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Eulachon migration bottom trawl surveys

Dataset homepage

Citation

Nottingham M, Hodes V (2022). Eulachon migration bottom trawl surveys. Version 1.5. Fisheries and Oceans Canada. Sampling event dataset https://doi.org/10.15468/up4gwb accessed via GBIF.org on 2025-06-13.

Description

Catch, effort, location (latitude and longitude), and associated biological data from the Eulachon Migration Study Bottom Trawl surveys on the coast of British Columbia.

Sampling Description

Study Extent

EUL-S covered portions of the Strait of Georgia and Juan de Fuca Strait in Pacific Fishery Management areas (PFMA’s) 17-20, 28, 29, and 121. There were nine trips conducted from October, 2017 to March, 2018 and one trip in January, 2019. Eul-N consists of seven trips conducted between July, 2018 and March, 2019 mainly in Chatham Sound with sets in Hecate Strait, and Portland Inlet (Pacific Fishery Management areas (PFMA’s) 3, 4, and 104).

Sampling

Fishing was conducted using the Canadian Coast Guard Research Vessel Neocaligus to tow an American shrimp trawl net (Cantrawl Nets Ltd., Richmond, BC). The horizontal opening of the polypropylene net was estimated to be 34 to 37 feet (10 to 11 m), while the center of the opening had a vertical height of approximately 7 to 9 feet (2 to 3 m). A 0.4” (10 mm) liner was used in the codend. The net was configured with roller gear and 72” (1.8 m) Thyboron Type 2 trawl doors. Tow duration was typically 20 minutes for Eul-S and 5 minutes for Eul-N. The standard hours of fishing were 0800 to 1700 hours, depending on sunrise and sunset in winter months. These surveys follow a random block design in a targeted depth range of 80 – 200 meters for the Eul-S and 80-300 meters for Eul-N. Set-level information includes the date, time, location, and depth that fishing took place, as well as information that can be used to calculate fishing effort (duration) and swept area. All successful fishing events are included, regardless of what was caught. Catches are identified to species or to the lowest taxonomic level possible. Most catches are weighed, but some are too small (“trace” amounts) or too large (e.g. very large Big Skate). This record contains Eulachon biological data including length, sex, and weight. Information is provided on whether stomachs or teeth were examined, and whether genetics (DNA) samples were collected.
Eulachon maturity data, diet data, and teeth presence data are available on request from the data contacts. Additional analyses are ongoing, including histology, fatty acid profiling, and genetic analysis; frozen heads are also available for a future aging project. In addition to the Eulachon biological data, lengths and weights were collected from American Shad.

Quality Control

Data are input while at sea using the in-house developed application GFBioField. Rigorous error checks and warnings are applied and edits take place during sampling in most cases. Further quality assurance checks are applied before loading to the database. Scientific names associated with resource occurrence records have been mapped to recognized standards - marine taxa have been mapped to the World Register of Marine Species (WoRMS). The WoRMS codes, the AphiaIDs have been included as LSIDs in the occurrence record DwC field scientificNameID.

Method steps

  1. Source data was obtained, with permission, from Open Canada and Excel was used to construct an Event Core, Occurrence Core and Extended Measurement or Fact extensions. Taxon matches were obtained from WoRMS

