©2020 Biological and Chemical Oceanography Data Management Office.Funded by the U.S. National Science Foundation
©2020 Biological and Chemical Oceanography Data Management Office.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)| Dataset Name | PI-Supplied Description | PI-Supplied Name |
|---|---|---|
| Benthic habitat correlates of juvenile fish: large inverts & fish, from F/V North Star NEC-MD2001-2 in the Gulf of Maine from 2002-2003 (NEC-CoopRes project) | 2 meter beam trawl | Trawl |
| Collection and locality information by taxon of Hemichordata from global sites, Table 1, Cannon et al (2013) Biol. Bull. (Antarctic Inverts project) | A modified Beam Trawl. USAP Standard 5-ft. net, robust net and frame system good for exploratory fishing. Qualitative sampling device used to sample large numbers of the megabenthos and benthopelagic fauna It is a double sided trawl adapted from the fishing gear of coastal fishermen. Named after the American naturalist Alexander Agassiz. Also called the Blake trawl or Sigsbee trawl (the name of the ship used by Alexander Agassiz and the captain of that ship respectively). from https://www.isa.org.jm/agassiz-trawl | Blake or Agassiz trawl |
| Collection and locality information of Hemichordata and Echinodermata from global sites, Table S1, Cannon et al (2014) Curr. Bio. (Antarctic Inverts project) | A modified Beam Trawl. USAP Standard 5-ft. net, robust net and frame system good for exploratory fishing. Qualitative sampling device used to sample large numbers of the megabenthos and benthopelagic fauna It is a double sided trawl adapted from the fishing gear of coastal fishermen. Named after the American naturalist Alexander Agassiz. Also called the Blake trawl or Sigsbee trawl (the name of the ship used by Alexander Agassiz and the captain of that ship respectively). from https://www.isa.org.jm/agassiz-trawl | Blake or Agassiz trawl |
| Data on chorion thickness from embryos studied in an experiment on CO2 sensitivity of Northern sand lance (Ammodytes dubius) embryos conducted in 2018 | beam trawl (6 mm mesh) | |
| Cod by-catch reducing gear: fishing log from Fishing Vessels NEC-MP2000-2 in the Gulf of Maine from 2000-2002 (NEC-CoopRes project) | two experimental trawl nets, Ribas net and topless net. | Trawl |
| 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) | two experimental trawl nets, Ribas net and topless net. | Trawl |
| Groundfish Trawl Nets Designed to Reduce the Bycatch of Cod: catch data from Fishing Vessels NEC-MP2000-2 in the Gulf of Maine from 2000-2002 (NEC-CoopRes project) | Tested two experimental trawl nets, Ribas net and topless net. | Beam Trawl |
| Sea spider Pallenopsis sampling sites and COI NCBI accessions from Table 1, Harder et al (2016) Polar Biology (Antarctic Inverts project) | Blake trawl | |
| Hatch data from experiments on CO2 sensitivity of Northern sand lance (Ammodytes dubius) embryos conducted in 2018 and 2020 | beam trawl (6 mm mesh) | |
| Knotless Codend Mesh Selectivity: fish catch data, Gulf of Maine, from F/V Jeanne C. NEC-KP2002-1 from April to July 2003 (NEC_ProjDev project) | groundfish trawl | Trawl |
| Morphometric data from experiments on CO2 sensitivity of Northern sand lance (Ammodytes dubius) embryos conducted in 2018 and 2020 | beam trawl (6 mm mesh) | |
| Morphometrics of northern sand lance Ammodytes dubius offspring reared under factorial CO2 x temperature conditions | Spawning-ripe sand lance were collected using a beam trawl. | beam trawl |
| Survival of northern sand lance Ammodytes dubius offspring under factorial CO2 x temperature conditions | Spawning-ripe sand lance were collected using a beam trawl. | beam trawl |
