<div><p>The Northeast Fisheries Science Center (NEFSC) has conducted bottom trawl surveys for juvenile and adult fish on the Northeast US Shelf since 1963 (Azarovitz 1981). The surveys were conducted in the spring (March-April) and fall (September-October) using a stratified random design. All fish for each species were counted and weighed. These data represent kg of fish per tow. Zero means no fish of that species were caught in that tow.</p>
<p>Temperature and salinity values were obtained with a surface bucket for the temperature and a surface water sample was collected for a subsequent salinity measurement. In inshore areas, a bottom salinity was also taken.</p>
<p> </p>
<p><strong>References:</strong><br />
Azarovitz TR. 1981. A brief historical review of the Woods Hole Laboratory trawl survey time series. Canadian Special Publication of Fisheries and Aquatic Sciences. 58:62-7. (<a href="http://dmoserv3.whoi.edu/data_docs/NEFSC_Bottom_Trawl/Azarovitz1981.pdf">PDF</a>)</p></div>
Adult fish biomass of the Northeast U.S. Shelf Ecosystem: 1968-2012
<div><p>Biomass data of adult fish species of the Northeast U.S. Shelf; bottom trawl surveys were conducted by the Northeast Fisheries Science Center (NEFSC) between 1963-2013.</p></div>
NEFSC Survey Adult Fish Biomass
<div><p>Biomass of adult fish was calculated yearly between 1963 and 2012 for spring and fall. The number of strata in the bottom trawl survey is 108.</p>
<p>Unlike the 'stratum' of the adult fish numbers data, the 'strata group' of the biomass data represents a code. For example offshore strata 1 is coded as 01010 with the first 01 representing the strata group, the second 01 the strata number and the last 0 the substrata (Only a few have these where a strata was broken in half). R truncates the 01 strata group to 1 so in R the offshore strata 1 is 1010. Inshore strata start with 03 and offshore south of Hatteras start with 08, inshore south of Hatteras 07, and shellfish 06.</p>
<p><strong>References:</strong></p>
<p>Azarovitz TR. 1981. A brief historical review of the Woods Hole Laboratory trawl survey time series. Canadian Special Publication of Fisheries and Aquatic Sciences. 58:62-7. (<a href="http://dmoserv3.whoi.edu/data_docs/NEFSC_Bottom_Trawl/Azarovitz1981.pdf">PDF</a>)</p>
<p>BCO-DMO Processing:<br />
- Replaced spaces with underscores in taxa names.<br />
- Modified parameter names to conform with BCO-DMO naming conventions.<br />
- Replaced 'NA' in environmental measurements with 'nd'. Replaced 'NA' in fish biomass columns with '0'.</p></div>
637753
NEFSC Survey Adult Fish Biomass
2016-02-02T17:13:49-05:00
2016-02-02T17:13:49-05:00
2023-07-07T16:10:26-04:00
urn:bcodmo:dataset:637753
Adult fish biomass of the Northeast U.S. Shelf Ecosystem from NOAA Ship Trawl-Survey-Vessel NEFSC-Bottom_Trawl in the Coast of U.S. between Cape Hatteras and Nova Scotia from 1963-2013 (NEFSCBottomTrawl project)
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Kleisner, K. (2016) Adult fish biomass of the Northeast U.S. Shelf Ecosystem from NOAA Ship Trawl-Survey-Vessel NEFSC-Bottom_Trawl in the Coast of U.S. between Cape Hatteras and Nova Scotia from 1963-2013 (NEFSCBottomTrawl project). Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version final) Version Date 2016-02-02 [if applicable, indicate subset used]. http://lod.bco-dmo.org/id/dataset/637753 [access date]
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2016-02-02
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