seanoe:71024 HABASQUE Jérémie Institut de Recherche pour le Développement, UMR LEMAR, IRD de Bretagne, BP70 29280 Plouzané, FRANCE 2021-12-30 ISO 19115:2003/19139 1.0 Acoustic data from FAROFA surveys, 2017-09-15 to 2019-04-22 2020 2021-12-30 Bertrand Arnaud, Salvetat Julie, Habasque Jérémie, Travassos Paulo, Assuncao Ramilla, Queiroz Syumara, Lopes Cristiano, Lebourges-Dhaussy Anne (2020). Acoustic data from FAROFA surveys, 2017-09-15 to 2019-04-22. SEANOE. https://doi.org/10.17882/71024 This dataset contains acoustic data collected around Fernando de Noronha Archipelago off northeast Brazil within the framework of Fish around Fernando de Noronha FAROFA surveys performed in sept 2017, April 2018 and April 2019. The authors acknowledge the owner and crew of the recreational fishing boat Tubarao Tigre for their contribution to the success of the operations. Part of the equipment used in this experiment was funded by the French Government, the European Fund for Economic and Regional Development, the Regional council of Brittany, and authorities of Finistère as part of the CPER project O3DO (2016-2020). BERTRAND Arnaud Institut de Recherche pour le Développement, UMR MARBEC, Université de Montpellier, CNRS, IFREMER, IRD, Sète, FRANCE SALVETAT Julie Institut de Recherche pour le Développement, UMR MARBEC, Université de Montpellier, CNRS, IFREMER, IRD, Sète, FRANCE Universidade Federal Rural de Pernambuco (UFRPE) Recife, BRAZIL HABASQUE Jérémie Institut de Recherche pour le Développement, UMR LEMAR, IRD de Bretagne, BP70 29280 Plouzané, FRANCE TRAVASSOS Paulo Universidade Federal Rural de Pernambuco (UFRPE) Recife, BRAZIL ASSUNCAO Ramilla Universidade Federal de Pernambuco (UFPE), BRAZIL QUEIROZ Syumara Universidade Federal de Pernambuco (UFPE), BRAZIL LOPES Cristiano Universidade Federal Rural de Pernambuco (UFRPE) Recife, BRAZIL LEBOURGES-DHAUSSY Anne Institut de Recherche pour le Développement, UMR LEMAR, IRD de Bretagne, BP70 29280 Plouzané, FRANCE SEANOE https://www.seanoe.org/data/00598/71024/illustration.gif BRAZIL Active acoustics Biodiversity Fish distribution Marine tropical ecosystem Biological oceanography Ocean Acoustics ODATIS aggregation parameters and Essential Variable names 2025-07-29 geonetwork.thesaurus.external.theme.NVS.OD1 Biological oceanography SeaDataNet Parameter Disciplines 2025-07-29 geonetwork.thesaurus.external.parameter.NVS.P08 /Observational data/in-situ Type de jeux de donnée ODATIS 2025-12-09 geonetwork.thesaurus.local.theme.type_jeux_donnee CC0 (Creative Commons - Transfer into public domain) Comprehensive Spatial Distribution of Tropical Fish Assemblages from Multifrequency Acoustics and Video Fulfils the Island Mass Effect Framework 2021 Research Square Platform LLC SALVETAT JULIE BEZ NICOLAS HABASQUE JEREMIE LEBOURGES-DHAUSSY ANNE LOPEZ CRISTIANO ROUDAUT GILDAS SIMIER MONIQUE TRAVASSOS PAULO VARGAS GARY BERTRAND ARNAUD 10.21203/rs.3.rs-1061965/v1 Underwater video observations from FAROFA surveys, 2017-09-15 to 2019-04-22 2020 SEANOE Salvetat Julie Lopes Da Silva Cristiano Alves Pereira Cristielen Lebourges-Dhaussy Anne Habasque Jeremie Travassos Paulo Bertrand Arnaud 10.17882/76019 Insitu target strength measurement of the black triggerfish Melichthys niger and the ocean triggerfish Canthidermis sufflamen 2020 CSIRO Publishing Salvetat Julie Lebourges-Dhaussy Anne Travassos Paulo Gastauer Sven Roudaut Gildas Vargas Gary Bertrand Arnaud 10.1071/mf19153 CTD data from FAROFA surveys, 2017-09-05 to 2019-04-22 2019 SEANOE Bertrand Arnaud Habasque Jérémie Salvetat Julie Lebourges-Dhaussy Anne Assuncão Ramilla Queiroz Syumara Grelet Jacques 10.17882/70647 10.17600/18001399 10.17600/18001411 10.17600/18001381 