Article
Fisheries
John D. Filmalter, Robert K. Bauer, Fabien Forget, Paul D. Cowley, Laurent Dagorn
Summary: The study found that silky sharks have high overlap with FADs and fishing vessel positions, highlighting the need for compliance with FAD design regulations to prevent entanglement, while the overlap with tuna catches is more variable. The observed movement patterns suggest that static spatial management measures may have limited conservation impact, whereas dynamic approaches may be more suitable.
ICES JOURNAL OF MARINE SCIENCE
(2021)
Article
Oceanography
Fabien Forget, Jeff Muir, Melanie Hutchinson, David Itano, Igor Sancristobal, Bruno Leroy, John Filmalter, Udane Martinez, Kim Holland, Victor Restrepo, Laurent Dagorn
Summary: Estimating bycatch is crucial for monitoring fisheries' ecological impacts. The study found that shark counts were often underestimated during commercial fishing trips, especially by single onboard observers or Electronic Monitoring Systems. Specific studies using complementary counts by two onboard observers are recommended to assess the accuracy of different EMS configurations.
OCEAN & COASTAL MANAGEMENT
(2021)
Article
Ecology
Karine Briand, Philippe S. Sabarros, Alexandra Maufroy, Anne-Lise Vernet, Arthur Yon, Antoine Bonnieux, Michel Goujon, Pascal Bach
Summary: This study used Electronic Monitoring Systems (EMS) installed on board French tropical tuna purse seiners to examine the sorting process and optimize observer sampling strategies for obtaining robust estimates of discards. The results showed differences in the flow of discards among species and sorting locations and recommended specific observer sampling strategies for accurate discard estimation. The study also discussed strategies to improve discard estimation combining onboard and electronic observations.
REGIONAL STUDIES IN MARINE SCIENCE
(2023)
Article
Environmental Sciences
Signe Christensen-Dalsgaard, Bjornar Ytrenus, Magdalene Langset, Jorgen Ree Wiig, Kim Magnus Baerum
Summary: Beachcast events, where a large number of seabird carcasses drift ashore, occur irregularly. A study in northern Norway investigated the cause of death in dead gulls found after mass mortality events, and found that drowning was the primary cause. Monitoring fishing operations revealed that bycatch in coastal purse seine fishery may be a potential cause of seabird mortality.
MARINE ENVIRONMENTAL RESEARCH
(2022)
Article
Ecology
Pauline Stephan, Daniel Gaertner, Ilan Perez, Lorelei Guery
Summary: This article introduces a method that combines self-organizing maps (SOMs) with a clustering approach to analyze fisheries data. By converting the data into simple geographic maps showing catch hotspots, the method can indicate sensitive areas in fishery management. Testing on simulated and real datasets demonstrates that this method provides scientific support and aids in decision-making for fisheries management.
METHODS IN ECOLOGY AND EVOLUTION
(2022)
Article
Environmental Sciences
Jefferson Murua, Gala Moreno, Laurent Dagorn, David Itano, Martin Hall, Hilario Murua, Victor Restrepo
Summary: More than a decade of collaborative efforts with tropical tuna purse seine fleets has resulted in the development of sustainable fishing practices worldwide. Through participatory workshops organized by the ISSF, scientists, fishers, and stakeholders have worked together to minimize fishery impacts. These workshops have reached fleet members in 23 countries, and the discussions have led to novel solutions and a better understanding of ecosystem dynamics. The testing and adoption of these solutions, as well as the increased trust and stewardship of fishers, have contributed to large-scale research projects and the adoption of best practices for impact mitigation.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Engineering, Marine
Qinglian Hou, Cheng Zhou, Rong Wan, Junbo Zhang, Feng Xue
Summary: The study presented a tuna fish school recognition system that utilizes feature point extraction and matching. By combining the best feature point algorithms with the k-nearest neighbors algorithm, the system successfully achieves accurate recognition of free-swimming tuna fish schools.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Fisheries
Cleridy E. Lennert-Cody, Jon Lopez, Mark N. Maunder
Summary: The study developed annual set type classification algorithms for the tropical tuna purse-seine fishery in the eastern Pacific Ocean using random forests. The results showed that different set types can be reliably distinguished based on operational characteristics and catch and bycatch information. The algorithms had low misclassification error rates and could be used to validate set type determinations based on other criteria.
