To improve our knowledge of the aggregation of species around anchored FADs in Mayotte, diving surveys are carried out every 3 months on 3 FADs. Various environmental parameters are also collected in order to establish links between them and aggregations. Important Note: This submission has been initially submitted to SEA scieNtific Open data Edition (SEANOE) publication service and received the recorded DOI. The metadata elements have been further processed (refined) in EMODnet Ingestion Service in order to conform with the Data Submission Service specifications.

The RESILIENCE experiment took place in April and May 2022 on the R/V Marion Dufresne in the Southwestern Indian Ocean, South of the Mozambique Chanel and offshore of Durban (South Africa). The main scientific objective was to study the interaction at fine scale (about 10km) between physics and biology. To do so CTD stations were performed accompanied by MVP profiles, measuring temperature, conductivity (hence salinity) and fluorescence. The MVP is performing profiles downward in a free-fall mode and upward, towed by a cable. This instrument is subject to many errors. Here we have first corrected the sensors offset between the CTD and MVP. Second, we have also corrected the thermistor viscous heating and the thermal lag between the thermistor and the conductivity cell. Third, we have corrected the thermal mass error on the lowering profiles. Only temperature and conductivity/salinity measurements are corrected. Important Note: This submission has been initially submitted to SEA scieNtific Open data Edition (SEANOE) publication service and received the recorded DOI. The metadata elements have been further processed (refined) in EMODnet Ingestion Service in order to conform with the Data Submission Service specifications.

Two quality controlled datasets here archived were collected during the oceanographic cruise MEIO that held in October-November 2022 over the South Western Indian Ocean, onboard S.A. Agulhas II. The first dataset is composed of continuous vertical profiles of the 12 oceanographic stations. The profiles have a resolution of 1dbar. The parameters reported in this data set are: pressure (in dbar), in-situ temperature (in °C), practical salinity, dissolved oxygen concentration (in µmol/kg), fluorescence of calibrated chlorophyll-a fluorescence (in µg/L), nitrate concentration (in µmol/kg) and particle attenuation @660nm (in 1/m). The second dataset is composed of discrete samples collected during the 12 stations. The parameters are the sensors measurements of every samples, dissolved oxygen concentration measured by the Winkler method (in µmol/kg), practical salinity measured by Autosal, concentration of silicate (in µmol/kg), concentration of phosphate (in µmol/kg) , concentration of nitrite (in µmol/kg), concentration of nitrate (in µmol/kg), concentration of pigments (processed by HPLC). These datasets aim to contribute to the extension of the One-Argo programme in the southwestern area of the Indian Ocean through the deployment of a significant number of floats; and to collect reference measurements through a multi-instrumented CTD rosette, allowing in particular to calibrate the robots’ sensors, just before their deployment. The two datasets were collected in concomitancy with the deployment of 29 One-Argo floats (WMO numbers : 5906536, 6903149, 4902620, 6903088, 6903148, 6990505, 5906970, 7901013, 4902626, 6903150, 5906972, 6903031, 5906540, 5906969, 4902623, 6990503, 3902471, 5906539, 6990504, 1902572, 5906537, 4902628, 7901003, 3902472, 6903033, 5906538, 1902573, 6903084, 5906971). Important Note: This submission has been initially submitted to SEA scieNtific Open data Edition (SEANOE) publication service and received the recorded DOI. The metadata elements have been further processed (refined) in EMODnet Ingestion Service in order to conform with the Data Submission Service specifications.

Since its establishment in 2010, the Mayotte Marine Natural Park has been promoting fishing activities beyond the lagoon, specifically targeting pelagic species to alleviate fishing pressure on reef species. However, despite these efforts, catches of reef fish remain notably high. In 2020, reef carnivores (groupers, snappers…), constituted approximately 35% of the total catches. Ensuring the sustainability of reef fishing necessitates regular assessments of Mayotte's commercial reef fish populations. This study aims to evaluate the current status of these populations and comprehend their dynamics by comparing them with historical data. Scuba diving was employed for the assessment of ichthyological populations and habitat description. In 2023, a total of 96 sites, comprising 1,100 stations (Stationary visual census), were sampled, covering a combined sampled area of 169,400 m2, with an in situ observation duration totalling 110 hours. Important Note: This submission has been initially submitted to SEA scieNtific Open data Edition (SEANOE) publication service and received the recorded DOI. The metadata elements have been further processed (refined) in EMODnet Ingestion Service in order to conform with the Data Submission Service specifications.

