The ICES Working Group on Southern horse mackerel, anchovy and sardine (WGHANSA) assessed the stock status and provided a draft catch advice for anchovy in Atlantic Iberian waters (ane.27.9a; western and southern components) and horse mackerel in Atlantic Iberian waters (hom.27.9a) in the May meeting. However, anchovy in Division 9a was split in two different stocks during the benchmark in September 2024. The advice for the stock in the Gulf of C [...]
Defining end-to-end (or online) training schemes for the calibration of neural sub-models in hybrid systems requires working with an optimization problem that involves the solver of the physical equations. Online learning methodologies thus require the numerical model to be differentiable, which is not the case for most modeling systems. To overcome this, we present an efficient and practical online learning approach for hybrid systems. The metho [...]
We show that analyzing archived and future multibeam backscatter and bathymetry data, in tandem with regional environmental parameters, can help to identify polymetallic nodule fields in the world’s oceans. Extensive archived multibeam transit data through remote areas of the world’s oceans are available for data mining. New multibeam data will be made available through the Seabed 2030 Project. Uniformity of along- and across-track backscatter, b [...]
Les ressources halieutiques sont indispensables pour l’alimentation humaine et forment un maillon essentiel des écosystèmes marins. Sa gestion est réalisée en évaluant des unités de gestion appelées « stocks halieutiques ». Ces stocks sont souvent identifiés par la forme externe de l’otolithe, une pièce calcifiée présente dans l’oreille interne des poissons. En effet, sa forme varie selon l’héritage génétique, l’adaptation à l’environnement et l’ [...]
La campagne scientifique NURSE est un dispositif du sous-programme de surveillance du descripteur 1 « Biodiversité – Poissons et céphalopodes ». Elle permet d'acquérir des données en vue du calcul des indicateurs nécessaires au renseignement des critères du bon état écologique pour le D1 (Décision 2017/848/UE). Cette campagne contribue également à la compréhension du fonctionnement des écosystèmes côtiers, au niveau régional (échelle d’une baie o [...]
Fishing gears are designed to catch marine species, but when lost at sea, they can continue to trap and kill aquatic life, a phenomenon known as ghost fishing. This study evaluated the use of a biodegradable twine made from poly(butylene succinate)/poly(butylene adipate terephthalate) (PBS/PBAT) in trawl fishing. The assessment included mechanical testing, trawl modelling, and seawater ageing simulations to explore potential loss scenarios. Mecha [...]
Sustainability in fisheries hinges upon a multifaceted approach. It entails an ongoing assessment of fisheries' sustainability across ecological, social, and economic dimensions. This necessitates a comprehensive understanding of the trade-offs inherent in pursuing these diverse goals. Within the Indian Ocean, tuna fisheries management faces challenges due to unsustainable exploitation, uneven access to catch opportunities, and increasing stakeho [...]
The true state of ocean biodiversity is difficult to assess, and there are few global indicators to track the primary threat of overfishing. We calculated a 50-year Red List Index of extinction risk and ecological function for 1199 sharks and rays and found that since 1970, overfishing has halved their populations and their Red List Index has worsened by 19%. Overfishing the largest species in nearshore and pelagic habitats risks loss of ecomorph [...]
This document applies to the product INSITU_GLO_BGC_CARBON_DISCRETE_MY_013_050: the community data products SOCAT (Surface Ocean CO2 ATlas) and GLODAP (Global Ocean Data Analysis Project), which contain inorganic carbon observations and auxiliary variables, and their gridded fields at different spatial-temporal resolutions
Embryogenesis is a brief but potentially critical phase in the life cycle of a tree for adaptive phenotypic plasticity. Using somatic embryogenesis in maritime pine (Pinus pinaster Ait.), we found that temperature during the maturation phase affects embryo development and postembryonic tree growth for up to 3 yr. We examined whether this somatic stress memory could stem from temperature- and/or development-induced changes in DNA methylation. For [...]
Cette procédure a pour objet de décrire la stratégie d’échantillonnage des lieux de surveillance du REPHY Sanitaire et REPHYTOX dans la région Occitanie en 2025. Les logigrammes, présentés par secteur géographique, indiquent la logique opérationnelle à suivre entre les lieux de surveillance du REPHY et du REPHYTOX dans le cadre de la mise en oeuvre des stratégies de ces réseaux. Ces stratégies sont détaillées dans le document de procédure nationa [...]
The ICES Scallop Assessment Working Group (WGScallop) collates, reviews and analyses scal-lop landings data, scallop surveys and methods, scallop ageing procedures and advances in tech-nology to further develop and improve appropriate stock assessment methods. Data from the fifth year of the WGScallop data call were collated and compared with an extrac-tion from the Regional Database Estimation System (RDBES) for the second year. A comparison of [...]
Rotational harvesting of marine areas is a spatial fisheries management tool that aims to improve fishing sustainability (e.g., protect fishing resources whereas maintaining fishing yields). It consists of dividing fishing grounds into areas that are alternatively closed for a period. In November 2016, a marine rotational harvest area was implemented in the Bay of Seine (English Channel, French coast), one of the main king scallops (Pecten maximu [...]
Due to the increasing demand for precise mapping, surveying, geodesy, and large-scale infrastructure projects, the establishment of a precise national geoid model for Nigeria is essential. In this doctoral thesis, an experimental gravimetric geoid model customized for Nigeria has been developed. This model integrates various data sources, including terrestrial gravity data, shipborne gravity measurements, satellite altimetry-derived gravity data, [...]
Le présent rapport présente les résultats de la surveillance de ce paramètre pour l’année 2022 en appliquant la méthodologie mise au point précédemment et modifiée par l’exclusion des gracilaires.
Il s'agit du rapport annuel de Convention DGAMPA-Ifremer 2022 du programme d’observation des marées au débarquement (OBSDEB) du Système d'Informations Halieutiques (SIH). Il présente les estimations des efforts de pêche et des productions dans les régions La Réunion, Martinique, Mayotte, Guadeloupe et Guyane pour les navires de moins de 12 m. Ce programme contribue à l’estimation de l’effort de pêche et des captures des flottilles de petite pêch [...]
