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1. Beta diversity of pelagic assemblages at fish aggregating devices in the open ocean

Author

Jan Robinson, Bastien Mérigot, Laurent Dagorn, Marc Taquet, M Koonjul, Adam, Paul D. Cowley, Frédéric Ménard, Y Rilwan, V Mangar, F Forget, Jean-Claude Gaertner, MARine Biodiversity Exploitation and Conservation (UMR MARBEC), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut de Recherche pour le Développement (IRD), Seychelles Fishing Authority (SFA) (SFA), Université des Seychelles, Institut de sciences exactes et appliquées (ISEA), Université de la Nouvelle-Calédonie (UNC), Institut de Planétologie et d'Astrophysique de Grenoble (IPAG), Centre National d'Études Spatiales [Toulouse] (CNES)-Observatoire des Sciences de l'Univers de Grenoble (OSUG ), Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Grenoble Alpes (UGA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Grenoble Alpes (UGA), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Ecosystèmes Insulaires Océaniens (UMR 241) (EIO), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de la Polynésie Française (UPF)-Institut Louis Malardé [Papeete] (ILM), Institut de Recherche pour le Développement (IRD), South African Institute for Aquatic Biodiversity (SAIAB), National Research Foundation [South Africa] (NRF), Institut méditerranéen d'océanologie (MIO), and Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS)

Subjects
0106 biological sciences, FADs, Ecology, 010604 marine biology & hydrobiology, species composition, [SDE.MCG]Environmental Sciences/Global Changes, pelagic fish diversity, Beta diversity, Pelagic zone, Aquatic Science, Seychelles, 010603 evolutionary biology, 01 natural sciences, Indian ocean, Geography, Maldives, Assemblage (archaeology), %22">Fish , Mauritius, underwater visual census, 14. Life underwater, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, human activities, Indian Ocean, Ecology, Evolution, Behavior and Systematics
Abstract

WOS:000558450600011; International audience; Owing to difficulties in accessing the vast open ocean, the beta (β) diversity of pelagic fish assemblages remains poorly studied. We investigated the relationship between assemblage similarity and geographical distance between anchored fish aggregating devices (FADs), sampled by standardised underwater visual censuses in three anchored FAD arrays in the Indian Ocean—at the Maldives, the Seychelles and Mauritius. The use of two complementary indices of β-diversity, based on presence/absence data (Jaccard similarity coefficient) and abundance data (Bray–Curtis index), revealed that geographical distance between sampling sites (from 4 to 257 km) appeared to have no effect on the similarity of fish assemblages associated with FADs within each array. The results of this preliminary study question the generalisation of the paradigm of an increase in β-diversity with geographic distance to the open-ocean fish community. Large-scale studies using a variety of datasets should be conducted to further investigate patterns of β-diversity in the open ocean.

Published
2020
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2. Non-Essential Trace Elements Dietary Exposure in French Polynesia: Intake Assessment, Nail Bio Monitoring and Thyroid Cancer Risk

