Development of a Monitoring Framework for the Potential Establishment of a Commercial Whelk Fishery in the Maritimes Region (4VS, 4W)
Notice bibliographique
Résumé
Whelk fishing has a long history throughout the range of the species. In the Fisheries and Oceans Canada (DFO) Maritimes Region, an offshore exploratory whelk fishery commenced within North Atlantic Fisheries Organization (NAFO) divisions 4W and 4Vs during 2012. To date, license holders have found several areas that have yielded high landings of whelk. In 4Vs, landings have been strong with continual growth as larger areas are explored and the Total Allowable Catch (TAC) increased. Landings have reached as high as 665 tonnes in 2018, with an average Catch Per Unit Effort (CPUE) from 2009 to 2019 of 14.9 kg/trap. In 4W, a single area yielding high landings of whelk has been identified recently with landings as high as 211 tonnes. The CPUE in this division is lower than that of 4Vs, with a mean CPUE from 2012 to 2019 of 3.5 kg/trap. Fisheries Management has requested advice from DFO Science to assess current metrics gathered by the license holders, as well as establish priority areas for research and analysis that will enable development of a stock assessment framework for offshore whelk. Developing an assessment of stock status is currently hampered by limited information with regards to natural abundance of whelk within fished areas and the spatial extent and variation of whelk populations. Currently, there are no independent surveys that adequately sample whelk. Information on whelk is based solely on data collected by the exploratory license holders, who are currently collecting a host of useful biological data. Metrics such as age- and size-at maturity could be refined through alteration of the methods used and through defining the timing of the reproductive cycles. Most importantly, though, is the need to identify population structure. This species exhibits a low dispersal potential due to its direct development in benthic egg capsules and low adult movement. This results in local adaptation and potential genetic differences at small spatial scales. Whelk are vulnerable to local depletion due to these factors and their management should be applied to biologically relevant management units such as subpopulations. Management can be informed by many of the metrics currently collected by industry, and identifying population structure has been prioritized in the research plans of the license holders. Further work to identify the spatial extent of various subpopulations should be prioritized to establish these management units and to determine appropriate management strategies (such as Minimum Legal Size [MLS] informed by the life-history traits of the respective subpopulations).
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,009 | 0,012 |
| Méta-épidémiologie (sens strict) | 0,001 | 0,000 |
| Méta-épidémiologie (sens large) | 0,001 | 0,001 |
| Bibliométrie | 0,008 | 0,003 |
| Études des sciences et des technologies | 0,001 | 0,001 |
| Communication savante | 0,003 | 0,004 |
| Science ouverte | 0,003 | 0,005 |
| Intégrité de la recherche | 0,001 | 0,001 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,002 | 0,001 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule source (Gemma direct ou Codex distillé), pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».