| |
Enregistrements |
Liens |
|
Auteur |
Govinden, R.; Jauhary, R.; Filmalter, J.; Forget, F.; Soria, M.; Adam, S.; Dagorn, L. |
|
| |
Titre |
Movement Behaviour of Skipjack (Katsuwonus Pelamis) and Yellowfin (Thunnus Albacares) Tuna at Anchored Fish Aggregating Devices (FADs) in the Maldives, Investigated by Acoustic Telemetry |
Type |
Article scientifique |
| |
Année |
2012 |
Publication |
|
Revue Abrégée |
Aquatic Living Resources |
|
| |
Volume |
FirstView |
Numéro |
|
Pages |
|
|
| |
Mots-Clés |
Behaviour; Fish Aggregating Devices; Indian Ocean; Passive acoustic telemetry; skipjack tuna; Yellowfin tuna |
|
| |
Résumé |
|
|
| |
Adresse |
|
|
| |
Auteur institutionnel |
|
Thèse |
|
|
| |
Editeur |
|
Lieu de Publication |
|
Éditeur |
|
|
| |
Langue |
|
Langue du Résumé |
|
Titre Original |
|
|
| |
Éditeur de collection |
|
Titre de collection |
|
Titre de collection Abrégé  |
|
|
| |
Volume de collection |
|
Numéro de collection |
|
Edition |
|
|
| |
ISSN |
|
ISBN |
|
Médium |
|
|
| |
Région |
|
Expédition |
|
Conférence |
|
|
| |
Notes |
|
Approuvé |
pas de |
|
| |
Numéro d'Appel |
LL @ pixluser @ |
collection |
193 |
|
| Lien permanent pour cet enregistrement |
| |
|
| |
|
Auteur |
DRUON, J.-N.; FROMENTIN, J.-M.; AULANIER, F.; HEIKKONEN, J. |
|
| |
Titre |
Potential feeding and spawning habitats of Atlantic bluefin tuna in the Mediterranean Sea |
Type |
Article scientifique |
| |
Année |
2011 |
Publication |
Marine Ecology-progress Series |
Revue Abrégée |
|
|
| |
Volume |
439 |
Numéro |
|
Pages |
223-240 |
|
| |
Mots-Clés |
Habitat mapping; Bluefin tuna; Thunnus thynnus; Feeding; Spawning; Mediterranean Sea; Remote sensing; Satellite data |
|
| |
Résumé |
Atlantic bluefin tuna Thunnus thynnus (ABFT) is a fish of high market value which has recently become strongly overexploited, notably in the Mediterranean Sea. This area is an essential habitat for ABFT reproduction and growth. We present here an approach for deriving the daily mapping of potential ABFT feeding and spawning habitats based on satellite-derived sea surface temperature (SST) and chl a concentration. The feeding habitat was mainly derived from the simultaneous occurrence of oceanic fronts of temperature and chl a content while the spawning habitat was mostly inferred from the heating of surface waters. Generally, higher chl a contents were found to be preferred for the feeding habitat and a minimum SST value was found for the spawning habitat. Both habitats were defined by the presence of relevant oceanographic features and are therefore potential and functionally-linked habitats. This approach provides, for the first time, a synoptic view of the potential ABFT habitats in the Mediterranean Sea. The model performs well in areas where both satellite data and ABFT observations are available, as 80% of presence data are in the vicinity of potential habitats. The computed monthly, seasonal and annual maps of potential feeding and spawning habitat of ABFT from 2003 to 2009 are in good agreement with current knowledge on ABFT. Overall, the habitat size of ABFT is about 6% of the Mediterranean Sea surface. The results displayed a strong seasonality in habitat size and locations as well as high year-to-year variations (30 to 60%), particularly for the potential spawning habitat, which is key information for evaluating the utility of ABFT Marine Protected Areas in the Mediterranean Sea. |
|
| |
Adresse |
IFREMER, Ctr Rech Halieut Mediterraneen & Trop, F-34203 Sete, France. |
|
| |
Auteur institutionnel |
|
Thèse |
|
|
| |
Editeur |
Inter-research |
Lieu de Publication |
|
Éditeur |
|
|
| |
Langue |
|
Langue du Résumé |
|
Titre Original |
|
|
| |
Éditeur de collection |
|
Titre de collection |
|
Titre de collection Abrégé |
