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            <gco:CharacterString>This data is from the Newfoundland and Labrador Region Multispecies Trawl survey, specific to Snow Crab from 2018-25, with only successful tows included in the database. Details of annual survey coverage and an overview of the survey program can be found in Rideout et al. (2025) and references therein. This trawl survey follows a depth-stratified random design, designated by type = 1 (Survey).  


From 2021-23, a comparative fishing program (i.e., direct side-by-side paired comparison between old and new vessels) was undertaken to determine differences in catchability due to vessel changes and associated modifications to the trawl gear with the retirement of the CCGS Alfred Needler and CCGS Teleost (called ‘old vessels’) and the introduction of the CCGS Capt. Jacques Cartier and CCGS John Cabot (called ‘new vessels’). During this period other set types are in the dataset (6 and 7) from paired tows and all station allocation may not have been stratified random. 


The DFO NL Region comparative fishing success varied by year, NAFO division, and vessel combinations and resulted in conversion factors to adjust the catches of Snow Crab in the old vessels time series into the same units as the new vessels. Methodologies and conversion factors are described in Wheeland et al. (2024), Trueman et al. (2025), Trueman et al. (2026), and Pantin et al. (in prep). 


Conversion factors have been applied to the numbers of Snow Crab caught, where conversion factors exist, and are in the converted_number column. An NA in the converted_number column indicates that conversion factors do not exist for this vessel/area combination and therefore direct comparisons cannot be made between old vessels and new vessels. Weights are those recorded at sea and do not have conversion factors applied. Analyses by the DFO NL Snow Crab group apply a length-weight relationship to the converted numbers to determine converted weights, which is not in this dataset. 


All reasonable attempts are made to standardize fishing time during trawl surveys, however there is always some variation in the actual time on bottom. The species weights and numbers in this dataset are not standardized for tow distance/duration. Spatial coverage of this survey has varied over time, therefore, not all divisions, or depths within divisions, are sampled every year or season. Biological measurements are described in Pantin et al. (2025). Tows that caught zero Snow Crab are denoted in the dataset by a ‘number’ of 0.


References:


McCallum, B. R., and S. J. Walsh. 1996. Groundfish survey trawls used at the Northwest Atlantic Fisheries Centre, 1971-present. NAFO Sci. Coun. Studies, 29: 93-104.


Pantin, J., D. Mullowney, K. Baker, K. Lefort, W. Coffey, F. Cyr, H. Munro, and Koen-Alonso, M. 2025. An Assessment of Newfoundland and Labrador Snow Crab (Chionoecetes opilio) in 2023. DFO. Can. Sci. Advis. Sec. Res. Doc. 2025/080. iv + 152 p.


Pantin, J., Charmley, K., Mullowney, D., Baker, K., Lefort, K., Coyne, J., Munro, H., and Koen-Alonso, M. In prep. An Assessment of Newfoundland and Labrador Snow Crab (Chionoecetes opilio) in 2024. DFO Can. Sci. Advis. Sec. Res. Doc. year/nnn.


Rideout, R.M., Wheeland, L., Perreault, A., Regular, P., Skanes, K., Simms, L., and Makrides, J. 2025. Canadian (Newfoundland and Labrador Region) Multi-Species Research vessel Bottom Trawl Survey Report for Surveys Conducted in 2024. NAFO SCR Doc. 25/028: 1-68.


Trueman, S., Wheeland, L., Benoît, H., Munro, H., Nguyen, T., Novaczek, E., Skanes, K., and Yin, Y. 2025. Results of Comparative Fishing Between the CCGS Teleost and CCGS Alfred Needler with the CCGS John Cabot and CCGS Capt. Jacques Cartier in the Newfoundland and Labrador Region in 2021 and 2022. DFO Can. Sci. Advis. Sec. Res. Doc. 2025/021. v + 237 p. 


Trueman, S., Wheeland, L., Pantin, J., Baker, K., and Mullowney, D. 2026. On the relative catchability of Snow Crab in the Newfoundland and Labrador Multispecies trawl surveys. DFO Can. Sci. Advis. Sec. Res. Doc. 2026/008. iv + 41 p. 


Wheeland, L., Skanes, K. and Trueman, S. 2024. Summary of Comparative Fishing Data Collected in Newfoundland &amp; Labrador from 2021-2022. Can. Tech. Rep. Fish. Aquat. Sci. 3579: iv + 132 p.</gco:CharacterString>
            <gmd:PT_FreeText>
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                  <gmd:LocalisedCharacterString locale="#fra">Ces données proviennent du relevé multispécifique au chalut de la région de Terre Neuve et Labrador, et concernent spécifiquement le crabe des neiges pour la période 2018 2025; seuls les traits de chalut réussis sont inclus dans la base de données. Les détails sur la couverture annuelle du relevé ainsi qu’un aperçu du programme de relevé sont présentés dans Rideout et al. (2025) et les références qui y sont citées. Ce relevé au chalut suit un plan d’échantillonnage aléatoire stratifié selon la profondeur, désigné par le type = 1 (Survey).