Author

Solène Bernagout, Laurent Noël, Jacques Iltis, Eric Dewailly, John Paaoafaite, Eric Suhas, Axelle Leufroy, Frédérique Rachédi, Yen Ren, Marc Taquet, Florent de Vathaire, Monia Zidane, Frédérique Bost-Bezeaud, Jacques Gardon, Joseph Sebbag, Larrys Shan, Suzanne Côté, P. Bouisset, Carole Rubino, Patrice Petitdidier, Thierry Guérin, Constance Xhaard, Jean Louis Boissin, Biostatistique et Processus Spatiaux (BIOSP), Institut National de la Recherche Agronomique (INRA), Laboratoire de sécurité des aliments de Maisons-Alfort, Agence nationale de sécurité sanitaire de l'alimentation, de l'environnement et du travail (ANSES), Centre de recherche du Centre Hospitalier Universitaire de Québec, CHU Québec, Audencia Recherche, Audencia Business School, LESE Laboratoire d'Etude et de Suivi de l'Environnement, Institut de Radioprotection et de Sûreté Nucléaire (IRSN), Ecosystèmes Insulaires Océaniens (UMR 241) (EIO), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Louis Malardé [Papeete] (ILM), Institut de Recherche pour le Développement (IRD)-Université de la Polynésie Française (UPF), Laboratoire de Statistique Théorique et Appliquée (LSTA), Université Pierre et Marie Curie - Paris 6 (UPMC), Epidémiologie des cancers, Institut National de la Santé et de la Recherche Médicale (INSERM), Hydrosciences Montpellier (HSM), Institut de Recherche pour le Développement (IRD)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Epidémiologie des cancers : Radiocarcinogénèse et effets iatrogènes des traitements, Université Paris-Sud - Paris 11 (UP11)-Institut National de la Santé et de la Recherche Médicale (INSERM), Biostatistique et Processus Spatiaux (BioSP), Laboratoire de sécurité des aliments de Maisons-Alfort (LSAl), Université de la Polynésie Française (UPF)-Institut Louis Malardé [Papeete] (ILM), Institut de Recherche pour le Développement (IRD)-Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Hôpital de Taaone, Institut national des sciences de l'Univers (INSU - CNRS)-Institut de Recherche pour le Développement (IRD)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de la Polynésie Française (UPF)-Institut Louis Malardé [Papeete] (ILM), Institut de Recherche pour le Développement (IRD), and Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
0301 basic medicine, Male, control study, Physiology, fingernail, Dietary Exposure, 0302 clinical medicine, nETE, Risk Factors, Thyroid cancer, ComputingMilieux_MISCELLANEOUS, Dietary exposure, General Medicine, Middle Aged, Prognosis, 3. Good health, 030220 oncology & carcinogenesis, Bio-Monitoring, Population study, Female, case, Disease Susceptibility, Environmental Monitoring, Research Article, mercury, cadmium, case-control study, Food Contamination, Polynesia, 03 medical and health sciences, Young Adult, medicine, Humans, In patient, Thyroid Neoplasms, lead, business.industry, Case-control study, arsenic, medicine.disease, Trace Elements, 030104 developmental biology, Nails, Case-Control Studies, [SDV.SPEE]Life Sciences [q-bio]/Santé publique et épidémiologie, business, diet, Food contaminant, Intake assessment, Follow-Up Studies
Abstract

Background: In French Polynesia, thyroid cancer mortality and incidence is reported to be the highest in the world. Excessive levels of non-essential trace elements (nETE) in the body are associated with several types of cancer. Objective: The present study aims to provide quantitative information on food contamination by mercury (Hg), lead (Pb), arsenic (As) and cadmium (Cd) in French Polynesia and its potential correlation with measurements performed in fingernails of Polynesians, and then to investigate the potential association between these nETE and different thyroid cancer risks. Methods: The study population included 229 interviewed cases and 373 interviewed controls We performed a descriptive analysis of Polynesian food and examined the association between thyroid cancer risk and daily intake levels of nETE and with fingernail nETE levels. Results: Hg contamination was mainly present in sea products, Pb contamination was present in almost all samples, Cd was detectable in starchy food and As was detectable in all sea products. No patient exceeded dietary contamination WHO limits for Pb, 2 participants exceeded it for Hg and 3 individuals (0.5%) for cadmium. In fingernail clippings, the most detectable pollutant was Pb (553 participants), then Hg (543 participants) then Cd (only in 130 participants). Thyroid cancer risk was increased more than 4 times by Pb daily intake in patients with a history of cancer in first-degree relatives than in ones without (p for interaction =0.01), and 2 times more in women with more than 3 pregnancies than in those with none or less (p for interaction =0.005); it was also increased following As intake by more than 30% in patients with a history of cancer in first-degree relatives than in ones without (p for interaction =0.05). Conclusion: Locally produced foods are not a source of nETE exposure in French Polynesia. Dieatry nETE exposure and fingernail nETE concentration are not associated to differentiated thyroid cancer risk. No correlation found between nETE dietary exposure and fingernail nETE concentration.

Published
2019
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3. Behavior and Food Consumption Pattern of the French Polynesian Population in the 1960s –1970s

