Objective: To relate to oceanographic conditions the horizontal and vertical distribution of sea scallop larvae (Placopecten magellanicus) in the Canadian Gulf of Maine area (Bay of Fundy, western Scotian Shelf and Georges Bank)\n\nRecords in this dataset were digitized as part of an ongoing data recovery activity. Version 1 of the dataset contains counts of larvae per sample for cruises conducted in 1984. Abundance information (#/m3) is not included in this version. Records indicate the number of individual scallop larvae sized but these measurements are not included in this version.
","language":"eng","homepage":"http://iobis.org/mapper/?resource_id=XXXX","citation":{"text":"Tremblay M (2026). DFO-Maritimes: Planktonic sea scallop larvae in the Canadian Gulf of Maine: Distribution and abundance data 1984-1988.. Fisheries and Oceans Canada. Occurrence dataset https://doi.org/10.15468/zpuh6w accessed via GBIF.org on 2026-10-12.","identifier":"http://iobis.org/mapper/?resource_id=XXXX","citationProvidedBySource":false},"contactsCitation":[{"key":6911766,"abbreviatedName":"Tremblay M","firstName":"M.J.","lastName":"Tremblay","roles":["ORIGINATOR","METADATA_AUTHOR"],"userId":[]}],"lockedForAutoUpdate":false,"createdBy":"c98a8d0d-cab2-4506-8c0f-c91a5e4996b9","modifiedBy":"crawler.gbif.org","created":"2026-02-13T16:23:04.579+00:00","modified":"2026-02-13T16:24:05.420+00:00","contacts":[{"key":6911766,"type":"ORIGINATOR","primary":true,"userId":[],"firstName":"M.J.","lastName":"Tremblay","position":["Research Scientist"],"email":["john.tremblay@dfo-mpo.gc.ca"],"phone":[],"homepage":[],"organization":"Fisheries and Oceans Canada","address":["Bedford Institute of Oceanography"],"city":"Dartmouth","province":"Nova Scotia","country":"CA","postalCode":"B2Y 4A2","createdBy":"crawler.gbif.org","modifiedBy":"crawler.gbif.org","created":"2026-02-13T16:24:05.395+00:00","modified":"2026-02-13T16:24:05.395+00:00"},{"key":6911767,"type":"METADATA_AUTHOR","primary":true,"userId":[],"firstName":"M.J.","lastName":"Tremblay","position":["Research Scientist"],"email":["john.tremblay@dfo-mpo.gc.ca"],"phone":[],"homepage":[],"organization":"Fisheries and Oceans Canada","address":["Bedford Institute of Oceanography"],"city":"Dartmouth","province":"Nova Scotia","country":"CA","postalCode":"B2Y 4A2","createdBy":"crawler.gbif.org","modifiedBy":"crawler.gbif.org","created":"2026-02-13T16:24:05.398+00:00","modified":"2026-02-13T16:24:05.398+00:00"},{"key":6911768,"type":"ADMINISTRATIVE_POINT_OF_CONTACT","primary":true,"userId":[],"firstName":"M.J.","lastName":"Tremblay","position":["Research Scientist"],"email":["john.tremblay@dfo-mpo.gc.ca"],"phone":[],"homepage":[],"organization":"Fisheries and Oceans Canada","address":["Bedford Institute of Oceanography"],"city":"Dartmouth","province":"Nova Scotia","country":"CA","postalCode":"B2Y 4A2","createdBy":"crawler.gbif.org","modifiedBy":"crawler.gbif.org","created":"2026-02-13T16:24:05.400+00:00","modified":"2026-02-13T16:24:05.400+00:00"}],"endpoints":[{"key":1242762,"type":"DWC_ARCHIVE","url":"https://ipt.iobis.org/obiscanada/archive.do?r=mar_tremblay_scalloplarva","createdBy":"c98a8d0d-cab2-4506-8c0f-c91a5e4996b9","modifiedBy":"c98a8d0d-cab2-4506-8c0f-c91a5e4996b9","created":"2026-02-13T16:23:04.720+00:00","modified":"2026-02-13T16:23:04.720+00:00","machineTags":[]},{"key":1242761,"type":"EML","url":"https://ipt.iobis.org/obiscanada/eml.do?r=mar_tremblay_scalloplarva","createdBy":"c98a8d0d-cab2-4506-8c0f-c91a5e4996b9","modifiedBy":"c98a8d0d-cab2-4506-8c0f-c91a5e4996b9","created":"2026-02-13T16:23:04.680+00:00","modified":"2026-02-13T16:23:04.680+00:00","machineTags":[]}],"machineTags":[{"key":33142692,"namespace":"crawler.gbif.org","name":"crawl_attempt","value":"30","createdBy":"crawler.gbif.org","created":"2026-10-12T02:22:05.241+00:00"}],"tags":[],"identifiers":[{"key":463560,"type":"URL","identifier":"https://ipt.iobis.org/obiscanada/resource?r=mar_tremblay_scalloplarva","createdBy":"crawler.gbif.org","created":"2026-02-13T16:24:05.402+00:00","primary":false}],"comments":[],"bibliographicCitations":[{"text":"Tremblay, M.J. and M.M. Sinclair. 