De 2021 à 2023, un programme de pêche comparative (c.-à-d. une comparaison directe appariée, côte à côte, entre les anciens et les nouveaux navires) a été mené afin de déterminer les différences de capturabilité attribuables aux changements de navires et aux modifications associées à l’engin de chalutage, à la suite du retrait du NGCC Alfred Needler et du NGCC Teleost (désignés comme les « anciens navires ») et de l’introduction du NGCC Capt. Jacques Cartier et du NGCC John Cabot (désignés comme les « nouveaux navires »). Au cours de cette période, d’autres types de traits (6 et 7) sont inclus dans l’ensemble de données, provenant des traits appariés, et l’allocation des stations peut ne pas avoir suivi un plan strictement aléatoire stratifié.


Le succès du programme de pêche comparative dans la région de Terre Neuve et Labrador du MPO variait selon l’année, la division de l’OPANO (NAFO) et les combinaisons de navires, et a mené à l’élaboration de facteurs de conversion visant à ajuster les captures de crabe des neiges de la série chronologique des anciens navires afin de les exprimer dans les mêmes unités que celles des nouveaux navires. Les méthodologies et les facteurs de conversion sont décrits dans Wheeland et al. (2024), Trueman et al. (2025), Trueman et al. (2026) et Pantin et al. (en préparation).


Les facteurs de conversion ont été appliqués aux nombres de crabes des neiges capturés, là où de tels facteurs existent, et sont consignés dans la colonne nombre_converti. Une valeur NA dans la colonne nombre_converti indique qu’aucun facteur de conversion n’existe pour cette combinaison navire/zone et que, par conséquent, des comparaisons directes ne peuvent pas être effectuées entre les anciens et les nouveaux navires. Les poids correspondent à ceux mesurés en mer et aucun facteur de conversion ne leur a été appliqué. Les analyses réalisées par le groupe du crabe des neiges du MPO de Terre Neuve et Labrador appliquent une relation longueur poids aux nombres convertis afin de déterminer des poids convertis, lesquels ne sont pas inclus dans cet ensemble de données.


Tous les efforts raisonnables sont déployés afin de standardiser la durée de pêche lors des relevés au chalut; toutefois, une certaine variabilité persiste toujours dans le temps réel passé au fond. Les poids et les nombres par espèce figurant dans cet ensemble de données ne sont pas standardisés en fonction de la distance ou de la durée des traits. La couverture spatiale de ce relevé a varié au fil du temps; par conséquent, toutes les divisions, ou toutes les profondeurs à l’intérieur des divisions, ne sont pas échantillonnées chaque année ou chaque saison. Les mesures biologiques sont décrites dans Pantin et al. (2025). Les traits de chalut n’ayant capturé aucun crabe des neiges sont indiqués dans l’ensemble de données par un « nombre » égal à 0.


Références:


McCallum, B. R. et Walsh, S. J. 1996. Chaluts de relevé des poissons de fond utilisés au Centre des pêches de l’Atlantique Nord Ouest, 1971 à aujourd’hui. Études du Conseil scientifique de l’OPANO, 29 : 93 104.
Version française non disponible (publication OPANO uniquement en anglais).


Pantin, J., Mullowney, D., Baker, K., Lefort, K., Coffey, W., Cyr, F., Munro, H. et Koen Alonso, M. 2025. Évaluation du crabe des neiges (Chionoecetes opilio) à Terre Neuve et Labrador en 2023. Secrétariat canadien des avis scientifiques du MPO. Document de recherche 2025/080, vi + 161 p.


Pantin, J., Charmley, K., Mullowney, D., Baker, K., Lefort, K., Coyne, J., Munro, H. et Koen Alonso, M. En préparation. Évaluation du crabe des neiges (Chionoecetes opilio) à Terre Neuve et Labrador en 2024. Secrétariat canadien des avis scientifiques du MPO. Document de recherche année/nnn.
Version française à paraître.


Rideout, R. M., Wheeland, L., Perreault, A., Regular, P., Skanes, K., Simms, L. et Makrides, J. 2025. Rapport du relevé plurispécifique au chalut de fond effectué en 2024 par navire de recherche canadien (région de Terre Neuve et Labrador). Document du Conseil scientifique de l’OPANO 25/028 : 1 68.
Version française non disponible (document OPANO).


Trueman, S., Wheeland, L., Benoît, H., Munro, H., Nguyen, T., Novaczek, E., Skanes, K. et Yin, Y. 2025. Résultats de la pêche comparative du NGCC Teleost et du NGCC Alfred Needler par rapport au NGCC John Cabot et au NGCC Capt. Jacques Cartier dans la région de Terre Neuve et Labrador en 2021 et 2022. Secrétariat canadien des avis scientifiques du MPO. Document de recherche 2025/021, v + 241 p.


Trueman, S., Wheeland, L., Pantin, J., Baker, K. et Mullowney, D. 2026. Capturabilité relative du crabe des neiges dans les relevés plurispécifiques au chalut à Terre Neuve et Labrador. Secrétariat canadien des avis scientifiques du MPO. Document de recherche 2026/008, iv + 43 p.


Wheeland, L., Skanes, K. et Trueman, S. 2024. Résumé des données de pêche comparative recueillies à Terre Neuve et Labrador en 2021 et 2022. Rapport technique canadien des sciences halieutiques et aquatiques 3579, iv + 132 p.</gmd:LocalisedCharacterString>
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