Author

Vladimir Drozdovitch, Yan Ren, Jacques Gardon, Tetuaura Tetuanui, Florent de Vathaire, Constance Xhaard, Marc Taquet, Françoise Doyon, André Bouville, National Cancer Institute [Bethesda] (NCI-NIH), National Institutes of Health [Bethesda] (NIH), Ecosystèmes Insulaires Océaniens (UMR 241) (EIO), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de la Polynésie Française (UPF)-Institut Louis Malardé [Papeete] (ILM), Institut de Recherche pour le Développement (IRD), Hydrosciences Montpellier (HSM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Centre de recherche en épidémiologie et santé des populations (CESP), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Paris-Sud - Paris 11 (UP11)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Hôpital Paul Brousse-Institut National de la Santé et de la Recherche Médicale (INSERM), Centre d'investigation clinique [Nancy] (CIC), Centre Hospitalier Régional Universitaire de Nancy (CHRU Nancy)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Lorraine (UL), Institut Gustave Roussy (IGR), Défaillance Cardiovasculaire Aiguë et Chronique (DCAC), Université Paris-Saclay, Université de la Polynésie Française (UPF)-Institut Louis Malardé [Papeete] (ILM), Institut de Recherche pour le Développement (IRD)-Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Institut national des sciences de l'Univers (INSU - CNRS)-Institut de Recherche pour le Développement (IRD)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Université Paris-Sud - Paris 11 (UP11)-Hôpital Paul Brousse-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Université de Lorraine (UL)-Centre Hospitalier Régional Universitaire de Nancy (CHRU Nancy)-Institut National de la Santé et de la Recherche Médicale (INSERM), and Gardon, Jacques

Subjects
Male, Radioactive Fallout, 0301 basic medicine, Neoplasms, Radiation-Induced, common, Breastfeeding, French Polynesia, Iodine Radioisotopes, 0302 clinical medicine, Risk analysis (business), Activities of Daily Living, Child, Nuclear Weapons, education.field_of_study, atmospheric nuclear weapons test, COUTUME ALIMENTAIRE, General Medicine, Focus Groups, ENQUETE NUTRITIONNELLE, MILIEU INSULAIRE, CANCER, Breast Feeding, Geography, ENFANT, Key informants, Child, Preschool, 030220 oncology & carcinogenesis, common.group, food consumption, Female, Research Article, RADIOACTIVITE, Adolescent, Population, Food consumption, Nuclear weapon, Radiation Dosage, Risk Assessment, Polynesia, CONSOMMATION ALIMENTAIRE, Food Preferences, Young Adult, 03 medical and health sciences, Polynesians, Environmental health, Humans, Thyroid Neoplasms, education, Life Style, behavior, Infant, Newborn, Infant, ALLAITEMENT MATERNEL, Environmental Exposure, Focus group, radiation, [SDV.AEN] Life Sciences [q-bio]/Food and Nutrition, 030104 developmental biology, [SDV.SPEE] Life Sciences [q-bio]/Santé publique et épidémiologie, Case-Control Studies, [SDV.SPEE]Life Sciences [q-bio]/Santé publique et épidémiologie, [SDV.AEN]Life Sciences [q-bio]/Food and Nutrition
Abstract

International audience; Background. Reconstruction of radiation doses to the thyroid for a case-control study of thyroid cancer in French Polynesians exposed to radioactive fallout from atmospheric nuclear weapons tests during childhood and adolescence faced a major limitation on very little availability of information on lifestyle of French Polynesians in the 1960s–1970s.Method: We use the focus group discussion and key informant interview methodology to collect historical, for the 1960s–1970s, data on behavior and food consumption for French Polynesia population exposed to radioactive fallout from nuclear weapons tests conducted between 1966 and 1974.Results. We obtained archipelago-specific data on food consumptions by children of different ages and by pregnant and lactating women during pregnancy and breastfeeding and behaviour, including time spent outdoors and type and construction materials of residences.Conclusions. This article presents the first detailed information on several key aspects of daily life on French Polynesian archipelagoes during the 1960s–1970s impacting radiation exposure. Important behavior and food consumptions data obtained in this study are being used to improve the radiation dose estimates and to update the risk analysis reported earlier by correcting biases from previous assumptions and by providing better estimates of the parameter values important to radiation dose assessment.

Published
2019
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4. Visual censuses around drifting fish aggregating devices (FADs) : a new approach for assessing the diversity of fish in open-ocean waters

