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Dataset Title:  Cod by-catch reducing gear: video observations of fish behavior from Fishing
Vessels NEC-MP2000-2 in the Gulf of Maine from 2000-2002 (NEC-CoopRes project)
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Institution:  BCO-DMO   (Dataset ID: bcodmo_dataset_3144)
Information:  Summary ? | License ? | ISO 19115 | Metadata | Background (external link) | Files | Make a graph
Variable ?   Optional
Constraint #1 ?
Constraint #2 ?
   Minimum ?
   Maximum ?
 species ?          "cod"    "flounder"
 rope_interaction ?          "footrope"    "headrope"
 net_type ?          "ribas"    "topless"
 behavior (unitless) ?          "into_net"    "under_net"
 number (fish) ?          0    119
 time_elapsed (minutes) ?          28    60
 date_local (unitless) ?          "1/5/2001"    "12/4/2000"
 day_local (unitless) ?          "04"    "05"
 month_local (unitless) ?          "01"    "12"
 year (unitless) ?          2000    2001
 yrday_local (unitless) ?          5    339
Server-side Functions ?
 distinct() ?
? ("Hover here to see a list of options. Click on an option to select it.Hover here to see a list of options. Click on an option to select it.Hover here to see a list of options. Click on an option to select it.Hover here to see a list of options. Click on an option to select it.Hover here to see a list of options. Click on an option to select it.")

File type: (more info)

(Documentation / Bypass this form ? )
(Please be patient. It may take a while to get the data.)


