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Aerial and snorkelling census techniques for estimating green turtle abundance on foraging areas: A pilot study in Mayotte Island (Indian Ocean) ArchiMer
Roos, David; Pelletier, Dominique; Ciccione, Stéphane; Taquet, Marc; Hughes, George.
Monitoring the abundance of green turtles (Chelonia mydas) is necessary to assess population trends and risks of collapse. This note presents a study aimed at comparing three techniques for the direct estimation of green turtle numbers in their foraging habitats (seagrass beds and reef flats). The experiment was carried out at Mayotte Island, Western Indian Ocean. The techniques involved were surveys by snorkel, and aerial surveys using a microlight aircraft and a paramotor. Each technique had shortcomings and advantages. While each technique provided estimations of turtle numbers only surveys by snorkel permitted identification of species and sex, whenever visibility and turtle behaviour permitted. Along the shorelines, and over foraging areas, the...
Tipo: Text Palavras-chave: Foraging habitats; Snorkelling survey; Aerial survey; Abundance estimation; Chelonia mydas; Green turtle.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/publication-432.pdf
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Age and growth of blackfin tuna (Thunnus atianticus) caught under moored fish aggregating devices, around Martinique Island ArchiMer
Doray, Mathieu; Stequert, Bernard; Taquet, Marc.
Daily growth increments measured in the otolith of Thunnus atlanticus were used to estimate the age and growth of individuals. which were sampled from an artisanal fishery operating around fish aggregating devices (FADs) moored off Martinique Island. In this study, 76 otoliths were analysed for fish ranging from 20 to 68 cm fork lengths (FL). The fish were caught using trolling lines at depths ranging from 0 to 10 m. Counts were made, under a light microscope, on the external part of the transverse section of the sagittae, from the primordium to the ventral edge. The mean coefficient of variation of the age reading was 2.4%. To validate readings, the number of increments for 11 individuals was counted using both optic and scanning electron microscopes. The...
Tipo: Text Palavras-chave: Thunnus atlanticus; Daily increment; Otolith; Age.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/publication-396.pdf
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An updated checklist of the marine fish fauna of Reunion Island, South-Western Indian Ocean ArchiMer
Letourneur, Yves; Chabanet, Pascale; Durville, Patrick; Taquet, Marc; Teissier, Emmanuel; Parmentier, Maurice; Quero, Jean-claude; Pothin, Karine.
The ichthyofauna of Reunion Island, Southwestern Indian Ocean, was sampled during several ecological and artisanal fisheries studies. Information from these investigations and from other sources were included to compile the present checklist of the marine fishes of the island. A total of 885 species belonging to 150 families was recorded. Nine species are known only from Reunion, indicating endemism of about 1.0%. The most speciose families (Labridae, Gobiidae, Serranidae, and Pomacentridae) were also among the most speciose at the neighbouring Mauritius Island (except gobiids), and, generally, on other islands in the Indian Ocean area (Maldives, Chagos, Madagascar and Christmas Island). The Gobiidae only represented 5.4% of the ichthyofauna, which was...
Tipo: Text Palavras-chave: Biogeography; Checklist; Reunion Island; ISW; Marine ichthyofauna.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/publication-713.pdf
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Atelier de travail sur les poissons à rostre Commission thonière de l'Océan Indien. Etude de la croissance de l'espadon (Xiphias gladius) ArchiMer
Vanpouille, Karine; Poisson, Francois; Taquet, Marc; Ogor, Andre; Troadec, Herve.
Tipo: Text
Ano: 2001 URL: http://archimer.ifremer.fr/doc/00129/24028/21987.pdf
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Behavior of dolphinfish (Coryphaena hippurus) around drifting FADs as observed from automated acoustic receivers ArchiMer
Taquet, Marc; Dagorn, L; Gaertner, J; Girard, C; Aumerruddy, R; Sancho, G; Itano, D.