FISHERIES RESEARCH
(2023)
Article
Biodiversity Conservation
Taha Imzilen, Christophe Lett, Emmanuel Chassot, David M. Kaplan
Summary: The study analyzed dFAD trajectories in the Indian Ocean and Atlantic Ocean, finding that prohibiting deployments in specific areas can significantly reduce dFAD beaching events. The riskiest areas for beaching are not necessarily where dFAD deployment is highest, suggesting closures could have minimal impact on fisheries.
BIOLOGICAL CONSERVATION
(2021)
Article
Fisheries
Eric Diaz-Delgado, Osman Crespo-Neto, Raul O. Martinez-Rincon
Summary: The study used Generalized Additive Models to describe the environmental preferences and spatiotemporal distribution of most bycaught shark species in the Eastern Pacific Ocean. Different shark species were found to be bycaught in different water and productivity environments. The results identified hotspots where fisheries management could be implemented, improved, or modified to reduce shark bycatch.
FISHERIES RESEARCH
(2021)
Article
Fisheries
Anildo Nataniel, Jon Lopez, Maria Soto
Summary: This study investigated the environmental preferences and biomass aggregation patterns of tropical tuna from purse seine fishery in the Mozambique Channel (MZC). Using Spanish fishing logbook data, the study found that oceanographic, temporal, and spatial factors have different effects on tuna biomass accumulation in different fishing modes, but there are some commonalities in the area and period of study.
FISHERIES RESEARCH
(2021)
Article
Fisheries
Oihane C. Basurko, Gorka Gabina, Jon Lopez, Igor Granado, Hilario Murua, Jose A. Fernandes, Inigo Krug, Jon Ruiz, Zigor Uriondo
Summary: Different fishing strategies in tropical tuna purse seiners fleet, including FAD and FSC, have different carbon footprints. A study monitored energy consumption of a Spanish tuna purse seiner in the Indian Ocean and analyzed fuel use intensity of FAD vs. FSC fishing. FAD fishing is more fuel intensive but has higher success rates compared to FSC fishing.
FISHERIES RESEARCH
(2022)
Article
Environmental Studies
Lauriane Escalle, Jennyfer Mourot, Paul Hamer, Steven R. Hare, Naiten Bradley Phillip, Graham M. Pilling
Summary: Drifting Fish Aggregating Devices (dFAD) are commonly used in purse seine tuna fisheries globally. This study investigated the materials and designs used in dFAD construction over the past 10 years in the Western and Central Pacific Ocean (WCPO) using data collected by fishery observers. The results showed that natural materials are rarely used, except for bamboo in dFAD rafts for buoyancy. Most dFADs incorporate netting of various mesh sizes in their construction. Efforts are being made to transition towards more environmentally friendly dFAD designs, including the use of biodegradable materials.
Article
Fisheries
Osman Crespo-Neto, Eric Diaz-Delgado, Tatiana A. Acosta-Pachon, Raul O. Martinez-Rincon
Summary: The research highlights the influence of environmental conditions on the size distribution of billfish species, indicating a clear segregation driven by size and environmental preferences in the eastern Pacific Ocean.
FISHERIES RESEARCH
(2021)
Article
Fisheries
Nelly Pena-Cutimbo, Cristel Cordero-Maldonado, Clara Ortiz-Alvarez, Joanna Alfaro-Shigueto, Jeffrey C. Mangel
Summary: Bycatch is a global problem for marine megafauna. This study assessed the bycatch interactions of the Peruvian artisanal purse-seine fishery in 2019 and found that all taxa groups were affected by bycatch. Dusky dolphins, guanay cormorants, and eagle rays were the most frequently reported bycatch species.