| Fish length, weight and stomach contents (prey) data in Southeastern Alaska from R/V John N. Cobb SECM, multiple cruises in the Gulf of Alaska, Coastal Southeast Alaska from 1997-2006 (NEP project) | Nordic 264 rope trawl modified to fish the surface water directly astern of the NOAA ship John N. Cobb. The trawl was 184 m long and had a mouth opening of 24 m by 30 m (depth by width). A pair of 3-m foam-filled Lite trawl doors, each weighing 544 kg (91 kg submerged), was used to spread the trawl open. Earlier gear trials with this vessel and trawl indicated the actual fishing dimensions of the trawl to be 18 m vertical (head rope to foot rope) and 24 m horizontal (wingtip to wingtip), with a spread between the trawl doors ranging from 52 m to 60 m (Orsi et al., unpubl. cruise report 1996). Trawl mesh sizes from the jib lines aft to the cod end were 162.6 cm, 81.3 cm, 40.6 cm, 20.3 cm, 12.7 cm, and 10.1 cm over the 129.6-m meshed length of the rope trawl. A 6.1-m long, 0.8-cm knotless liner was sewn into the cod end. The trawl also contained a small mesh panel of 10.2-cm mesh sewn along the jib lines on the top panel of the trawl between the head rope and the 162.6-cm mesh to reduce loss of small fish. To keep the trawl headrope at the surface, a cluster of three A-4 Polyform buoys, each encased in a knotted mesh bag, was tethered to each wingtip of the headrope, and one A-3 Polyform float was clipped onto the center of the headrope. The trawl was fished with 137 m of 1.6-cm wire main warp attached to each door and three 55-m (two 1.0-cm and one 1.3-cm) wire bridles. | Trawl |
| Improving the Size Selectivity for Northern Shrimp Through Use of a Combination of a Modified Nordmore Grate and Square Mesh Cod End: shrimp catch data, from the F/V Jeanne C. NEC-KP2003-1 from the Gulf of Maine, 2003-2004 (NEC-CoopRes project) | trouser trawl using various configurations of a compound Nordmore grate and diamond or square mesh in the lengthening piece and cod end. | Trawl |
| Improving the Size Selectivity for Northern Shrimp Through Use of a Combination of a Modified Nordmore Grate and Square Mesh Cod End: shrimp and fish catch from F/V Jeanne C. NEC-KP2003-1 in the Gulf of Maine, 2003-2004 (NEC-CoopRes project) | Trouser trawl using various configurations of a compound Nordmore grate and diamond or square mesh in the lengthening piece and cod end. | Trawl |
| Improving the Size Selectivity for Northern Shrimp Through Use of a Combination of a Modified Nordmore Grate and Square Mesh Cod End: tows from the F/V Jeanne C, Gulf of Maine, 2003-2004 (NEC-CoopRes project) | Trouser trawl using various configurations of a compound Nordmore grate and diamond or square mesh in the lengthening piece and cod end. | Trawl |
| Use of Kites in Shrimp Codends to Reduce Small Shrimps and Bycatch Species from F/V North Star NEC-PH2003-1 in the Gulf of Maine from February to May 2004 (NEC-CoopRes project) | modified shrimp trawl | Trawl |
| Bycatch of regulated species and the Nordmore grate in the Gulf of Maine shrimp fishery from Fishing Vessels NEC-SE2007-1 in the Gulf of Maine from 2009-2009 (NEC-CoopRes project) | The Nordmore grate consists of a rigid or semi-rigid grate of parallel bars attached to a rigid frame, with a bar spacing not exceeding 1 inch (50 CFR 648.80, 2009). The grate must be inserted in the trawl net at angle of approximately 45 degrees. The grate is oriented to exclude bycatch through a triangular escape opening located either in the top or bottom of the codend. The base of the escape opening must measure at least 19 inches across and be located immediately ahead of the grate; the sides of the escape opening are cut on an all-bar taper to an apex. If desired, a second grate with a bar spacing not exceeding 7/16th of an inch can be located 6 to 10 feet behind the first grate. The second grate is designed to exclude small shrimp from the trawl net. | Beam Trawl |
| Data on hatching frequency and success from an experiment on CO2 sensitivity of Northern sand lance (Ammodytes dubius) embryos conducted in 2020 | beam trawl (6 mm mesh) | |
| Abundance data from Aleutians offshore epibenthic trawls from R/V Oceanus OC1606A, OC1707A, 2016-2017 (Kelp Forest Ecosystem Engineer Loss project) | A 3.05 m plumb-staff beam trawl with a 7-mm mesh and a 4-mm codend liner | |
| Biomass data from Aleutians offshore epibenthic trawls from R/V Oceanus OC1606A, OC1707A, 2016-2017 (Kelp Forest Ecosystem Engineer Loss project) | A 3.05 m plumb-staff beam trawl with a 7-mm mesh and a 4-mm codend liner | |
| Data on unhatched embryos from an experiment on CO2 sensitivity of Northern sand lance (Ammodytes dubius) embryos conducted in 2018 | beam trawl (6 mm mesh) |