1988. The vertical and horizontal distribution of sea scallop (Placopecten magellanicus) larvae in the Bay of Fundy in 1984 and 1985. Journal Northwest Atlantic Fisheries Science, Vol. 8: 43-53. Http://journal.nafo.inthttp://journal.nafo.int/intro/volumes_.html","citationProvidedBySource":false},{"text":"Tremblay M. J., Meade L. D., Hurley G. V. 1987. Identification of planktonic sea scallop larvae (Placopecten magellanicus ) (Gmelin). Canadian Journal of Fisheries and Aquatic Sciences. 44:1361-1366.","citationProvidedBySource":false}],"curatorialUnits":[],"taxonomicCoverages":[{"description":"sea scallop larvae","coverages":[{"scientificName":"Placopecten magellanicus","rank":{"verbatim":"species","interpreted":"SPECIES"}}]}],"geographicCoverages":[{"description":"Bay of Fundy, Gulf of Maine","boundingBox":{"minLatitude":41.728,"maxLatitude":45.636,"minLongitude":-68.283,"maxLongitude":-64.783,"globalCoverage":false}}],"temporalCoverages":[{"@type":"range","start":"1984-09-06T00:00:00.000+00:00","end":"1984-09-09T00:00:00.000+00:00"},{"@type":"range","start":"1984-10-10T00:00:00.000+00:00","end":"1984-10-15T00:00:00.000+00:00"},{"@type":"range","start":"1984-11-03T00:00:00.000+00:00","end":"1984-11-14T00:00:00.000+00:00"},{"@type":"range","start":"1985-10-01T00:00:00.000+00:00","end":"1985-10-11T00:00:00.000+00:00"}],"keywordCollections":[{"thesaurus":"GBIF Dataset Type Vocabulary: http://rs.gbif.org/vocabulary/gbif/dataset_type.xml","keywords":["occurrence"]},{"thesaurus":"GBIF Dataset Subtype Vocabulary: http://rs.gbif.org/vocabulary/gbif/dataset_subtype.xml","keywords":["Observation"]},{"thesaurus":"GBIF Dataset Type Vocabulary: http://rs.gbif.org/vocabulary/gbif/dataset_type_2015-07-10.xml","keywords":["Occurrence"]}],"project":{"title":"Larval scallop survey","contacts":[{"type":"POINT_OF_CONTACT","primary":false,"userId":[],"lastName":"Fisheries and Oceans canada","position":[],"email":[],"phone":[],"homepage":[],"address":[]}],"awards":[],"studyAreaDescription":"It is MEDS MISSION DESCRIPTOR 183184001. We have 8 bathythermograph stations from Sep 7 to 13, 1984. See attached plot; third subplot from the top, left-hand side, for geographical distribution (Bay of Fundy). ISDM-MEDS\n\nmeds also mentions: I see a Scallop larvae survey from Oct 9 to 16 with J. Tremblay in region NAFO 4X, aboard the E.E. Prince. But it's a month later, and there are no mentions of a chartered ship named \"John Eric III\" anywhere in the 1985 BIO report. Other than that, there is a Needler cruise mentioned in the BIO report, by L.M. Dickie, from Sep 6 to 13 1984, called \"Acoustic experimental survey\".","relatedProjects":[]},"samplingDescription":{"studyExtent":"Scallop larvae were collected in the Bay of Fundy during three periods in 1984 (6-13 September, 10-15 October and 3-14 November) and from 1 to 6 October 1985.\nLarvae were also collected on the Scotian Shelf, the Gulf of Maine and Georges Bank during 6-11 October 1985. Georges Banks was the focus of sampling from 1986-88.\n\nCruise information is as follows\n(date: vessel; and the MEDS standardized cruise number, the MEDS mission descriptor)\nSeptember 1984: John Eric III; 183184001\nOctober 1984: E.E. Prince P313; 18PE84313 \nNovember 1984: E.E. Prince P315; 18PE84315\nOctober 1985: Lady Hammond LH142; 18LH85142","sampling":"The ship remained as stationary as possible during the 5 to 15 min it took to complete the sampling at any one station. \nThe bongo frame with nets was lowered to within 5 m of the bottom (or to 200 m) and towed to the surface at a speed of approximately 40 m per minute. The mean volume of water sampled per plankton tow was less than 32 m3, with the range of volumes sampled (3 to 109 m3) reflecting the station depth and the angle of the wire towing the net.