Author

Jean-Claude Gaertner, David Itano, Marc Taquet, Bastien Mérigot, Laurent Dagorn, Gorka Sancho, Riaz Aumeeruddy, Laboratoire de MicrobiologiE de Géochimie et d'Ecologie Marines ( LMGEM ), Centre National de la Recherche Scientifique ( CNRS ) -Université de la Méditerranée - Aix-Marseille 2, IFREMER ( CRH ), Institut Français de Recherche pour l'Exploitation de la Mer ( IFREMER ), Thons tropicaux et écosystèmes pélagiques : taxies, interactions et stratégies d'exploitation ( THETIS ), Seychelles Fishing Authority, Fishing Autority, College of Charleston, Pelagic Fisheries Research Program ( JIMAR ), University of Hawaii, Laboratoire de MicrobiologiE de Géochimie et d'Ecologie Marines (LMGEM), Université de la Méditerranée - Aix-Marseille 2-Centre National de la Recherche Scientifique (CNRS), Centre de Recherche Halieutique Méditerranéenne et Tropicale (CRH), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Thons tropicaux et écosystèmes pélagiques : taxies, interactions et stratégies d'exploitation (THETIS), Pelagic Fisheries Research Program (JIMAR), Centre National de la Recherche Scientifique (CNRS)-Université de la Méditerranée - Aix-Marseille 2, and IFREMER (CRH)

Subjects
0106 biological sciences, [ SDU.OCEAN ] Sciences of the Universe [physics]/Ocean, Atmosphere, Aquatic Science, Biology, 010603 evolutionary biology, 01 natural sciences, Diversity index, Survey methodology, Drifting fads, 14. Life underwater, Indian Ocean, Ecology, Evolution, Behavior and Systematics, ComputingMilieux_MISCELLANEOUS, [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, Diversity, Drifting FADs, Ecology, 010604 marine biology & hydrobiology, Species diversity, Pelagic zone, Pelagic fishes, Fishery, Species evenness, Indian ocean, Species richness, Diversity (business), Global biodiversity
Abstract

This study provides a baseline measure of pelagic fish species diversity around fish aggregating devices (FADs) in the Western Indian Ocean. Using data from visual censuses made by SCUBA divers around drifting FADs we (1) analysed 11 diversity indices describing 4 main compo- nents of pelagic diversity: number of species, evenness, taxonomic diversity and rarity and (2) dis- cussed the viability of using visual censuses around FADs to monitor temporal and spatial changes in diversity patterns of pelagic fishes in the future. Our results not only show that a single index, such as species richness or the Shannon-Wiener index, cannot provide a complete description of pelagic fish diversity around FADs, but also that some components of diversity appear to be multifaceted themselves and require the simultaneous use of several complementary indices in order to be accu- rately described and monitored. Despite a limited sampling effort, our results suggest that using visual censuses around FADs could provide reproducible 'relative' indices of diversity for a well- delimited assemblage of species (intra- and extranatant species in the epipelagic domain). In this con- text, we propose a preliminary 'short list' of diversity indices based firstly on their complementarity and secondly on their simplicity. While visual censuses of pelagic fishes at FADs (like any other sam- pling method) cannot give an exhaustive picture of diversity, they are a fishery-independent survey method that can complement other sampling techniques and provide reproducible information to monitor the diversity of these very difficult-to-access pelagic fish communities.

Published
2008
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5. Characterizing fish communities associated with drifting fish aggregating devices (FADs) in the Western Indian Ocean using underwater visual surveys

Author

Riaz Aumeeruddy, Christophe Peignon, Gorka Sancho, David Itano, Bertrand Wendling, Marc Taquet, Jean-Claude Gaertner, Laurent Dagorn, IFREMER ( CRH ), Institut Français de Recherche pour l'Exploitation de la Mer ( IFREMER ), College of Charleston, Thons tropicaux et écosystèmes pélagiques : taxies, interactions et stratégies d'exploitation ( THETIS ), Laboratoire de MicrobiologiE de Géochimie et d'Ecologie Marines ( LMGEM ), Centre National de la Recherche Scientifique ( CNRS ) -Université de la Méditerranée - Aix-Marseille 2, Pelagic Fisheries Research Program ( JIMAR ), University of Hawaii, Seychelles Fishing Authority, Fishing Autority, IRD, Centre de Recherche Halieutique Méditerranéenne et Tropicale (CRH), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Thons tropicaux et écosystèmes pélagiques : taxies, interactions et stratégies d'exploitation (THETIS), Laboratoire de MicrobiologiE de Géochimie et d'Ecologie Marines (LMGEM), Université de la Méditerranée - Aix-Marseille 2-Centre National de la Recherche Scientifique (CNRS), Pelagic Fisheries Research Program (JIMAR), IFREMER (CRH), and Centre National de la Recherche Scientifique (CNRS)-Université de la Méditerranée - Aix-Marseille 2