To study the behavior of dolphinfish (Coryphaena hippurus) around drifting Fish Aggregating Devices (FADs), we tagged individuals with long-lived, coded sonic transmitters and attached automated sonic receivers to drifting FADs in two regions of the Western Indian Ocean. Among the three tagging methods used in this study (surgery, external hooks, underwater bait without capture), the latest resulted in residence times significantly shorter than the other ones, likely due to regurgitation. Dolphinfish tagged with the two other methods usually stayed several days associated to FADs (Kaplan-Meier survival analysis 5.09 days, mean 6.25 days, SD 4.39 days, maximum 15.26 days), drifting with them. There was no significant difference in the residence times of...
Tipo: Text Palavras-chave: Indian Ocean; Meeting point; Ecological trap; Behavior of fish; Ultrasonic telemetry; Acoustic tagging; FAD; Dolphinfish.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-3733.pdf
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Blackfin tuna (Thunnus atlanticus) fishing around FADs in Martinique (French West Indies) ArchiMer
Taquet, Marc; Reynal, Lionel; Laurans, Martial; Lagin, Alain-sabin.
This paper examines the fishing of blackfin tuna (Thunnus atlanticus) around Fish Aggregating Devices (FADs) in Martinique (French West Indies). It is based on the compared analysis of catches from monthly experimental fishing surveys and sampling of commercial landings. The data collected in these two different ways allowed comparison of blackfin tuna length frequencies. A large part of the commercial landings were made up of young immature tuna with a fork length of less than 40 cm, whereas the experimental longline catches were mainly made up of fish with a fork length ranging between 55 and 75 cm. We give evidence that these discrepancies were mostly due to the fishing technique used. Indeed, contrarily to the experimental surveys, Martinican fishermen...
Tipo: Text Palavras-chave: Martinique; West Central Atlantic; Experimental fishing survey; Biology; FAD; Fish aggregating device; Thunnus atlanticus; Blackfin tuna.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/2000/publication-1392.pdf
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Caracteristiques topographiques et thermiques d'un site de ponte majeur de la tortue verte Chelonia mydas dans l'Ocean Indien sud-ouest: Europa ArchiMer
Le Gall, Jean-yves; Taquet, Marc; Cluet, Denis; Biais, Gerard.
The beach of the meteorological station of Europa Island (Indian Ocean S.W.) is a major nesting site for the green turtle. Altimetric distribution of nests on the beach is such than 95 % of nests are laid in the band located between 1.25 and 3 m above the mean level of upper tides. Nest density is a function of adult females number and varies from 0.175 to 0.043 nest/m2 for the two analyzed nesting seasons. Ground temperatures at 60 cm and 100 cm depth range from 22 (winter) to, 30°C (summer). Interannual variability of ground temperature at same depth (incubation depth) is 1.5° C from extreme hot to cold years. These intra and interannual variations are supposed to have an effect upon the sex-ratio of hatchlings
Tipo: Text Palavras-chave: Tortue verte; Chelonia mydas; Ponte; Distribution; Température; Incubation; Green turtle; Chelonia mydas; Nest; Distribution; Temperature; Incubation.
Ano: 1988 URL: http://archimer.ifremer.fr/doc/00113/22407/20104.pdf
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Characteristics of swordfish (Xiphias gladius) catches achieved by experimental fishing using instrumented longline in the Seychelles exclusive economic zone (EEZ):preliminary results of an experimental long line fishing program: « Programme d’Action de la Pêche Palangrière Seychelloise – PAPPS » ArchiMer
Wendling, Bertrand; Lucas, Vincent; Bargain, Rose Marie; Poisson, Francois; Taquet, Marc.
Tipo: Text
Ano: 2003 URL: http://archimer.ifremer.fr/doc/00130/24082/22059.pdf
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Characterizing fish communities associated with drifting fish aggregating devices (FADs) in the Western Indian Ocean using underwater visual surveys ArchiMer
Taquet, Marc; Sancho, G; Dagorn, L; Gaertner, J; Itano, D; Aumeeruddy, R; Wendling, B; Peignon, C.