oceans -32.3 -32.8 -4.0 -3.7 2017-09-15 2019-04-22 NC, NETCDF https://www.seanoe.org/data/00598/71024/data/75458.nc WWW:DOWNLOAD-1.0-link--download Quality controlled data FAROFA 1 echointegrated data from 15/09/2017 to 21/09/2017 - 3 GB https://www.seanoe.org/data/00598/71024/data/75714.nc WWW:DOWNLOAD-1.0-link--download Quality controlled data FAROFA 3 echointegrated data from 15/04/2019 to 22/04/2019 - 9 GB https://www.seanoe.org/data/00598/71024/data/75824.nc WWW:DOWNLOAD-1.0-link--download Quality controlled data FAROFA 2 echointegrated data from 17/04/2018 to 22/04/2018 - 5 GB https://doi.org/10.17882/71024 DOI DOI of the product https://www.seanoe.org/data/00598/71024/ rel-canonical Seanoe Data were collected continuously throughout the survey with two calibrated echosounders (Foote et al., 1987) SIMRAD EK80 connected to two 7° splitbeam transducers centred on the frequencies of 70 kHz and 200 kHz, operated simultaneously in narrow band (CW) transmission. Transducers were attached with a stainless-steel pole on the port side of a sport fishing boat (10 m long). The acquisition was performed with transmitted powers of 600 W and 90 W for 70 and 200 kHz, respectively. With the aim of measuring target strength (TS) and track individual detections, the ping rate was set to “maximum” for a maximum acquisition range of 100 m (on the continental shelf) and to 1 ping per sec, off the shelf, where the maximum acquisition range was set to 400 m. Due to the rather windy condition around Fernando de Noronha pulse duration had to be long enough to improve the signal-to-noise ratio and the maximum range for the two transducers. A pulse duration of 1.024 ms for both frequencies was a good compromise between a pulse long enough allowing low noise at the maximum range of 400 m at 70 kHz, an identical pulse duration at both frequencies, easier for further processing and short enough to separate individual fish by about 40 cm. Continuous measurements were made at a typical vessel speed of 3.5 knots. During FAROFA 3 survey, one day was dedicated to a magic square operation during twelve hours from 2 pm to 2 am. Acoustic data were scrutinized, corrected and analysed using the “Movies3D” software developed at the “Institut Français de Recherche pour l'Exploitation de la Mer” (Ifremer; Trenkel et al., 2009) combined with the French “Institut de Recherche pour le Développement” (IRD) open source tool “Matecho” (Perrot et al., 2018), developed in MATLAB. The near-field noise was removed (3 m deep from the transducer, that is 9 m deep from the surface) from the analysis; phantom bottom echoes were excluded and the bottom line was corrected manually. Echograms were cleaned by eliminating unwanted signals such as one impulsive noise, transient noise due to the interferences with other electronic devices or other sources. Background noise was estimated and subtracted using methods described by De Robertis and Higginbottom (2007). The weather was very quiet during these surveys, thus no further cleaning was necessary. The acoustic nautical area scattering coefficient (sA in m2 nmi-2 or NASC), an indicator of marine organisms biomass, and the acoustic volume backscattering strength (Sv in dB re 1m-1), an indicator of marine organisms density, were calculated. Data were echo-integrated onto 1 m high layers over 3 pings ESDU (elementary sampling distance unit) with a -90 dB threshold. The data provided are the results of the echointegration processing. Sensors metadata and variables are described in the report "ICES. 2016. A metadata convention for processed acoustic data from active acoustic systems. Series of ICES Survey Protocols SISP 4-TG-AcMeta. 48 pp".