Taxonomic Coverages

  1. Aequorea victoria
    rank: species
  2. Allocentrotus fragilis
    rank: species
  3. Allosmerus elongatus
    rank: species
  4. Alosa sapidissima
    rank: species
  5. Ammodytes personatus
    rank: species
  6. Anoplopoma fimbria
    rank: species
  7. Apostichopus californicus
    rank: species
  8. Apostichopus leukothele
    rank: species
  9. Apristurus brunneus
    rank: species
  10. Artedius harringtoni
    rank: species
  11. Atheresthes stomias
    rank: species
  12. Aurelia aurita
    rank: species
  13. Balticina septentrionalis
    rank: species
  14. Bathyagonus nigripinnis
    rank: species
  15. Bathyraja interrupta
    rank: species
  16. Benthoctopus leioderma
    rank: species
  17. Beringraja binoculata
    rank: species
  18. Berryteuthis magister
    rank: species
  19. Brisaster latifrons
    rank: species
  20. Brosmophycis marginata
    rank: species
  21. Calliostoma annulatum
    rank: species
  22. Cancer productus
    rank: species
  23. Careproctus gilberti
    rank: species
  24. Ceramaster patagonicus
    rank: species
  25. Chilara taylori
    rank: species
  26. Chionoecetes bairdi
    rank: species
  27. Chitonotus pugetensis
    rank: species
  28. Chorilia longipes
    rank: species
  29. Citharichthys sordidus
    rank: species
  30. Clupea pallasii
    rank: species
  31. Crangon alaskensis
    rank: species
  32. Crossaster papposus
    rank: species
  33. Cryptacanthodes aleutensis
    rank: species
  34. Ctenodiscus crispatus
    rank: species
  35. Cyanea capillata
    rank: species
  36. Cyclosalpa affinis
    rank: species
  37. Cymatogaster aggregata
    rank: species
  38. Dasycottus setiger
    rank: species
  39. Dermasterias imbricata
    rank: species
  40. Doryteuthis opalescens
    rank: species
  41. Engraulis mordax
    rank: species
  42. Enteroctopus dofleini
    rank: species
  43. Entosphenus tridentatus
    rank: species
  44. Eopsetta jordani
    rank: species
  45. Eualus barbatus
    rank: species
  46. Eualus macropthalmus
    rank: species
  47. Eualus suckleyi
    rank: species
  48. Gadus chalcogrammus
    rank: species
  49. Gadus macrocephalus
    rank: species
  50. Gasterosteus aculeatus
    rank: species
  51. Gephyreaster swifti
    rank: species
  52. Glyptocephalus zachirus
    rank: species
  53. Gorgonocephalus eucnemis
    rank: species
  54. Hapalogaster mertensii
    rank: species
  55. Hemilepidotus hemilepidotus
    rank: species
  56. Henricia spiculifera
    rank: species
  57. Hexanchus griseus
    rank: species
  58. Hippasteria spinosa
    rank: species
  59. Hippoglossoides elassodon
    rank: species
  60. Hippoglossus stenolepis
    rank: species
  61. Hydrolagus colliei
    rank: species
  62. Icelinus filamentosus
    rank: species
  63. Icelinus tenuis
    rank: species
  64. Isopsetta isolepis
    rank: species
  65. Lebbeus grandimana
    rank: species
  66. Lebbeus groenlandicus
    rank: species
  67. Lepidopsetta bilineata
    rank: species
  68. Leptoclinus maculatus
    rank: species
  69. Leptocottus armatus
    rank: species
  70. Leuroglossus schmidti
    rank: species
  71. Liparis dennyi
    rank: species
  72. Liparis pulchellus
    rank: species
  73. Liparis rutteri
    rank: species
  74. Lopholithodes foraminatus
    rank: species
  75. Luidia foliolata
    rank: species
  76. Lumpenella longirostris
    rank: species
  77. Lumpenus sagitta
    rank: species
  78. Lycodapus mandibularis
    rank: species
  79. Lycodes brevipes
    rank: species
  80. Lycodes diapterus
    rank: species
  81. Lycodes pacificus
    rank: species
  82. Lycodes palearis
    rank: species
  83. Lyopsetta exilis
    rank: species
  84. Malacocottus kincaidi
    rank: species
  85. Malacocottus zonurus
    rank: species
  86. Mediaster aequalis
    rank: species
  87. Merluccius productus
    rank: species
  88. Mesocentrotus franciscanus
    rank: species
  89. Metacarcinus magister
    rank: species
  90. Microgadus proximus
    rank: species
  91. Microstomus pacificus
    rank: species
  92. Molpadia intermedia
    rank: species
  93. Munida quadrispina
    rank: species
  94. Nectoliparis pelagicus
    rank: species
  95. Neocrangon communis
    rank: species
  96. Oncorhynchus kisutch
    rank: species
  97. Oncorhynchus tshawytscha
    rank: species
  98. Ophiodon elongatus
    rank: species
  99. Orthasterias koehleri
    rank: species
  100. Pandalopsis dispar
    rank: species
  101. Pandalus borealis
    rank: species
  102. Pandalus danae
    rank: species
  103. Pandalus hypsinotus
    rank: species
  104. Pandalus jordani
    rank: species
  105. Pandalus platyceros
    rank: species
  106. Pandalus stenolepis
    rank: species
  107. Pandalus tridens
    rank: species
  108. Paracrangon echinata
    rank: species
  109. Paraliparis deani
    rank: species
  110. Parophrys vetulus
    rank: species
  111. Pasiphaea pacifica
    rank: species
  112. Phacellophora camtschatica
    rank: species
  113. Phoca vitulina
    rank: species
  114. Pisaster brevispinus
    rank: species
  115. Platichthys stellatus
    rank: species
  116. Podothecus accipenserinus
    rank: species
  117. Porichthys notatus
    rank: species
  118. Poroclinus rothrocki
    rank: species
  119. Psolus chitonoides
    rank: species
  120. Psychrolutes paradoxus
    rank: species
  121. Pteraster tesselatus
    rank: species
  122. Ptilosarcus gurneyi
    rank: species
  123. Pugettia gracilis
    rank: species
  124. Pycnopodia helianthoides
    rank: species
  125. Radulinus asprellus
    rank: species
  126. Raja rhina
    rank: species
  127. Ronquilus jordani
    rank: species
  128. Rossia pacifica
    rank: species
  129. Sebastes alutus
    rank: species
  130. Sebastes babcocki
    rank: species
  131. Sebastes brevispinis
    rank: species
  132. Sebastes caurinus
    rank: species
  133. Sebastes crameri
    rank: species
  134. Sebastes diploproa
    rank: species
  135. Sebastes elongatus
    rank: species
  136. Sebastes flavidus
    rank: species
  137. Sebastes maliger
    rank: species
  138. Sebastes miniatus
    rank: species
  139. Sebastes paucispinis
    rank: species
  140. Sebastes pinniger
    rank: species
  141. Sebastes proriger
    rank: species
  142. Sebastes ruberrimus
    rank: species
  143. Sebastes zacentrus
    rank: species
  144. Sebastolobus alascanus
    rank: species
  145. Sergestes similis
    rank: species
  146. Solaster stimpsoni
    rank: species
  147. Spirontocaris holmesi
    rank: species
  148. Spirontocaris lamellicornis
    rank: species
  149. Squalus suckleyi
    rank: species
  150. Strongylocentrotus droebachiensis
    rank: species
  151. Strongylocentrotus pallidus
    rank: species
  152. Strongylocentrotus purpuratus
    rank: species
  153. Stylasterias forreri
    rank: species
  154. Thaleichthys pacificus
    rank: species
  155. Tritonia diomedea
    rank: species
  156. Xeneretmus latifrons
    rank: species
  157. Zaprora silenus
    rank: species
  1. Actiniaria
    rank: order
  2. Antedonidae
    rank: family
  3. Aphrodita
    rank: genus
  4. Asteroidea
    rank: class
  5. Bivalvia
    rank: class
  6. Brachiopoda
    rank: phylum
  7. Buccinidae
    rank: family
  8. Calliostomatidae
    rank: family
  9. Cottidae
    rank: family
  10. Crangonidae
    rank: family
  11. Ctenophora
    rank: phylum
  12. Decapoda
    rank: order
  13. Dendrobranchiata
    rank: suborder
  14. Dorididae
    rank: family
  15. Eualus
    rank: genus
  16. Euphausia
    rank: genus
  17. Euphausiacea
    rank: order
  18. Fusitriton
    rank: genus
  19. Gasterosteidae
    rank: family
  20. Gastropoda
    rank: class
  21. Holothuroidea
    rank: class
  22. Isopoda
    rank: order
  23. Liparidae
    rank: family
  24. Mediaster
    rank: genus
  25. Molpadia
    rank: genus
  26. Myctophidae
    rank: family
  27. Mytilidae
    rank: family
  28. Nereididae
    rank: family
  29. Octopoda
    rank: order
  30. Octopodidae
    rank: family
  31. Ophiuroidea
    rank: class
  32. Oregonia
    rank: genus
  33. Orthasterias
    rank: genus
  34. Osmeridae
    rank: family
  35. Paguroidea
    rank: superfamily
  36. Pectinidae
    rank: family
  37. Pholidae
    rank: family
  38. Pisaster
    rank: genus
  39. Pleuronectiformes
    rank: order
  40. Polynoe
    rank: genus
  41. Porifera
    rank: phylum
  42. Primnoa
    rank: genus
  43. Pugettia
    rank: genus
  44. Pyrosoma
    rank: genus
  45. Rajidae
    rank: family
  46. Salpidae
    rank: family
  47. Scyphozoa
    rank: class
  48. Sebastes
    rank: genus
  49. Sipuncula
    rank: phylum
  50. Solaster
    rank: genus
  51. Stichaeidae
    rank: family
  52. Strongylocentrotus
    rank: genus
  53. Tarletonbeania
    rank: genus
  54. Tunicata
    rank: phylum
  55. Turbinidae
    rank: family

