrich@noaa.gov https://console.cloud.google.com/storage/browser/_details/nmfs_odp_afsc/RACE/SAP/Urban%3B%20Snow%20Crab%20Handling%20Mortality.csv
0 View the complete metadata record on InPort for more information about this dataset. https://www.fisheries.noaa.gov/inport/item/26528
0 The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. https://www.earthdata.nasa.gov/learn/find-data/idn/gcmd-keywords

Tags

  • alaska fisheries science center
  • alaska
  • noaa
  • mortality
  • shellfish assessment program
  • u.s. department of commerce
  • national marine fisheries service
  • doc/noaa/nmfs/afsc
  • bering sea

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