Since 2015, 12 representative sites of the Mahoran reefs have been equipped on the sub-surface with probes measuring the temperature every 10 minutes (every 1 hour since mid-2021). The data from these probes are collected every 2 months by the Operations Department of the Parc marin de Mayotte. The aim is to better understand seasonal variations and bleaching phenomena. A computer program developed by the PNMM makes it possible to analyse these data. Regularly, new probes are purchased (NKE) and calibration tests are carried out. Depth: Baie de Boueni: 3,67 Double barrière: 4,15 Grand Récif Nord Est: 3,04 Longoni: 5,02 Passe bateaux sud: 3,25 Passe en S - bouée 3: 4,39 Passe en S - externe: 4,15 Saziley: 4,43 Surprise: 2,98 Tanaraki: 2,92 Hajangoua: 4,55   Cood : Baie de Boueni: -12.9117722; 45.1349777 (-12°54.726'S; 45°08.099'E) Double barrière: -13.00181667; 45.11048333 (-13°00.109'S; 45°06.629'E) Grand Récif Nord Est: -12.74848333; 45.27966667 (-12°44.909'S; 45°16.780'E) Hajangoua: -12.8383888; 45.2401333 (-12°49.033'S; 45°13.873'E) Longoni: -12.71003; 45.16542 (-12°42.602'S; 45°09.925'E) Passe bateaux sud: -12.9815555; 44.9880833 (-12°58.881'S; 44°59.296'E) Passe en S - bouée 3: -12.86556667; 45.27113333  (-12°51.934'S; 45°16.268'E) Passe en S - externe: -12.87976667; 45.27708333  (-12°52.780'S; 45°16.625'E) Saziley: -12.98563333; 45.18245 (-12°59.138'S; 45°10.947'E) Surprise: -12.64603333; 45.13325 (-12°38.762'S; 45°07.995'E) Tanaraki: -12.76168333; 45.06656667 (-12°45.701'S; 45°03.994'E) Important Note: This submission has been initially submitted to SEA scieNtific Open data Edition (SEANOE) publication service and received the recorded DOI. The metadata elements have been further processed (refined) in EMODnet Ingestion Service in order to conform with the Data Submission Service specifications.

This dataset contains nifH gene copy numbers, growth rates, and grazing mortality rates of the major unicellular cyanobacterial diazotroph taxa (UCYN-A1, -A2/3/4, -B and -C), and growth rates and grazing mortality rates of total phytoplankton community (inferred by chlorophyll a) in the South China Sea and the Luzon Strait. The associated physicochemical factors including temperature, salinity, nitrate+nitrite, ammonium, phosphate, and chlorophyll a are also available in this dataset. All these data were collected during a research cruise (Cruise No. kk1801) aboard the R/V Tan Kah Kee in early February 2018. Important Note: This submission has been initially submitted to SEA scieNtific Open data Edition (SEANOE) publication service and received the recorded DOI. The metadata elements have been further processed (refined) in EMODnet Ingestion Service in order to conform with the Data Submission Service specifications.

Mean Integrated concentrations of oceanographic parameters in the water column and sediment data in the coastal zone of the Red Sea and the Arabian Gulf (Saudi Arabia) Important Note: This submission has been initially submitted to SEA scieNtific Open data Edition (SEANOE) publication service and received the recorded DOI. The metadata elements have been further processed (refined) in EMODnet Ingestion Service in order to conform with the Data Submission Service specifications.

Distribution of five mitochondrial haplotypes among 176 individuals , and multilocus genotypes at the eight microsatellite loci analysed for a total of 177 individuals, obtained for the vesicomyid bivalve Christineconcha regab from chemiosynthetic sites of the West African Equatorial margin. Important Note: This submission has been initially submitted to SEA scieNtific Open data Edition (SEANOE) publication service and received the recorded DOI. The metadata elements have been further processed (refined) in EMODnet Ingestion Service in order to conform with the Data Submission Service specifications.

Hydrographic conditions along a northeastern section off the eastern coast of Qatar Peninsula, Arabian Gulf were measured seasonally for the first time. Six sampling stations, along a 105-km section perpendicular to the major axis of the Gulf, were visited five times within one year (October 2012, January 2013, April 2013, June 2013, and August 2013) to investigate seasonal and spatial variations in hydrographic conditions of Qatar’s exclusive economic zone. Important Note: This submission has been initially submitted to SEA scieNtific Open data Edition (SEANOE) publication service and received the recorded DOI. The metadata elements have been further processed (refined) in EMODnet Ingestion Service in order to conform with the Data Submission Service specifications.