<div><p><b>Project reports:</b></p>
<p>Herring Acoustic Survey (Year 6) <a href="/objectserver/8a3743ff1df4ae5a0199676a88b54cdb/ProjectFileDownload.pm?url=http%3A%2F%2Fnortheastconsortium.org%2FProjectFileDownload.pm%3Freport_id%3D830%26amp%3Btable%3Dproject_report&f=3161343065626131386338636537306466376664373437363236346336383334687474703a2f2f6e6f72746865617374636f6e736f727469756d2e6f72672f50726f6a65637446696c65446f776e6c6f61642e706d3f7265706f72745f69643d38333026616d703b7461626c653d70726f6a6563745f7265706f7274">Final Report</a> - July 2007 <br />
Herring Survey Mid-Year <a href="/objectserver/eb341f90fd7ee3145c32298268aff1c6/ProjectFileDownload.pm?url=http%3A%2F%2Fnortheastconsortium.org%2FProjectFileDownload.pm%3Freport_id%3D654%26amp%3Btable%3Dproject_report&f=6335663437643736643361353064356536666532383936316137633163623638687474703a2f2f6e6f72746865617374636f6e736f727469756d2e6f72672f50726f6a65637446696c65446f776e6c6f61642e706d3f7265706f72745f69643d36353426616d703b7461626c653d70726f6a6563745f7265706f7274">Progress Report</a> - December 2006</p>
<p>"The temporal and special characteristics of spawning herring aggregations in coastal Gulf of Maine waters have been studied during the fall since 1998. The program has attempted to estimate the biomass of herring spawning in these waters during the fall months to establish an index of spawning stock biomass. Surveys have been conducted from Cape Ann, Massachusetts to Cutler, Maine. Each year, techniques have been refined for implementing acoustic surveys and collecting representative biological samples on fishing vessels.</p>
<p>In March 2005, the Northeast Consortium funded and facilitated an independent peer review, which concluded that acoustic surveys are an appropriate way to survey herring in this area and recommended continuation of the project. It also recommended that future surveys focus on estimating biomass using a broad-scale systematic survey approach, as well as developing an annual "sentinel" acoustic survey of the important spawning grounds. This project continues with additional funds from the Northeast Consortium granted in 2005. The panel's recommendations are being incorporated into the work, with surveys focused on identifying and quantifying "sentinel" spawning grounds." <i>extracted from: Summary of Completed Cooperative Research Projects Funded by the Northeast Consortium, September 2006</i></p>
<p><b>Sub Areas</b></p>
<p>Each survey leg was apportioned into geographical sub areas prior to data analysis in order to allow for more precise target strength calculations for individual aggregations of fish. For any given leg, the observed distribution of Atlantic herring as well as the locations and distribution of biological sample tows were used to define between two and four unique sub areas for the leg. Data from all biological sample tows conducted within a given sub area were combined before calculating a target strength. This process should reduce the variance within each sub area biomass estimate and accounted for multiple sampling of the same fish aggregations.</p></div>
Inshore Gulf of Maine Acoustic Survey of Atlantic Herring Sentinel Spawning Grounds: biological sample data: size, sex, maturity
<div><p><b>Inshore Gulf of Maine Acoustic Survey of Atlantic Herring Sentinel Spawning Grounds</b></p>
<p>Atlantic Herring biological sample data: size, sex, maturity</p></div>
herring spawng grounds_fish size
<div><p>When significant aggregations of fish were detected acoustically, the midwater trawl was set to confirm species identity and to collect approximately 100 individual Atlantic herring. Tows were conducted along the transect line after passing over the fish aggregations. Tow times were generally short in duration (10 - 20 minutes); just long enough to collect the necessary samples. All herring samples were frozen at sea for further laboratory analysis.</p>