We adapted a visual census method, mainly used in demersal and reef fish studies, to characterize fish communities associated to drifting fish aggregating devices (FADs) in the Western Indian Ocean. Drifting FAD associated fishes from both equatorial (Seychelles) and tropical waters (Reunion Island) were examined by divers. A total of 32 species (belonging to 16 families) were observed associated with drifting FADs in equatorial waters, and 24 species (14 families) were found around FADs in tropical waters. Twenty species were found in both regions. The highest number of species observed at a single FAD was 18 (12 +/- 2, mean +/- SD) in equatorial and 13 (10 +/- 3) in tropical waters, not counting circumnatant species loosely associated with the FAD. Some...
Tipo: Text Palavras-chave: Indian Ocean; Reunion Island; Seychelles; Fish aggregations; Visual census; Drifting FAD; Pelagic fishes.
Ano: 2007 URL: https://archimer.ifremer.fr/doc/00602/71370/69818.pdf
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Characterizing fish communities associated with drifting fish aggregating devices (FADs) in the Western Indian Ocean using underwater visual surveys ArchiMer
Taquet, Marc; Sancho, G; Dagorn, L; Gaertner, J; Itano, D; Aumeeruddy, R; Wendling, B; Peignon, C.
We adapted a visual census method, mainly used in demersal and reef fish studies, to characterize fish communities associated to drifting fish aggregating devices (FADs) in the Western Indian Ocean. Drifting FAD associated fishes from both equatorial (Seychelles) and tropical waters (Reunion Island) were examined by divers. A total of 32 species (belonging to 16 families) were observed associated with drifting FADs in equatorial waters, and 24 species (14 families) were found around FADs in tropical waters. Twenty species were found in both regions. The highest number of species observed at a single FAD was 18 (12 +/- 2, mean +/- SD) in equatorial and 13 (10 +/- 3) in tropical waters, not counting circumnatant species loosely associated with the FAD. Some...
Tipo: Text Palavras-chave: Indian Ocean; Reunion Island; Seychelles; Fish aggregations; Visual census; Drifting FAD; Pelagic fishes.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-3734.pdf
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Comparaison des captures des grands poissons pelagiques en Martinique avec ou sans DCP ArchiMer
Laurans, Martial; Taquet, Marc; Reynal, Lionel; Lagin, Alain-sabin.
In recent years, the use of fads in Martinique has evolved from an experimental stage to a productive one. This transformation results in the pitching up of operational device park by the regional fishery committee. Nevertheless, this technical change in fishing practices is not implemented in a homogeneous way all around the island; some differences exist especially between the Atlantic and the Caribbean coasts. From surveys carried out during an annual cycle on two main landing sites, this study describes the pelagic fishing activity around fads and in the open sea. A comparison of fishing strategies adopted in different places as well as an analysis of the results obtained by the fishing units in terms of species (size of catches and daily yields) allow...
Tipo: Text Palavras-chave: Artisanal fishing Attracting techniques Multivariate analysis Pelagic fisheries Sampling Tuna fisheries Article Geographic Terms: ASW; Caribbean Sea; Lesser Antilles; Martinique.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00042/15298/12657.pdf
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Country report reunion swordfish fishery (France) ArchiMer
Poisson, Francois; Taquet, Marc.
Tipo: Text
Ano: 2001 URL: http://archimer.ifremer.fr/doc/00129/24046/22008.pdf
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DCP employés par les pêcheries artisanales et industrielles : une question d'échelle. L’utilisation et le développement technique des DCP au coeur de la conférence de Tahiti sur les DCP ArchiMer
Taquet, Marc; Blanc, Michel; Dagorn, Laurent; Filmalter, John David; Fonteneau, Alain; Forget, Fabien; Gaertner, Jean-claude; Galzin, René; Gervain, Paul; Goujon, Michel; Guillotreau, Patrice; Guyader, Olivier; Hall, Martin; Holland, Kim; Itano, David; Monteagudo, Jean-pierre; Morales-nin, Beatriz; Reynal, Lionel; Sharp, Michael; Sokimi, Williams; Tanetoa, Mainui; Yen Kai Sun, Stephen.
