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A method for controlled target strength measurements of pelagic fish, with application to European anchovy ( Engraulis encrasicolus ) ArchiMer
Doray, Mathieu; Berger, Laurent; Le Bouffant, Naig; Coail, Jean-yves; Vacherot, Jean-philippe; De La Bernardie, Xavier; Moriniere, Pierre; Lys, Elisabeth; Schwab, Romain; Petitgas, Pierre.
Measuring fish target strength (TS) in the wild is challenging because: (i) TS varies versus physical (orientation relative to the incident sound wave, size, and depth) and physiological fish attributes (maturity and condition), (ii) the target species and its aforementioned attributes are difficult to assess in near real time, and (iii) in the case of packed fish schools, accepted echoes may originate from multiple unresolved targets. We propose a method for controlled TS measurements of densely packed small pelagic fish during daytime, based on the joint use of a Remotely Operated Towed Vehicle, “EROC”, with a pelagic trawl fitted with a codend opening system, “ENROL”. EROC, equipped with a 70-kHz split-beam echosounder (Simrad EK60) and a low-light...
Tipo: Text Palavras-chave: Acoustics; Deformed cylinder model; Engraulis encrasicolus; Remotely operated vehicle; Target strength; Video.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00346/45693/45623.pdf
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Biofouling protection by electro-chlorination on optical windows for oceanographic sensors and imaging devices ArchiMer
Delauney, Laurent; Boukerma, Kada; Bucas, Karenn; Coail, Jean-yves; Debeaumont, Mathieu; Forest, Bertrand; Garello, Celia; Guyader, Gerard; Le Bras, Yves; Peleau, Michel; Rinnert, Emmanuel.
Oceans environmental monitoring and seafloor exploitation need in situ sensors and optical devices (cameras, lights) in various locations and on various carriers in order to initiate and to calibrate environmental models or to operate underwater industrial process supervision. For more than 10 years Ifremer deploys in situ monitoring systems for various seawater parameters and in situ observation systems based on lights and HD Cameras. To be economically operational, these systems must be equipped with a biofouling protection dedicated to the sensors and optical devices used in situ. Indeed, biofouling, in less than 15 days [1] will modify the transducing interfaces of the sensors and causes unacceptable bias on the measurements provided by the in situ...
Tipo: Text
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00349/45998/45667.pdf
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EMSO-Azores: six years of continuous monitoring of a deep sea hydrothermal vents – Technical results ArchiMer
Legrand, Julien; Blandin, Jerome; Sarradin, Pierre-marie; Cannat, Mathilde; Coail, Jean-yves; Pichavant, Pascal; Guyader, Gerard; Lanteri, Nadine; Carval, Thierry; Momarsat Team,.
Since 2010, the EMSO Azores non-cabled deep sea observatory acquires scientific data on the Lucky Strike vent field on the mid Atlantic ridge. This paper presents the marine infrastructure of EMSO Azores observatory needed to acquire and transmit data in near real time 24/day during six years. It details technical results obtained during this period.
Tipo: Text Palavras-chave: Non-cabled observatory; Near real-time; COSTOF; EMSO; Long-term subsea monitoring.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00366/47766/47816.pdf
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HOT 96 News ArchiMer
Gaill, Francoise; Felbeck, Horst; Desbruyeres, Daniel; Lallier, Francois; Toulmond, A.; Alayse, Anne-marie; Briand, Patrick; Brulport, Jean-pierre; Caprais, Jean-claude; Chevaldonne, P.; Coail, Jean-yves; Cosson, R.; Crassous, Philippe; Delachambre, J.; Durif, C.; Echardour, L.; Herve, G.; Hourdez, Stephane; Jollivet, D.; Kerdoncuff, Jacques; Khripounoff, Alexis; Lechaire, J.p.; Pruski, Audrey; Ravaux, Juliette; Sarradin, Pierre-marie; Shillito, Bruce; Toullec, J.y.; Arndt, C.; Fisher, C.; Lutz, Richard; Childress, J..
Tipo: Text
Ano: 1996 URL: http://archimer.ifremer.fr/doc/00179/29003/27431.pdf
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In-situ measurements of the individual acoustic backscatter of European anchovy (Engraulis encrasicolus) and sardine (Sardina Pilchardus), with concurrent optical identification ArchiMer
Doray, Mathieu; Berger, Laurent; Coail, Jean-yves; Vacherot, Jean-philippe; Bavouzet, Gerard; Petitgas, Pierre.
The lack of specific Target Strength (TS) values for European anchovy (Engraulis encrasicolus) and sardine (Sardina Pilchardus) in the literature has been pointed out by the Working Group on Acoustic and Egg Surveys for Sardine and Anchovy in ICES Areas VIII and IX. The need for specific small pelagics TS measurements conducted in controlled environments was recognized by the group, to further investigate the adequacy of TS length equation used to derive fish stock estimates for clupeids in European waters. TS is a stochastic variable which largely varies in the wild, in response to changes in physical (tilt angle, depth) or biological (physiology) single fish attributes. The first requirement to make sound TS measurement is to accurately identify of the...