|
|
| |
Volume de collection |
|
Numéro de collection |
|
Edition |
|
|
| |
ISSN |
0171-8630 |
ISBN |
|
Médium |
|
|
| |
Région |
|
Expédition |
|
Conférence |
|
|
| |
Notes |
|
Approuvé |
pas de |
|
| |
Numéro d'Appel |
MARBEC @ isabelle.vidal-ayouba @ 16053 |
collection |
1003 |
|
| Lien permanent pour cet enregistrement |
| |
|
| |
|
Auteur |
Nikolic, N.; Jérôme, M.; Fonteneau, A.; Evano, H.; Verrez-Bagnis, V. |
|
| |
Titre |
Identification of skipjack tuna juveniles based on DNA control region sequences and potential spawning area around reunion island |
Type |
Article scientifique |
| |
Année |
2016 |
Publication |
|
Revue Abrégée |
Environmental Biology of Fishes |
|
| |
Volume |
99 |
Numéro |
2 |
Pages |
171-178 |
|
| |
Mots-Clés |
Age; dna; juvenile; Reunion island; skipjack tuna |
|
| |
Résumé |
In this study, we confirmed that DNA control region can be used to identify potential spawning area from pelagic juveniles species. We used the mitochondrial DNA control region to identify tuna juveniles predated by common dolphinfish and sampled in surface waters around Reunion Island. These were skipjack juveniles at an early stage (small length and young age). The biological results confirmed the species identification based on DNA analysis. Catch data by longline reveal a higher number of skipjack from October to December around Reunion Island corresponding to the period of our skipjack juvenile sampling |
|
| |
Adresse |
|
|
| |
Auteur institutionnel |
|
Thèse |
|
|
| |
Editeur |
|
Lieu de Publication |
|
Éditeur |
|
|
| |
Langue |
|
Langue du Résumé |
|
Titre Original |
|
|
| |
Éditeur de collection |
|
Titre de collection |
|
Titre de collection Abrégé |
|
|
| |
Volume de collection |
|
Numéro de collection |
|
Edition |
|
|
| |
ISSN |
0378-1909 |
ISBN |
|
Médium |
|
|
| |
Région |
|
Expédition |
|
Conférence |
|
|
| |
Notes |
|
Approuvé |
pas de |
|
| |
Numéro d'Appel |
MARBEC @ isabelle.vidal-ayouba @ |
collection |
1518 |
|
| Lien permanent pour cet enregistrement |
| |
|
| |
|
Auteur |
Robert, M.; Dagorn, L.; Lopez, J.; Moreno, G.; Deneubourg, J.L. |
|
| |
Titre |
Does social behavior influence the dynamics of aggregations formed by tropical tunas around floating objects ? An experimental approach |
Type |
Article scientifique |
| |
Année |
2013 |
Publication |
|
Revue Abrégée |
Journal of Experimental Marine Biology and Ecology |
|
| |
Volume |
440 |
Numéro |
|
Pages |
238-243 |
|
| |
Mots-Clés |
Aggregation; Binary choice; FADs; Social behavior; tuna |
|
| |
Résumé |
Tropical tunas associate with objects floating at the surface of the ocean, a behavior widely exploited by fishers. However, the respective roles played by environmental variables and behavioral processes (e.g., social behavior) in the formation of these aggregations remain elusive. To investigate the role of social behavior in the dynamics of such aggregations, we used the binary choice approach. The experimental design comprised two close and identical anchored fish aggregating devices (FADS) equipped with an echo sounder buoy to monitor the aggregated biomass of tuna under each device. Analysis of the results entailed characterizing whether the aggregated biomass is distributed asymmetrically (indicative of social behavior playing a role in the dynamics) or symmetrically between the two close and identical FADs, and comparing the results with theoretical distributions based on different definitions of basic units (individual fish or small schools). The results suggest that social interactions underlie aggregation processes, which represents a major advance in our understanding of these aggregations, a priority for science-based fishery management. While recognizing the logistical and technical constraints, we encourage the development of experimental studies (e.g., in which animals are presented with controlled situations) to enhance our understanding of the behavior of large pelagic fish. |
