Eulachon migration bottom trawl surveys

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

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