The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  species {
    String bcodmo_name "species";
    String description "common name of fish";
    String long_name "Species";
  rope_interaction {
    String bcodmo_name "unknown";
    String description "which rope, head or foot, the fish interacted with in the video";
    String long_name "Rope Interaction";
  net_type {
    String bcodmo_name "unknown";
    String description "type of experimental net: Ribas or topless trawl net";
    String long_name "Net Type";
  behavior {
    String bcodmo_name "unknown";
    String description "observed net escape behavior";
    String long_name "Behavior";
    String units "unitless";
  number {
    Byte _FillValue 127;
    Byte actual_range 0, 119;
    String bcodmo_name "count";
    Float64 colorBarMaximum 100.0;
    Float64 colorBarMinimum 0.0;
    String description "number of fish exhibiting observed behavior";
    String long_name "Number";
    String units "fish";
  time_elapsed {
    Byte _FillValue 127;
    Byte actual_range 28, 60;
    String bcodmo_name "unknown";
    String description "duration of video";
    String long_name "Time Elapsed";
    String units "minutes";
  date_local {
    String bcodmo_name "date_local";
    String description "local date";
    String long_name "Date Local";
    String source_name "date_local";
    String time_precision "1970-01-01";
    String units "unitless";
  day_local {
    String bcodmo_name "unknown";
    String description "local day of month; 1-31";
    String long_name "Day Local";
    String units "unitless";
  month_local {
    String bcodmo_name "month_local";
    String description "local month of year: 1-12";
    String long_name "Month Local";
    String units "unitless";
  year {
    Int16 _FillValue 32767;
    Int16 actual_range 2000, 2001;
    String bcodmo_name "year";
    String description "year";
    String long_name "Year";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/YEARXXXX/";
    String units "unitless";
  yrday_local {
    Int16 _FillValue 32767;
    Int16 actual_range 5, 339;
    String bcodmo_name "yrday_local";
    String description "local day and decimal time. eg. 326.5 for the 326th day of the year or November 22 at 1200 hours (noon)";
    String long_name "Yrday Local";
    String units "unitless";
    String access_formats ".htmlTable,.csv,.json,.mat,.nc,.tsv";
    String acquisition_description 
"Two trawl nets, the \\\"Ribas net\\\" and a Faroe Island design prototype, were
constructed and tested at sea on a commercial vessel, against a conventional
two-seam groundfish net, which served as a control. The two experimental nets
both modify the top half of a trawl net; the Ribas by using large square mesh
and the Faroese by removing much of the twine at the top of the net. The
project goal was to reduce cod as bycatch up to 75-90% (and perhaps dogfish
(Squalus acanthias) bycatch as well). This net was designed to target the
following species: yellow tail flounder (Pleuronectes ferruginea), winter
flounder (Pleuronectes americanus), American plaice (Hippoglossoides
platessoides), windowpane flounder (Glyptocephalus cynoglossus), and skate
Seventy pairs of alternate tows with the control net resulted in reductions of
cod bycatch of >76% for both nets. Catch rates of sublegal yellowtail flounder
were also >74% lower for both nets compared to the control. There were,
however, reductions in the legal catch of yellowtail and winter flounders.
Underwater video showed cod exiting the nets through the top mesh or gap made
by removal of the twine. The results of this project have been presented to
the New England Fishery Management Council Multispecies Plan Development Team,
which encouraged participants to demonstrate the performance of the Ribas net
in off-shore areas. The participants have continued the research with
Saltonstall-Kennedy funding. However, modified versions of both nets were
included as options in Amendment 13 to the Groundfish Fishery Management Plan.
(from [final
    String awards_0_award_nid "55048";
    String awards_0_award_number "unknown NEC-CoopRes NOAA";
    String awards_0_funder_name "National Oceanic and Atmospheric Administration";
    String awards_0_funding_acronym "NOAA";
    String awards_0_funding_source_nid "352";
    String cdm_data_type "Other";
    String comment 
"Cod by-catch reducing gear: fish escape behavior 
  PI: M. Pol (Mass. Div. Mar. Fisheries) 
  dates: Dec. 2000 - May 2002";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    String creator_email "info@bco-dmo.org";
    String creator_name "BCO-DMO";
    String creator_type "institution";
    String creator_url "https://www.bco-dmo.org/";
    String data_source "extract_data_as_tsv version 2.3  19 Dec 2019";
    String date_created "2010-06-16T20:40:40Z";
    String date_modified "2020-01-22T17:55:15Z";
    String defaultDataQuery "&time<now";
    String doi "10.1575/1912/bco-dmo.3144.1";
    String history 
"2020-08-05T19:06:42Z (local files)
2020-08-05T19:06:42Z https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_3144.html";
    String infoUrl "https://www.bco-dmo.org/dataset/3144";
    String institution "BCO-DMO";
    String instruments_0_acronym "Beam trawl";
    String instruments_0_dataset_instrument_description "two experimental trawl nets, Ribas net and topless net.";
    String instruments_0_dataset_instrument_nid "4885";
    String instruments_0_description 
"A beam trawl consists of a cone-shaped body ending in a bag or codend, which retains the catch. In these trawls the horizontal opening of the net is provided by a beam, made of wood or metal, which is up to 12 m long. The vertical opening is provided by two hoop-like trawl shoes mostly made from steel. No hydrodynamic forces are needed to keep a beam trawl open.  The beam trawl is normally towed on outriggers, one trawl on each side. 
While fishing for flatfish the beam trawl is often equipped with tickler chains to disturb the fish from the seabed. For operations on very rough fishing grounds they can be equipped with chain matrices. Chain matrices are rigged between the beam and the groundrope and prevent boulders/stones from being caught by the trawl. Shrimp beam trawls  are not so heavy and have smaller mesh sizes. A bobbin of groundrope with rubber bobbins keeps the shrimp beam trawl in contact with the bottom and gives flatfish the opportunity to escape.
Close bottom contact is necessary for successful operation. To avoid bycatch of most juvenile fishes selectivity devices are assembled (sieve nets, sorting grids, escape holes). While targeting flatfish the beam trawls are towed up to seven knots, therefore the gear is very heavy; the largest gears weighs up to 10 ton. The towing speed for shrimp is between 2.5 and 3 knots.
(from: http://www.fao.org/fishery/geartype/305/en)";
    String instruments_0_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/24/";
    String instruments_0_instrument_name "Beam Trawl";
    String instruments_0_instrument_nid "521";
    String instruments_0_supplied_name "Trawl";
    String keywords "bco, bco-dmo, behavior, biological, chemical, data, dataset, date, day, day_local, dmo, elapsed, erddap, interaction, local, management, month, month_local, net, net_type, number, oceanography, office, preliminary, rope, rope_interaction, species, time, time_elapsed, type, year, yrday, yrday_local";
    String license "https://www.bco-dmo.org/dataset/3144/license";
    String metadata_source "https://www.bco-dmo.org/api/dataset/3144";
    String param_mapping "{'3144': {}}";
    String parameter_source "https://www.bco-dmo.org/mapserver/dataset/3144/parameters";
    String people_0_affiliation "Massachusetts Division of Marine Fisheries";
    String people_0_person_name "Michael Pol";
    String people_0_person_nid "50903";
    String people_0_role "Principal Investigator";
    String people_0_role_type "originator";
    String people_1_affiliation "Woods Hole Oceanographic Institution";
    String people_1_affiliation_acronym "WHOI BCO-DMO";
    String people_1_person_name "Nancy Copley";
    String people_1_person_nid "50396";
    String people_1_role "BCO-DMO Data Manager";
    String people_1_role_type "related";
    String project "NEC-CoopRes";
    String projects_0_acronym "NEC-CoopRes";
    String projects_0_description 
"The Northeast Consortium encourages and funds cooperative research and monitoring projects in the Gulf of Maine and Georges Bank that have effective, equal partnerships among fishermen, scientists, educators, and marine resource managers.
The Northeast Consortium seeks to fund projects that will be conducted in a responsible manner. Cooperative research projects are designed to minimize any negative impacts to ecosystems or marine organisms, and be consistent with accepted ethical research practices, including the use of animals and human subjects in research, scrutiny of research protocols by an institutional board of review, etc.";
    String projects_0_geolocation "Georges Bank, Gulf of Maine";
    String projects_0_name "Northeast Consortium: Cooperative Research";
    String projects_0_project_nid "2045";
    String projects_0_project_website "http://northeastconsortium.org/";
    String projects_0_start_date "1999-01";
    String publisher_name "Biological and Chemical Oceanographic Data Management Office (BCO-DMO)";
    String publisher_type "institution";
    String sourceUrl "(local files)";
    String standard_name_vocabulary "CF Standard Name Table v55";
    String summary "Cod by-catch reducing gear: video observations of fish behavior from Fishing Vessels NEC-MP2000-2 in the Gulf of Maine from 2000-2002 (NEC-CoopRes project).";
    String title "Cod by-catch reducing gear: video observations of fish behavior from Fishing Vessels NEC-MP2000-2 in the Gulf of Maine from 2000-2002 (NEC-CoopRes project)";
    String version "1";
    String xml_source "osprey2erddap.update_xml() v1.3";


Using tabledap to Request Data and Graphs from Tabular Datasets

tabledap lets you request a data subset, a graph, or a map from a tabular dataset (for example, buoy data), via a specially formed URL. tabledap uses the OPeNDAP (external link) Data Access Protocol (DAP) (external link) and its selection constraints (external link).

The URL specifies what you want: the dataset, a description of the graph or the subset of the data, and the file type for the response.

Tabledap request URLs must be in the form
For example,
Thus, the query is often a comma-separated list of desired variable names, followed by a collection of constraints (e.g., variable<value), each preceded by '&' (which is interpreted as "AND").

For details, see the tabledap Documentation.

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