Allis shad Ex situ Stock in Aquarium La Rochelle - Rearing results and sexual maturation
Bibliographic record
Abstract
The final objective of this action is to reduce the amount of adults collected for larvae production. In the framework of this action, a batch of allis shad larvae was reared in Aquarium La Rochelle facilities to test the feasibility and to follow the sexual maturation process. Mortality was high during the first 4 months, and the survival rate was stabilized at 22%. At the end of the experiment survival was 12%. From 1 month old larvae, the feeding sequence was made of artificial feed and frozen zooplankton.\nAfter a 4 year rearing, mean total length was 35 ± 1 cm, and mean weight was 387 ± 34 g. Two main pathologies were observed: mouth malformation during the first weeks of rearing and renal nodules in 3 years old fish. In June 2015 the first mature fish were observed (males). The first allis shad ex situ rearing from larvae until 4 years old fish has been realized in Aquarium La Rochelle. Some recommendations are listed. / Dans l'optique de minimiser les prélèvements de géniteurs pour réaliser des productions de larves destinées au repeuplement, une action C1 Ex situ stock a été développée dans le cadre du projet Life+ Alosa alosa.\nDans le cadre de cette action un lot de larves a été élevé pendant 4 ans à l'Aquarium La Rochelle, pour déterminer les particularités de cet élevage et le suivi de la maturation sexuelle. La mortalité a été très forte durant les 4 premiers mois. Le taux de survie s'est stabilisé à 22%. Il est de 12% à la fin des 4 ans d'élevage. A partir de l'âge de 1 mois, la séquence alimentaire a été composée d'un aliment artificiel et de zooplancton congelé. A la fin de l'élevage, les poissons avaient une longueur totale moyenne de 35 ± 1 cm, pour un poids moyen de 387 ± 34 g. Les principales pathologies observées ont concernées les déformations de la bouche et des nodules rénaux sur des poissons de 3 ans.\nEn juin 2015 les premiers individus matures ont été observés (mâles fluents). Ce travail a permis de réaliser le premier élevage ex situ de grande alose, depuis le stade larvaire et jusqu'à l'âge de 4 ans. Des recommandations sont proposées à partir de cette première expérience.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.007 | 0.002 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".