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| Baidai, Y; Dagorn, Laurent; Amande, Mj; Gaertner, Daniel; Capello, Manuela. |
| The aggregative behavior of tuna around floating object is widely exploited by the industrial purse-seine fishery, which deploy thousands of floating objects each year in all oceans in order to improve their catches. These fish aggregating devices (FADs) are generally equipped with echosounder buoys that can collect acoustic data, conferring to these devices the status of privileged observation platforms for the fish communities that aggregate. Using a classification model based on supervised learning algorithms trained on M3I buoy data, we were able to translate the acoustic data collected along the trajectories of 5748 drifting FADs newly deployed between 2016 and 2018 in the Indian Ocean into presence or absence of tuna aggregation. Analysis of the... |
| Tipo: Text |
Palavras-chave: Echosounders; Drifting fish aggregating devices (FAD); Tropical tunas; Behaviour. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00615/72694/71700.pdf |
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| Renard, V. |
| The side looking sonars have been developed for greater swath coverage, digital processing of the signals has improved the quality of the images and interferometric techniques have been used to determine the depth of the bottom features. A review of the systems existing today is presented. Documents such as graphs, block diagrams, images, maps, sections, created from data acquired at sea level suffer from a filtering or smoothing effect that restricts the representativity of the measured parameters and therefore limits their interpretation. The greater the depth of the seafloor, the greater the filtering. It is due not only to the nature of the measured phenomenon but also the characteristics of the sensors, to their operation and to the data processing.... |
| Tipo: Text |
Palavras-chave: Bathymetry; Cartography; Sensors; Echosounders; Acoustic imagery; Acoustics; Ocean floor; Seafloor mapping. |
| Ano: 1990 |
URL: http://archimer.ifremer.fr/doc/1990/acte-1147.pdf |
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| Linares, E.O.; Caballero, P.I.; Guillard, J.; Sierra, L.; Hernández, J.L.. |
| Se presentan los resultados de las ecuaciones acústicas de TS (Fuerza del Blanco acústico) en su aspecto dorsal de dos especies de peces de interés comercial (pargo criollo, Lutjanus analis y ronco amarillo, Haemulon sciurus) del Golfo de Batabanó, Cuba. Los trabajos se ejecutaron en Puerto Esperanza (Provincia de Pinar del Río) y zonas cercanas a Xcalak, península de Yucatán (México) en lugares de aguas claras y poco profundas con poca corriente, empleando métodos hidroacústicos. Para realizar las mediciones se utilizó una ecosonda de Doble Haz DT 5000 BIOSONICS, con transductor digital y frecuencia de 129 Khz. La profundidad a que se midieron los peces fue de 3 m. La ecuación obtenida para el ronco amarillo es TS(db) =21.9 log L(cm)– 69.2, para un r... |
| Tipo: Journal Contribution |
Palavras-chave: Echosounders; Target strength. |
| Ano: 2009 |
URL: http://hdl.handle.net/1834/3392 |
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