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| Acolas, M; Veron, V; Jourdan, H; Begout, Marie-laure; Sabatie, M; Bagliniere, J.l.. |
| The characteristics and activity of adult allis shad [Alosa alosa (L.)] were analysed during the last part of their upstream migration in the L'Aulne, a small river in Brittany, and during reproduction on a unique spawning ground downstream of an insurmountable dam. The age of the spawners ranged front three to seven years, females being larger and older than males. Population-level migration and reproduction were studied by counting the number of migrating fish, by estimating the sex ratio, and by counting the number of nocturnal spawning acts for three consecutive years starting in 2000. The influence of the environment, especially water temperature and discharge, was highlighted: temperature during migration may supplant the influence of water flow,... |
| Tipo: Text |
Palavras-chave: Small river; Reproduction; Biological features; Anadromous migration; Allis shad. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-1214.pdf |
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| Jadot, Catherine; Donnay, A; Acolas, M; Cornet, Y; Begout, Marie-laure. |
| Acoustic telemetry was used to record diel movement and habitat utilization of the salema (Sarpa salpa) (Teleostei: Sparidae) during three consecutive summers from 2000 to 2002 in the Calvi and Achiarina bays of Corsica in the Mediterranean Sea. A total of 18 fish was equipped with acoustic transmitters inserted in the body cavity, 13 were tracked in the Bay of Calvi (275 mm +/- 26.9 L-F), and 5 in Achiarina Bay (260 mm +/- 33.6 LF). Two different systems were used to track the fish. The one used in the Bay of Calvi was a manual receiver and a directional hydrophone. The second system, used in Achiarina Bay, was a radioacoustic-positioning (RAP) system that continuously monitored the movements of the fish. Fish positions were put in a geographic... |
| Tipo: Text |
Palavras-chave: VRAP; Telemetry; Sarpa salpa; Manual tracking; Homing; Home range; Habitat utilization; GIS. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-1107.pdf |
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| Wilson, M; Acolas, M; Begout, Marie-laure; Madsen, P; Wahlberg, M. |
| Most fish cannot hear frequencies above 3 kHz, but a few species belonging to the subfamily Alosinae (family Clupeidae) can detect intense ultrasound. The response of adult specimens of the European allis shad (Alosa alosa) to sinusoidal ultrasonic pulses at 70 and 120 kHz is tested. The fish showed an intensity-graded response to the ultrasonic pulses with a response threshold between 161 and 167 dB re 1 mu Pa (pp) for both frequencies. These response thresholds are similar to thresholds derived from juvenile American shad (Alosa sapidissima) in previous studies, supporting the suggestion that these members of Alosinae have evolved a dedicated ultrasound detector adapted to detect and respond to approaching echolocating toothed whales. (C) 2008 Acoustical... |
| Tipo: Text |
Palavras-chave: Zoology; Ultrasonics; Biocommunications; Bioacoustics. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-6118.pdf |
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