Demersal Juvenile Atlantic Cod (Gadus morhua) Survey of the Northeast Coast of Newfoundland : 2020 Fleming Survey
Notice bibliographique
Résumé
A survey of demersal juvenile Atlantic cod (Gadus morhua) was conducted along the Northeast Coast of Newfoundland in nearshore waters (<10 m deep) from 1959–64 by Government of Canada Departments (now represented by the Department of Fisheries and Oceans [DFO]). This survey (which became known as the Fleming survey, after originator Alistair Fleming) aimed to characterize the distribution and abundance of juvenile Atlantic cod and was based upon Norway’s Flødevigen sampling program which has been conducted continuously since 1919. A 25 m seine was used to sample juvenile Atlantic cod nursery locations on the Avalon Peninsula and Northeast Coast of Newfoundland in September and October. The survey was discontinued in 1964 but was reinstated by Memorial University of Newfoundland from 1992–97. Multiple tows were conducted at a subset of the original 55 Fleming sites located in St. Mary’s Bay, Trepassey Bay, the Southern Shore, Conception Bay, Trinity Bay, Bonavista Bay, Gander Bay, New World Island, Fortune Harbour, Badger Bay, Halls Bay and Green Bay. A full version of the survey (40 sites) was executed in 2001 and select sites were surveyed in 2017 and 2018. The Fleming survey program was reestablished by DFO in 2020. A total of 42 of the modern subset of 45 sites were visited resulting in 40 sites being sampled successfully in 2020. Direct comparison of Atlantic cod catch (count, lengths and rate) is possible across the time series because of consistency with survey methods. The primary objective was to collect data to determine abundance of age 0-, 1-, and 2- group cod to compare with previous surveys and reestablish a network of inshore harvesters (active and retired) to participate in the survey. A total of 665 juvenile cod (615 0-group; 47 1-group, 3 2-group) were collected at 40 sites between St. Mary’s Bay and western Notre Dame Bay. The catch of 0-group cod dominates the overall catch (mean=15.38 cod/tow). In general, the mean juvenile cod catch for each group is similar to the mean catches from the 1990s and latter part of the 1959–64 time series. During the 2020 survey, only one tow was made per site to measure juvenile cod density due to logistical constraints. In earlier Fleming survey programs, multiple tows were conducted (minimum two) at a survey site in an attempt to develop a density index. In 2020, the average catch rate for 0-, 1-, and 2-groups was 15.38, 1.18, and 0.08 cod per haul respectively. These rates are generally consistent with the average cod per tow (first tow only) reported from the Fleming survey in the post collapse era (1992–97, and 2001): 13.35, 5.90, and 0.56 cod per tow for 0-, 1- and 2- groups. Densities of juvenile cod have not recovered since the stock collapse in the early-1990s, despite some improvements in adult population size.
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 | 0,001 | 0,000 |
| Communication savante | 0,001 | 0,000 |
| Science ouverte | 0,001 | 0,001 |
| 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 ».