Summary of 2015, 2016, and 2017 Herring Acoustic Surveys in Northwest Atlantic Fisheries Organization (NAFO) Divisions 4VWX
Notice bibliographique
Résumé
Automated acoustic recording systems deployed on commercial fishing vessels have been used since 1997 to document the distribution and relative abundance of Atlantic Herring from industry vessel surveys and fishing excursions in the Bay of Fundy and coastal Nova Scotia area within Northwest Atlantic Fisheries Organization (NAFO) divisions 4VWX. During the years 2015 to 2017, regularly scheduled surveys at approximately 14 day intervals were again conducted on the main Herring spawning components, and the spawning stock biomass for each component was estimated by summing these results. Six structured surveys were conducted in Scots Bay in 2015, six in 2016, and eight in 2017. Five usable structured surveys were conducted on German Bank in both 2015 and 2016. There were four (plus two) surveys on German Bank in 2017. The September 17 survey was initially excluded because it was nine days after the previous one; however, this resulted in a 28-day gap before the next acceptable survey. Subesquently, at the 2018 assessment meeting, this survey was included. One acceptable structured survey was completed in the Trinity Ledge area in 2015, followed by three in 2016 and four in 2017. There were no structured surveys conducted in 2015 or 2016 for Spectacle Buoy; however, three fall surveys were completed in 2017. In most cases, these surveys provided good coverage of the spawning areas consistent with established protocols. In 2015, the biomass estimate decreased to approximately 4% of the 2014 estimate for the combined survey areas of Scots Bay, Trinity Ledge, and German Bank (known as the Southwest Nova Scotia/Bay of Fundy [SWNS/BoF] [4X] stock). The 2016 estimate for the same overall areas decreased 29% of the 2015 estimate, while in 2017 the biomass increased (20%) above the 2016 estimate. The 2014 and 2015 estimates were above the long-term average since 1999, while the 2016 and 2017 biomass estimates are below the long-term average. These estimates provide mixed indications with regards to the SWNS/BoF stock. The German Bank spawning biomass estimate has decreased at an average annual rate of 9% since 2011. The Trinity Ledge 2017 spawning biomass has increased substantially to be above the long-term average; however, since 2006, the estimates have been well below the average. The recent large fluctuation in the SWNS/BoF spawning complex is occurring in the Scots Bay area; however, the long-term trend is upward. Biomass estimates from surveys of the coastal Nova Scotia spawning components for the Little Hope/Port Mouton, Halifax/Eastern Shore, and Glace Bay areas were also examined. Four (2013), six (2014), and six (2017) surveys were completed for Little Hope, as well as, four (2015), seven (2016), and 10 (2017) surveys for Halifax/Eastern Shore. No surveys were completed in the Glace Bay area. In Little Hope, a substantial increase in the spawning biomass estimate to a historic high was observed in 2015 (145,395 t), a three-fold increase over the 2014 estimate. There was a 57% decrease in the estimate in 2016 (61,408 t) followed by an 8% increase in 2017 to 66,815 t. The estimate is above the long-term average of 38,659 t. The total spawning biomass estimate for the Halifax/Eastern Shore area demonstrated a seven-fold increase from 9.586 t (2014) to 68,564 t (2015). While the biomass decreased to 54,352 t (2015) and 58,681 t (2017), it is above the recent five-year average of 39,602 t, and above the long-term average since 1998 (33,606 t). No survey was completed in Glace Bay during the 2015–2017 period.
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 | 0,002 | 0,003 |
| Méta-épidémiologie (sens strict) | 0,001 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,004 | 0,003 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,001 | 0,000 |
| Science ouverte | 0,000 | 0,001 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,008 | 0,003 |
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 ».