\nThe vertical distribution of sea scallop larvae was studied at selected stations in 1984 using a pump system, which delivered 350 to 450 litres per minute. The pump system consisted of a FLYGT model 2051 electric pump (impeller type) with a tandem coupling, 2.5 cm PVC suction hose, and a SIGNET in-line paddlewheel flowsensor and readout.\nFor most stations, the ship drifted during pump sampling because anchoring was usually not possible in the tidally energetic sampling areas. Pump stations took 1.5 to 2.5 hr to complete, drift from the original location could be up to 9 nautical miles (anchoring was not an option due to the effects of high tidal currents on gear deployment). The FLYGT pump was deployed 1 to 1.5 m below the surface, with a long length of hose approximately 50 m to sample a 40 m depth) attached to the suction side and a short length on the delivery side leading to the ships deck. During sampie collection, the intake end of the hose was attached to the end of a wire and moved slowly up and down within the following depth intervals: 0.5 to 5 m; 6 to 10m; 11 to 20 m; 21 to 40 m. Two samples were taken within each depth interval. These intervals were modified for Georges Bank.\nOn deck, the water was passed through two NITEX nets suspended in a 160 litre drum. The first net (333pm mesh) removed larger zooplankters; the second net (64 pm mesh) retained scallop larvae. Repetitive evaluation of the contents of the 333 pm net samples indicated no scallop larvae were retained. Within the collection drum, the nets were submerged and the incoming water was not forced directly over the mesh, thus scallop larvae were collected in good condition. At all pump stations temperature profiles were obtained using expendable bathythermographs (XBTs).\nTo determine the abundance and length frequency of scallop larvae close to the seabed, an epibenthic sled was utilized in 1985. The sled was a modified version of the Macer-GIROQ model (Brunei et al., 1978) optimized for hard bottom sampling. It had two 85 pm mesh plankton nets, 55 cm wide at the mouth, mounted 33 to 73 cm, and 109 to 149 cm above the seabed. The sled was towed at a speed of 2.5 to 3 knots for 4 min. Unfortunately the sled could only be used sparingly due to time constraints and net damage. Although net tears prevented accurate determination of larval concentrations, the samples were used to indicate the length frequency of larvae close to the bottom. \n\nIn 1985 only, scallop larvae were sampled by pump at an anchor station for 50 hours (Tremblay and Sinclair 1990).\n\nSea scallop larvae from all sampling methods were preserved in 4% formalin in seawater buffered with sodium borate. The physical separation and taxonomic identification of the scallop larvae is described in Tremblay et al. (1987). Length was measured as the greatest dimension parallel to the hinge.\n\nDetailed Sampling procedures\n1. On arrival on station, the ship will remain as stationary as possible during sampling. If excessive drift occurs, return to the original location may be necessary.\n2. At each station the following sampling routine will be followed:\n-XBT cast\n-a 57 cm diameter net (120 u mesh) with flow meter fixed to the mouth will be attached to the wire\n-the initial flow meter reading will be taken\n-after determining bottom depth, the net will be lowered to within 2m of the bottom, making any necessary corrections for the wire angle\n-the net will be raised vertically at an approximate speed of 45m per minute.\n-the net will be raised above the surface and the sides washed down thoroughly\n-the final flow meter will be taken\n-the cod end bucket will be removed, the contents transferred to a 1 litre collection jar and 40ml of formalin added.