|
| |
Adresse |
|
|
| |
Auteur institutionnel |
|
Thèse |
|
|
| |
Editeur |
|
Lieu de Publication |
|
Éditeur |
|
|
| |
Langue |
|
Langue du Résumé |
|
Titre Original |
|
|
| |
Éditeur de collection |
|
Titre de collection |
|
Titre de collection Abrégé |
|
|
| |
Volume de collection |
|
Numéro de collection |
|
Edition |
|
|
| |
ISSN |
0022-0981 |
ISBN |
|
Médium |
|
|
| |
Région |
|
Expédition |
|
Conférence |
|
|
| |
Notes |
|
Approuvé |
pas de |
|
| |
Numéro d'Appel |
LL @ pixluser @ |
collection |
249 |
|
| Lien permanent pour cet enregistrement |
| |
|
| |
|
Auteur |
Baidai, Y.; Dagorn, L.; Amande, M.J.; Gaertner, D.; Capello, M. |
|
| |
Titre |
Machine learning for characterizing tropical tuna aggregations under Drifting Fish Aggregating Devices (DFADs) from commercial echosounder buoys data |
Type |
Article scientifique |
| |
Année |
2020 |
Publication |
|
Revue Abrégée |
Fish Res. |
|
| |
Volume |
229 |
Numéro |
|
Pages |
105613 |
|
| |
Mots-Clés |
behavior; classification; communities; Direct abundance indicator; echo-sounder buoys; Echosounder buoys; estimate biomass; fads; Fish aggregating devices; Purse seiner; purse seiners; target strength; temperature; Tropical tunas; yellowfin thunnus-albacares |
|
| |
Résumé |
The use of echosounder buoys deployed in conjunction with Drifting Fish Aggregating Devices (DFADs) has progressively increased in the tropical tuna purse seine fishery since 2010 as a means of improving fishing efficiency. Given the broad distribution of DFADs, the acoustic data provided by echosounder buoys can provide an alternative to the conventional CPUE index for deriving trends on tropical tuna stocks. This study aims to derive reliable indices of presence of tunas (and abundance) using echosounder buoy data. A novel methodology is presented which utilizes random forest classification to translate the acoustic backscatter from the buoys into metrics of tuna presence and abundance. Training datasets were constructed by cross-referencing acoustic data with logbook and observer data which reported activities on DFADs (tuna catches, new deployments and visits of DFADs) in the Atlantic and Indian Oceans from 2013 to 2018. The analysis showed accuracies of 75 and 85 % for the recognition of the presence/absence of tuna aggregations under DFADs in the Atlantic and Indian Oceans, respectively. The acoustic data recorded at ocean-specific depths (6-45m in the Atlantic and 30-150m in the Indian Ocean) and periods (4 a.m.-4 p.m.) were identified by the algorithm as the most important explanatory variables for detecting the presence of tuna. The classification of size categories of tuna aggregations showed a global accuracy of nearly 50 % for both oceans. This study constitutes a milestone towards the use of echosounder buoys data for scientific purposes, including the development of promising fisheries-independent indices of abundance for tropical tunas. |
|
| |
Adresse |
|
|
| |
Auteur institutionnel |
|
Thèse |
|
|
| |
Editeur |
|
Lieu de Publication |
|
Éditeur |
|
|
| |
Langue |
English |
Langue du Résumé |
|
Titre Original |
|
|
| |
Éditeur de collection |
|
Titre de collection |
|
Titre de collection Abrégé |
|
|
| |
Volume de collection |
|
Numéro de collection |
|
Edition |
|
|
| |
ISSN |
0165-7836 |
ISBN |
|
Médium |
|
|
| |
Région |
|
Expédition |
|
Conférence |
|
|
| |
Notes |
WOS:000539099200018 |
Approuvé |
pas de |
|
| |
Numéro d'Appel |
MARBEC @ isabelle.vidal-ayouba @ |
collection |
2816 |
|
| Lien permanent pour cet enregistrement |
