Sentinel Surveys 1995-2020 – Catch rates and biological information on Atlantic Cod (Gadus morhua) in NAFO Divisions 2J3KL
Notice bibliographique
Résumé
Catch rates and biological information of Atlantic Cod from the Sentinel survey program in Northwest Atlantic Fisheries Organization (NAFO) Divisions (Divs.) 2J3KL are updated for 2018. Temporal trends in gillnet (3¼ and 5½ inch mesh) and linetrawl unstandardized catch rates were initially similar for all gears, with relatively high values at the beginning of each time-series, followed by sharp declines in the late-1990s, early-2000s. Catch rates for small mesh gillnet and linetrawl oscillated around or below the historical mean catch rate thereafter, and increased for large mesh gillnet until 2014–15. Catch rates for all gears declined since then. Mean catch rate for small mesh gillnet was consistently higher than that of large mesh gillnet for most of the time-series. Standardized age-disaggregated catch rate for large mesh gillnet in the Northern area was stable at low levels in 1995–2004 (mostly ≤6 year-old fish), then increased rapidly and peaked in 2015 before declining over 2016–17. The contribution of ≥7 year-old fish increased considerably since 2012. Catch rates in the Central area were higher at the beginning of the time-series (mostly 6–8 year-old fish), declined rapidly to their lowest values in 2002, and then followed a pattern similar to that of the Northern area. Catch rates in the Southern area declined rapidly over 1998–2002, then remained stable at low levels. Catch rates for small mesh gillnet in Northern and Central areas indicated patterns similar to those of large mesh size gillnet. In the Southern area, catch rates declined until 2014, then increased by several folds over 2015–16. Temporal trend for linetrawl (Central area) was also similar to those of gillnets in Northern and Central areas (mostly 3–8 year-old fish). Three to five year-old fish were well-represented in 1995–2008, but declined thereafter. Age-aggregated catch rates showed patterns similar to those of age-disaggregated estimates in all cases. Large mesh gillnet and linetrawl captured larger fish from specific size ranges; whereas the small mesh gillnet retaining small and large fish from multiple length-classes. Indices of physiological condition for both males and females cod (Fulton’s condition factor, Hepatosomatic Index, and Gonadosomatic Index) varied seasonally and annually. Total removals (control plus experimental sites, all gears combined) of Atlantic Cod caught in Divs. 2J3KL Sentinel surveys (1995–2017) peaked at 388 t in 1998, declined to 92 t in 2003, reached 270 t annually over 2012–15, and then declined to 173 t in 2017. Several fish species were recorded as Sentinel bycatch in 1995–2017: American Plaice and Winter Flounder were the most common in large mesh gillnet.
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 | 0,001 | 0,001 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,001 | 0,001 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| 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 ».