\n-replicate tows were made\n3. at selected stations, additional sampling with the plankton pump system were carried out as follows:\n-appropriate length of PVC suction hose assembled and fixed to pump intake\n-flow sensor inserted into PVC pipe and appropriate electrical connections made\n-the intake end of the hose will be fixed to the winch and lowered to 5m making any necessary corrections for the wire angle\n-the pump will be turned on and run for a minute or so, after which the small diameter 330u and 120u mesh nets can be fixed below the PVC point of delivery ( i.e. within the drium)\n-using the winch, the intake end of the hose will be slowly raised and lowered within the depth interval of 1m to 5m.\n-after the filtration of 5,000 to 6,000l (as indicated by flowmeter), the nets will be removed from the drum\n-the contents of the 120u net will be washed into a 1L collection jar and 20ml of formalin added. The contents of the 330u net can be discarded.\n-a replicate sample in the depth range of 1m to 5m can be taken\n-repeating the above procedures, two replicate samples will be taken in the following depth ranges: 5-10m; 10-20m; 20-40m; bottom-5m off the bottom.","qualityControl":"only one scientific name in dataset. Scientific names listed in the survey's species list have been mapped to the World Register of Marine Species (WoRMS) using their Taxon Match tool. The WoRMS AphiaID codes have been included in this resource in the scientificNameID field as LSIDs. \n\nstation positions from herring larvae survey. Coordinates plotted and verified.","methodSteps":["For each bongo sample, the flowmeter reading, tow duration and mouth area of the net were used to calculate total volume sampled by the net. Larval counts were then converted to a number per m2 basis as follows:\nN per m2 =(Count/volume in m3) x station depth (m)\nGenerally the larvae from only one of the bongo nets were sorted; where both samples were done, they were combined for the purposes of analysis. Larval counts from the pump samples were converted to numbers per m3 using the volume measured by the in line flowsensor.","The original datasheets associated with this project were obtained from the data provider and digitized by OBIS Canada. \n\nThe digitized dataset along with associated metadata has been provided to DFO Maritimes for future archival in the Fisheries and Oceans national BioChem database (recommended series identifier='MAR_Tremblay_ScallopLarva'). \n\nAn OBIS resource was then created by OBIS Canada. Darwin Core (DwC) records were extracted in the required IPT format. \n\nVersion 1 contains counts of larvae per sample for cruises conducted in 1984 only. Abundance information (#/m3) is not included in this version. Records indicate the number of individuals sized but these measurements are not included in this version.","Fisheries and Oceans Canada mission descriptors associated with the various cruises were obtained from DFO-ISDM/MEDS, Ottawa."]},"countryCoverage":[],"collections":[],"dataDescriptions":[],"dataLanguage":"eng","purpose":"These data are for display on the OBIS portal and associated mapping programs and for download to personal computers for ad-hoc end-user analysis.
","additionalInfo":"Access Constraints: none \nUse Constraints: Acknowledge the use of specific records from contributing databases in the form appearing in the 'Citation' field thereof (if any); and acknowledge the use of the OBIS facility. \nFor information purposes, email to info@iobis.org the full citation of any publication made (printed or electronic) that cites OBIS or any constituent part. \nRecognize the limitations of data in OBIS. See http://www.iobis.org/data/policy/disclaimer for more details \nFor OBIS Schema concept details see http://www.iobis.org/node/304 \nDistribution Media: HTTP \nDistribution Format: OBIS Schema \nFees: None","pubDate":"2026-02-13T00:00:00.000+00:00","maintenanceUpdateFrequency":"DAILY","maintenanceDescription":"","license":"http://creativecommons.org/licenses/by/4.0/legalcode","dwca":{"coreType":"http://rs.tdwg.org/dwc/terms/Occurrence","extensions":[],"modified":"2026-07-12T19:53:18.096+00:00"},"approximateCounts":{"occurrenceCount":240}}