<p>Back in the laboratory, herring samples were thawed out for examination. Natural length measurements were taken to the nearest 5 mm, total weight to the nearest 0.1 g, gonad weight to the nearest 0.1 g, sex and International Commission for the Northwest Atlantic Fisheries (ICNAF) gonad development stage (Table 3). In order to account for freezing and thawing of herring samples, length measurements were corrected using Maine Department of Marine Resources' correction equation:</p>
<p>Lmm = 4.1825 + 1.0051 * [Frozen Sample Length (mm)].</p>
<p><strong>Stage Description and Criteria</strong><br />
ICNAF Atlantic herring gonad development stages (from Burnett et al., 1989).</p>
<p>I<br />
Immature: testes and ovaries very small, threadlike, 2 - 3 mm broad; testes grayish<br />
white or brownish red; ovaries pinkish or wine red.<br />
II<br />
Immature fish that will spawn next year: testes and ovaries small, 3 - 8 mm broad;<br />
testes reddish or grayish brown; ovaries orange-red; eggs visible only with<br />
microscope.<br />
III<br />
Ripening, early stage: testes and ovaries occupy about half of ventral cavity, 1 - 2<br />
cm broad; testes grayish or brownish red; ovaries orange-red; eggs small, but visible<br />
and granular.<br />
IV<br />
Ripening, mid-stage: testes and ovaries almost as long as body cavity; testes reddish<br />
yellow with blood vessels clearly visible; ovaries orange-red or pale yellow-red; eggs<br />
larger, opaque with only a few clear.<br />
V<br />
Ripe: testes and ovaries fill body cavity; milt and eggs do not flow, but can be<br />
extruded by pressure; testes yellowish white or milk white with no reddish color and<br />
blood vessels not visible; ovaries yellowish; eggs large and mostly clear.<br />
VI<br />
Spawning: testes and ovaries ripe and emptying; milt and eggs flow freely; testes<br />
white or pale yellowish white with no blood vessels visible; ovaries yellowish; eggs<br />
large and clear.<br />
VII <br />
Spent: testes and ovaries baggy, flabby and bloodshot; testes empty or with residual<br />
milt; ovaries empty or with few residual eggs.<br />
VIII<br />
Resting: testes and ovaries firm and larger than in Stage II; walls striated with blood<br />
vessels prominent; testes brownish red; ovaries wine red; eggs not visible to naked<br />
eye.</p></div>
2981
herring spawng grounds_fish size
2010-06-16T16:40:39-04:00
2010-06-16T16:40:39-04:00
2023-07-07T16:10:26-04:00
urn:bcodmo:dataset:2981
Inshore Gulf of Maine Acoustic Survey of Atlantic Herring Sentinel Spawning Grounds: size, sex, maturity from the F/V Jennifer & Emily NEC-JA2005-1 from the Gulf of Maine, 2006 (NEC-CoopRes project)
false
Annala, J., Sullivan, P., Cieri, M. (2009) Inshore Gulf of Maine Acoustic Survey of Atlantic Herring Sentinel Spawning Grounds: size, sex, maturity from the F/V Jennifer & Emily NEC-JA2005-1 from the Gulf of Maine, 2006 (NEC-CoopRes project). Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 30 Jan 2009) Version Date 2009-01-30 [if applicable, indicate subset used]. http://lod.bco-dmo.org/id/dataset/2981 [access date]
true
30 Jan 2009
false
2009-01-30
HTML
https://www.bco-dmo.org/dataset/2981
text/html
Datapackage.json
Frictionless Data Package
https://www.bco-dmo.org/dataset/2981/datapackage.json
application/vnd.datapackage+json
PDF
https://www.bco-dmo.org/dataset/2981/Dataset_description.pdf
application/pdf
JSON-LD
https://www.bco-dmo.org/dataset/2981.json
application/ld+json
Turtle
https://www.bco-dmo.org/dataset/2981.ttl
text/turtle
RDF/XML
https://www.bco-dmo.org/dataset/2981.rdf
application/rdf+xml
ISO 19115-2 (NOAA Profile)
https://www.bco-dmo.org/dataset/2981/iso
application/xml
http://www.isotc211.org/2005/gmd-noaa
Dublin Core
https://www.bco-dmo.org/dataset/2981/dublin-core
application/xml
http://purl.org/dc/elements/1.1/
2981
http://lod.bco-dmo.org/id/dataset/2981
<http://www.opengis.net/def/crs/OGC/1.3/CRS84> POLYGON ((-70.7417 42.5812, -70.2273 42.5812, -70.2273 43.3718, -70.7417 43.3718, -70.7417 42.5812))
JGOFS
http://www.opengis.net/def/crs/OGC/1.3/CRS84
-70.7417
42.5812
-70.2273
43.3718
42.976499999997
-70.484499999994