Tipo: Text
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00055/16637/14133.pdf
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Studies of a full-scale mechanical prototype line for the ANTARES neutrino telescope and tests of a prototype instrument for deep-sea acoustic measurements ArchiMer
Ageron, M; Aguilar, J; Albert, A; Ameli, F; Anghinolfi, M; Anton, G; Anvar, S; Ardellier Desages, F; Aslanides, E; Aubert, J; Auer, R; Barbarito, E; Basa, S; Battaglieri, M; Bazzotti, M; Becherini, Y; Bethoux, N; Beltramelli, J; Bertin, V; Bigi, A; Billault, M; Blaes, R; De Botton, N; Bouwhuis, M; Bruijn, R; Brunner, J; Burgio, G; Busto, J; Cafagna, F; Caillat, L; Calzas, A; Capone, A; Caponetto, L; Carmona, E; Carr, J; Castel, D; Castorina, E; Cavasinni, V; Ceechini, S; Ceres, A; Charvis, P; Chauchot, Pierre; Chiarusi, T; Circella, M; Coail, Jean-yves; Colnard, C; Compere, Chantal; Coniglione, R; Cottini, N; Coyle, P; Cuneo, S; Cussatlegras, A; Damy, Gilbert; Van Dantzig, R; Debonis, G; De Marzo, C; De Vita, R; Dekeyser, I; Delagnes, E; Denans, D; Deschamps, Anne; Dessa, J; Destelle, J; Dinkespieler, B; Distefano, C; Donzaud, C; Drogou, Jean-francois; Druillole, F; Durand, D; Ernenwein, J; Escoffier, S; Falchini, E; Favard, S; Fehr, F; Feinstein, F; Florello, C; Flaminio, V; Fratini, K; Fuda, J; Galeotti, S; Gallone, J; Giacomelli, G; Girard, N; Gojak, C; Goret, P; Graf, K; Guilloux, F; Hallewell, G; Harakeh, M; Hartmann, B; Heijboer, A; Heine, E; Hello, Y; Hernandez Rey, J; Hossl, J; Hoffman, C; Hogenbirk, J; Hubbard, J; Jaquet, M; Jaspers, M; De Jong, M; Jouvenot, F; Kalantar Nayestanaki, N; Kappes, A; Karg, T; Katz, U; Keller, P; Kneib, J; Kok, E; Kok, H; Kooijman, P; Kopper, C; Kouchner, A; Kretschmer, W; Kruijer, A; Kuch, S; Lagier, P; Lahmann, R; Lamanna, G; Lamare, P; Lambard, G; Languillat, J; Laschinsky, H; Lavalle, J; Le Guen, Yvon; Le Provost, H; Van Suu, A; Lefevre, D; Legou, T; Lelaizant, G; Lim, G; Lo Presti, D; Loaec, Gerard; Loehner, H; Loucatos, S; Louis, F; Lucarelli, F; Lyashuk, V; Mangano, S; Marcelin, M; Margiotta, A; Masullo, R; Mazeas, Florence; Mazure, A; Megna, R; Melissas, M; Migneco, E; Mongelli, M; Montaruli, T; Morganti, M; Moscoso, L; Motz, H; Musumeci, M; Naumann, C; Naumann Godo, M; Niess, V; Noble, A; Olivetto, C; Ostasch, R; Palanque Delabrouille, N; Payre, P; Peek, H; Perez, Amparo; Petta, C; Piattelli, P; Pillet, R; Pineau, J; Poinsignon, J; Popa, V; Pradier, T; Racca, C; Randazzo, N; Van Randwijk, J; Real, D; Regnier, M; Van Rens, B; Rethore, F; Rewiersma, P; Riccobene, G; Rigaud, Vincent; Ripani, M; Roca, V; Roda, C; Rolin, Jean-francois; Rostovtsev, A; Roux, Jean; Ruppi, M; Russo, G; Rusydi, G; Salesa, F; Salomon, K; Sapienza, P; Schmitt, F; Schuller, J; Shanidze, R; Sokalski, I; Spona, T; Spurio, M; Van Der Steenhoven, G; Stolarczyk, T; Streeb, K; Sulak, L; Taiuti, M; Tamburini, C; Tao, C; Tasca, L; Terreni, G; Urbano, F; Valdy, Pierre; Valente, V; Vallage, B; Vaudaine, G; Venekamp, G; Verlaat, B; Vernin, P; Van Wijk, R; Wijnker, G; Wobbe, G; De Wolf, E; Yao, A; Zaborov, D; Zaccone, H; Zornoza, J; Zuniga, J.
full-scale mechanical prototype line was deployed to a depth of 2500 m to test the leak tightness of the electronics containers and the pressure-resistant properties of an electromechanical cable under evaluation for use in the ANTARES deep-sea neutrino telescope. During a month-long immersion study, line parameter data were taken using miniature autonomous data loggers and shore-based optical time domain reflectometry. Details of the mechanical prototype line, the electromechanical cable and data acquisition are presented. Data taken during the immersion study revealed deficiencies in the pressure resistance of the electromechanical cable terminations at the entry points to the electronics containers. The improvements to the termination, which have been...
Tipo: Text Palavras-chave: Sea deployment; Electromechanical cable; Optical time domain reflectometry; Leak detection; Underwater neutrino telescope; ANTARES.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-3519.pdf
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