FISHERIES RESEARCH
(2024)
Correction
Biodiversity Conservation
Laura Mannocci, Fabien Forget, Mariana Travassos Tolotti, Pascal Bach, Nicolas Bez, Herve Demarcq, David Kaplan, Philippe S. Sabarros, Monique Simier, Manuela Capello, Laurent Dagorn
GLOBAL ECOLOGY AND CONSERVATION
(2021)
Article
Biodiversity Conservation
Taha Imzilen, Christophe Lett, Emmanuel Chassot, David M. Kaplan
Summary: The study analyzed dFAD trajectories in the Indian Ocean and Atlantic Ocean, finding that prohibiting deployments in specific areas can significantly reduce dFAD beaching events. The riskiest areas for beaching are not necessarily where dFAD deployment is highest, suggesting closures could have minimal impact on fisheries.
BIOLOGICAL CONSERVATION
(2021)
Article
Environmental Sciences
Emmanuel Chassot, Sharif Antoine, Patrice Guillotreau, Juliette Lucas, Cindy Assan, Michel Marguerite, Nathalie Bodin
Summary: The study found that the energetic performance of the Indian Ocean purse seine fishery exhibits strong interannual variability, mainly influenced by tuna abundance, catchability, and fishing strategy. In recent years, increased targeting of fish aggregating devices and changes in management measures have significantly altered the productivity and spatio-temporal patterns of purse seine fishing.
ENVIRONMENTAL POLLUTION
(2021)
Article
Fisheries
Rocio Joo, Nicolas Bez, Marie-Pierre Etienne, Pablo Marin, Nicolas Goascoz, Jerome Roux, Stephanie Mahevas
Summary: This study identifies partnerships at sea among different fleets through fishing track analysis, finding that collaboration between vessels exists in various fisheries except for tuna purse-seiners. The analysis reveals exclusive partnerships between vessels, with pelagic pair trawlers and small bottom otter trawlers showing higher rates of exclusivity. This work demonstrates collective tactics at a pairwise level in diverse fisheries around the world.
ICES JOURNAL OF MARINE SCIENCE
(2021)
Article
Marine & Freshwater Biology
Thibault Cariou, Laurent Dubroca, Camille Vogel, Nicolas Bez
Summary: The study revealed that juvenile sole, dab, and plaice in the Seine estuary nursery grounds exhibit different spatial distribution preferences; analysis showed that their average positions remained stable over the past two decades, without significant changes related to the major stress of harbor development during 2000-2005.
ESTUARINE COASTAL AND SHELF SCIENCE
(2021)
Article
Chemistry, Applied
Nathalie Bodin, Aurelien Amiel, Edwin Fouche, Fany Sardenne, Emmanuel Chassot, Laurent Debrauwer, Herve Guillou, Marie Tremblay-Franco, Cecile Canlet
Summary: High-resolution proton nuclear magnetic resonance combined with multivariate data analysis can efficiently discriminate specific metabolic profiles among wild tuna species, raw muscle tissues, fish storage conditions, and tuna geographical origin.
Article
Green & Sustainable Science & Technology
Haoran Pan, Pierre Failler, Qianyi Du, Christos Floros, Loretta Malvarosa, Emmanuel Chassot, Vincenzo Placenti
Summary: This paper presents an inter-temporal computable general equilibrium model with fisheries details, which provides a comprehensive tool for analyzing fisheries policy and management. The model describes the structure and dynamics of regional fisheries economy and considers the interactions between different economic sectors.
Article
Green & Sustainable Science & Technology
Taha Imzilen, Christophe Lett, Emmanuel Chassot, Alexandra Maufroy, Michel Goujon, David M. Kaplan
Summary: Tropical tuna purse-seine fishing vessels contribute to the problem of abandoned, lost or discarded fishing equipment by deploying large numbers of drifting Fish Aggregating Devices (dFADs). Research findings show that over 40% of these devices ultimately drift away from fishing grounds, with about 20% passing major ports. The study also identifies specific areas within the fishing grounds where most devices exit.
NATURE SUSTAINABILITY
(2022)
Article
Multidisciplinary Sciences
Julie Salvetat, Nicolas Bez, Jeremie Habasque, Anne Lebourges-Dhaussy, Cristiano Lopes, Gildas Roudaut, Monique Simier, Paulo Travassos, Gary Vargas, Arnaud Bertrand
Summary: This study provides a comprehensive description of fish distribution in a tropical marine environment using acoustics and video observations. The research identifies the relationship between different fish species' spatial patterns and environmental factors and protection levels. The study also estimates the biomass of the black triggerfish and reveals the spatial asymmetry of fish distribution between euphotic and mesophotic reefs.