Tipo: Text
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00115/22657/20383.pdf
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Deep diving behavior observed in yellowfin tuna (Thunnus albacares) ArchiMer
Dagorn, Laurent; Holland, Kim N.; Hallier, Jean-pierre; Taquet, Marc; Moreno, Gala; Sancho, Gorka; Itano, David; Aumeeruddy, Ryaz; Girard, Charlotte; Million, Julien; Fonteneau, Alain.
Yellowfin tuna (Thunnus albacares) are known to preferentially occupy the Surface mixed layer above the thermocline and it has been Suggested that they are physiologically restricted to water lerriperatt.11-CS no more than 8 degrees C colder than Surface waters. However, we here report for dive data acquired from a large yellowfin tuna which demonstrate for the first time that this species is indeed capable of making prolonged dives into deep cold waters. A yellowfin tuna (134 cm fork length) caught near ail anchored fish aggregating device (FAD) in the Seychelles (Western Indian Ocean) was equipped with all internally implanted archival tag and released. The fish was recaptured 98 days later. As predicted for this species, this fish spent 85% of its time...
Tipo: Text Palavras-chave: Indian ocean; Yellowfin tuna; Swimming speed; Diving behavior; Vertical movements; Archival tap.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1402.pdf
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Démarche d'amélioration des DCP à la Martinique ArchiMer
Guillou, Annie; Lagin, Alain-sabin; Lebeau, Alain; Priour, Daniel; Repecaud, Michel; Reynal, Lionel; Sacchi, Jacques; Taquet, Marc.
Since 1983, the research on the optimal conception of FADs in Martinique was particularly focused on the improvement of their resistance to different maritime or human aggressions. Following several experimentations made with different types of fads, the choice was brought on light devices anchored in 1 500 to 2 000 m depths and an experimental approach was conducted to identify the causes of loss of fads and to attempt to modelize their hydrodynamic behaviour with relation to the sea conditions. Three mathematical models are used to simulate the fad behaviour under current action and swell, and to estimate the forces exerted on each part of the device. The results of this study are presented. The fad design used nowadays for the development of pelagic...
Tipo: Text Palavras-chave: Attracting techniques Fishing technology Maintenance and repair Tuna fisheries Article Geographic Terms: ASW; Caribbean Sea; Lesser Antilles Lesser Antilles; Martinique.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00042/15287/12673.pdf
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Dispositifs de concentration de poissons autour de l'Ile de la Réunion (Océan Indien) ArchiMer
Biais, Gerard; Taquet, Marc.
Dix dispositifs de concentration de poissons (DCP) ont été posés autour de l'Ile de La Réunion au cours de l'année 1988. Ils sont constitués de bouées supportant du matériel attractif (feuillards plastiques et filets) et mouillés entre 3 et 12 milles nautiques de la côte sur des fonds de 500 à 1500 mètres de profondeur. Un suivi de l'activité de péche à proximité des DCP a permis d'établir à 30 tonnes par DCP les captures annuelles effectuées dans la zone proche des DCP. Les thons (Thunnus albacares, Thunnus obesus) et les daurades (Coryphaena hippurus) constituent l'essentiel des prises. Il est difficile d'évaluer la réduction des coûts de production qu'induisent les DCP, néanmoins le coût d'un DCP est estimé de l'ordre de 1 à 2% de la production en...