Subjects
0106 biological sciences, [ SDU.OCEAN ] Sciences of the Universe [physics]/Ocean, Atmosphere, Coral reef fish, Triggerfish, Aquatic Science, reunion Island, Seychelles, 010603 evolutionary biology, 01 natural sciences, Visual census, Common species, 14. Life underwater, Indian Ocean, [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, Coryphaena, biology, Ecology, 010604 marine biology & hydrobiology, Pelagic zone, Pelagic fishes, biology.organism_classification, Drifting FAD, Canthidermis, Fishery, Reunion Island, Carcharhinus, Fish aggegations, Tuna, Fish aggregations
Abstract

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 species like Kyphosus vaigiensis, Canthidermis maculata, Elagatis bipinnulata, Acanthocybium solandri and Coryphaena hippurus were observed on all or most of the surveys. In this study, the contribution in biomass of the 18 common species associated with drifting FADs (but excluding circumnatant species), represents more than 98% of the biomass. The overall biomass values of closely associated species remains well below tuna biomass estimates for circumnatant tuna schools at FADs, estimated as high as 200 tons. The species that most significantly contribute to the by-catch in tuna purse-seines logically match those that showing the highest biomass values in our surveys (Carcharhinus spp., Elagatis bipinnulata, Coryphaena hippurus, Canthidermis maculata, and Acanthocybium solandri). One of the most abundant and ubiquitous species in our study was the spotted oceanic triggerfish Canthidermis maculata that sometimes formed massive schools of many thousands individuals around the drifting FADs. Future research is needed to explore the role of such non tuna species in the attraction and aggregation processes of tuna around drifting FADs.

Published
2008
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6. Behavior of dolphinfish (Coryphaena hippurus) around drifting FADs as observed from automated acoustic receivers

Author

Gorka Sancho, Laurent Dagorn, Charlotte Girard, Marc Taquet, Jean-Claude Gaertner, Riaz Aumerruddy, David Itano, Centre de Recherche Halieutique Méditerranéenne et Tropicale (CRH), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Thons tropicaux et écosystèmes pélagiques : taxies, interactions et stratégies d'exploitation (THETIS), Laboratoire de MicrobiologiE de Géochimie et d'Ecologie Marines (LMGEM), Université de la Méditerranée - Aix-Marseille 2-Centre National de la Recherche Scientifique (CNRS), Seychelles Fishing Authority, Fishing Autority, College of Charleston, Pelagic Fisheries Research Program (JIMAR), University of Hawaii, IFREMER (CRH), Centre National de la Recherche Scientifique (CNRS)-Université de la Méditerranée - Aix-Marseille 2, IFREMER ( CRH ), Institut Français de Recherche pour l'Exploitation de la Mer ( IFREMER ), Thons tropicaux et écosystèmes pélagiques : taxies, interactions et stratégies d'exploitation ( THETIS ), Laboratoire de MicrobiologiE de Géochimie et d'Ecologie Marines ( LMGEM ), Centre National de la Recherche Scientifique ( CNRS ) -Université de la Méditerranée - Aix-Marseille 2, and Pelagic Fisheries Research Program ( JIMAR )

Subjects
0106 biological sciences, [ SDU.OCEAN ] Sciences of the Universe [physics]/Ocean, Atmosphere, Ultrasonic telemetry, Behavoir of fish, Aquatic Science, Biology, 010603 evolutionary biology, 01 natural sciences, Dolphinfish, Range finding, Meeting point, Utrasonic telemetry, 14. Life underwater, Ecological trap, Indian Ocean, [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, Coryphaena, Behavior of fish, Ecology, FAD, Acoustic tagging, 010604 marine biology & hydrobiology, Significant difference, biology.organism_classification, Fishery, Indian ocean, Coryphaenidae, Aquatic environment, %22">Fish
Abstract

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 dolphinfish in equatorial and tropical areas. While associated to FADs, dolphinfish spent most of their time close to floating object (< 365 m). The total time spent away from FADs was low (median 8%), and likely corresponded to making feeding excursions. Dolphinfish did not form a single school while associated to a given FADs, but formed multiple small schools. FADs are likely to be sites with exchanges of individuals between schools. These results are discussed in regards to the possibility of FADs acting as ecological traps and the validity of meeting-point hypotheses as an explanation for fish aggregations under floating objects.

Published
2008
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