SCIENTIFIC REPORTS
(2022)
Article
Biodiversity Conservation
Aurelie M. Guillou, Nathalie Bodin, Emmanuel Chassot, Antoine Duparc, Theotime Fily, Philippe S. Sabarros, Mathieu Depetris, Monin J. Amande, Juliette Lucas, Emilie Augustin, N'guessan C. Diaha, Laurent Floch, Julien Barde, Pedro Pascual-Alayon, Jose Carlos Baez, Pascal Cauquil, Karine Briand, Julien Lebranchu
Summary: This study combined historical and current datasets on the biology of tropical tunas and bycatch fish caught by large-scale purse seiners in the Eastern Atlantic Ocean and Western Indian Ocean, resulting in the creation of the Tunabio database, which contains morphometric and biological data on over 80,000 fish individuals.
BIODIVERSITY DATA JOURNAL
(2022)
Article
Environmental Studies
Eric Gilman, Jenn Humberstone, Jono R. Wilson, Emmanuel Chassot, Alexis Jackson, Petri Suuronen
Summary: There is a growing recognition of the need to address the negative ecological and socioeconomic impacts of abandoned, lost and discarded fishing gear (ALDFG). However, the drivers and consequences of ALDFG vary greatly depending on the type of gear, region, scale, and individual fishery. Therefore, it is important to implement specific interventions based on the context of each fishery. This study compiled comprehensive databases of causes of ALDFG production and mitigation methods, providing valuable information for effective management.
Article
Geosciences, Multidisciplinary
Nicolas Bez, Didier Renard, Dedah Ahmed-Babou
Summary: This study utilizes empirical orthogonal maps (EOMs) to analyze the spatiotemporal observations of octopus distribution off the Mauritanian coast. The results show that ten basic maps can recover 68% of the total variability, and the first two EOMs explain 38.4% of this variability. The paper clarifies the concept of orthogonality between factors in a spatial context, providing conditions for using Euclidean distance and reducing a large set of spatial distributions into a small subset of basic spatial distributions explaining most of the variability within the set of input maps.
MATHEMATICAL GEOSCIENCES
(2023)
Article
Environmental Studies
Hilaire Drouineau, Fabien Moullec, Didier Gascuel, Francis Laloe, Sterenn Lucas, Nicolas Bez, Patrice Guillotreau, Jerome Guitton, Pierre-Yves Hernvann, Martin Huret, Sigrid Lehuta, Marc Leopold, Stephanie Mahevas, Marianne Robert, Mathieu Woillez, Youen Vermard
Summary: Since the 1980s, the Common Fisheries Policy (CFP) has been criticized for its lack of protection for fishermen and ecosystems. The recent initiative led by French fishery scientists highlights the need for transparency, consultation, and urgency in the Mediterranean Sea. Scientists propose an ecosystem approach to fisheries and emphasize the importance of considering climate change in the reform of CFP.
Article
Multidisciplinary Sciences
Jerome Roux, Nicolas Bez, Paul Rochet, Rocio Joo, Stephanie Mahevas
Summary: This paper studies the neglected small graphs with high densities of connections and explores the relationship between Erds-Renyi, Fitness Scale-Free, Watts-Strogatz small-world, and geometric graphs and GCD(11) through numerical experiments. It also develops a randomization statistical test based on GCD(11) and applies it to a fishing case study to compare real-world graphs with four possible null models.
Article
Fisheries
Dedah Ahmed-Babou, Herve Demarcq, Beyah Meissa, Nicolas Bez
Summary: This study introduces the concept of portfolios of distribution maps, which consist of a reduced set of empirical orthogonal maps that best explain spatial biomass distributions of a given species over time. The approach is demonstrated using the distributions of common octopus off Mauritania over the last thirty years. The size of each portfolio represents the number of distinct spatial patterns describing octopus spatial distributions.
AQUATIC LIVING RESOURCES
(2023)