Tipo: Text
Ano: 1990 URL: http://archimer.ifremer.fr/doc/00104/21489/19070.pdf
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Do FADs influence the geographical distribution of dolphinfish (Coryphaena hippurus)? ArchiMer
Taquet, Marc; Reynal, Lionel; Laurans, Martial.
For most fisheries, increasing the local production of pelagic fish is the main objective of Fish Aggregating Devices (fads). This does not rule out the existence of a larger-scale impact, especially on the migratory behaviour of fish. The analysis of data collected during 25 experimental fishing surveys around Martinique between 1995 and 1997 has led to the hypothesis that fads influence the migratory behaviour of young dolphinfish. Unlike recent studies of dolphinfish migration in the Caribbean, which tend to show an annual migration pattern with a seasonal passage through the French West Indies, the experimental fishing surveys done over more than a year on a monthly basis on a single cohort, show that the migratory pattern of part of the regional stock...
Tipo: Text Palavras-chave: Attracting techniques; Geographical distribution; Migrations; Migratory species; Pelagic fisheries; Tuna fisheries; Coryphaena hippurus.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00042/15321/12635.pdf
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Effects of lunar cycle and fishing operations on longline-caught pelagic fish: fishing performance, capture time, and survival of fish ArchiMer
Poisson, Francois; Gaertner, Jean-claude; Taquet, Marc; Durbec, Jean-pierre; Bigelow, Keith.
Commercial longline fishing data were analyzed and experiments were conducted with gear equipped with hook timers and time-depth recorders in the Reunion Island fishery (21 degrees 5'S lat., 53 degrees 28'E long.) to elucidate direct and indirect effects of the lunar cycle and other operational factors that affect catch rates, catch composition, fish behavior, capture time, and fish survival. Logbook data from 1998 through 2000, comprising 2009 sets, indicated that swordfish (Xiphias gladius) catch-per unit of effort (CPUE) increased during the first and last quarter of the lunar phase, whereas albacore (Thunnus alalunga) CPUE was highest during the full moon. Swordfish were caught rapidly after the longline was set and, like bigeye tuna (Thunnus obesus),...
Tipo: Text
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00011/12237/9019.pdf
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Enquête cadre sur la pêche artisanale Mahoraise ArchiMer
Biais, Gerard; Maggiorani, Jean-michel; Taquet, Marc.
L'enquête cadre sur la pêche mahoraise réalisée en 1987 visait à permettre I'organisation d'un échantillonnage en routine des débarquements de cette pêche. Elle en présente les caractéristiques (population, embarcations, techniques, production) avec, en conclusion, des pistes pour le développement de cette activité.
Tipo: Text
Ano: 1987 URL: http://archimer.ifremer.fr/doc/00071/18221/15789.pdf
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Estimation du nombre de tortues vertes femelles adultes Chelonia mydas par saison de ponte à Tromelin et Europa (Océan Indien) (1973-1985) ArchiMer
Le Gall, Jean-yves; Bosc, Pierre; Taquet, Marc.
A research programm on the marine green turtle Chelonia mydas nesting on the two major reproduction sites for the species in the Indian Ocean, conducled over last 15 years, included intensive tagging programm. Processing of these lagging data provides estimations of adult female populations {or each site and season from two independent methods. First classical method is the ratio of total number of nests produced over a define time on the mean individual number of nests by female during the same time (November, December, January). The computed mean individual number ranges from 3 to 3.5 obtained over 2 to 3 months. The second method is the multiple capture-recapture method (JOLLY, 1965; SEBER, 1965; MANLY, 1984). Il is an original tentative of applying...
Tipo: Text Palavras-chave: Tortue verte; Chelonia mydas; Reproduckion; Ponte; Population; Femelles; Marquage; Recapture; Océan Indien.; Marine green turtle; Chelonia mydas; Capture; Recapture; Indian Ocean; Nesting; Populations; Tagging; Reproduction.
Ano: 1986 URL: http://archimer.ifremer.fr/doc/00113/22406/20103.pdf
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