Geographic Coverages

EUL-S covered portions of the Strait of Georgia and Juan de Fuca Strait in Pacific Fishery Management areas (PFMA’s) 17-20, 28, 29, and 121.
Eul-N consists of seven trips conducted mainly in Chatham Sound with sets in Hecate Strait, and Portland Inlet (Pacific Fishery Management areas (PFMA’s) 3, 4, and 104).

Bibliographic Citations

Contacts

Melissa Nottingham
originator
position: OBIS Data Biologist
Fisheries and Oceans Canada
3190 Hammond Bay Road
Duncan
V9T 6N7
BC
CA
email: melissa.nottingham@dfo-mpo.gc.ca
Vanessa Hodes
metadata author
position: Biologist
Fisheries and Oceans Canada
3190 Hammond Bay Road
Nanaimo
V9T 6N7
BC
CA
email: Vanessa.Hodes@dfo-mpo.gc.ca
OBIS Canada node manager
administrative point of contact
position: OBIS Canada node manager
Fisheries and Oceans Canada
3190 Hammond Bay Road
Nanaimo
V9T 6N7
BC
CA
email: OBISCanada@dfo-mpo.gc.ca
Vanessa Hodes
administrative point of contact
position: Biologist
Fisheries and Oceans Canada
3190 Hammond Bay Road
Nanaimo
V9T 6N7
BC
CA
email: Vanessa.Hodes@dfo-mpo.gc.ca
Lindsay Dealy
administrative point of contact
position: Biologist
Fisheries and Oceans Canada
3190 Hammond Bay Rd
Nanaimo
BC
CA
email: lindsay.dealy@dfo-mpo.gc.ca
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