A5035897790- Marine and fisheries research
- Marine Bivalve and Aquaculture Studies
- Fish Ecology and Management Studies
- Coastal and Marine Management
- Coral and Marine Ecosystems Studies
- Fish Biology and Ecology Studies
- French Urban and Social Studies
- Isotope Analysis in Ecology
- Ichthyology and Marine Biology
- Food Industry and Aquatic Biology
- Oceanographic and Atmospheric Processes
- Cassava research and cyanide
- Maritime Navigation and Safety
- Delphi Technique in Research
- Sustainability and Climate Change Governance
- Marine Ecology and Invasive Species
- Aquatic Ecosystems and Biodiversity
- Evolutionary Game Theory and Cooperation
- Construction Project Management and Performance
- Agriculture and Rural Development Research
- Marine and coastal plant biology
- Biological Control of Invasive Species
- Underwater Acoustics Research
- Plant and animal studies
- Census and Population Estimation
Ifremer
2007-2021
Institut National de Recherche Halieutique
2012-2018
Secretariat of the Pacific Community
1997-1998
Abstract Marine ecosystems evolve under many interconnected and area‐specific pressures. To fulfil society's intensifying diversifying needs while ensuring ecologically sustainable development, more effective marine spatial planning broader‐scope management of resources is necessary. Integrated ecological–economic fisheries models ( IEEFM s) systems are needed to evaluate impacts sustainability potential actions understand, anticipate ecological, economic social dynamics at a range scales...
Abstract In 2002, a pilot experiment on hake tagging was carried out using methodology specifically developed to catch and handle fish in good condition. By the end of 2005, 36 five tags had been returned laboratory (a 3.1% return rate) with maximum time at liberty 1066 days. The somatic growth recoveries proved be twofold higher than that expected from published von Bertalanffy functions for species Bay Biscay. underestimation related age overestimation, as demonstrated by two independent...
Abstract The World Conference on Stock Assessment Methods (July 2013) included a workshop testing assessment methods through simulations. exercise was made up of two steps applied to datasets from 14 representative fish stocks around the world. Step 1 involved applying stock assessments with varying degrees effort dedicated optimizing fit. 2 subset and characteristics given model fits being used generate pseudo-data error. These were then provided modellers consistency checks within...
Skipjack tuna ( Katsuwonus pelamis ) contributes ≈70% of the total catch in Pacific Ocean. This species occurs upper mixed‐layer throughout equatorial region, but largest catches are taken from warmpool western Pacific. Analysis and effort data for US purse seine fisheries has demonstrated that one most successful fishing grounds is located vicinity a convergence zone between warm (>28–29°C) low‐salinity water cold saline upwelling central (Lehodey et al ., 1997). convergence, identified...
Abstract Reconciling food security, economic development and biodiversity conservation is a key challenge, especially in the face of demographic transition characterizing many countries world. Fisheries marine ecosystems constitute difficult application this bio‐economic challenge. Many experts scientists advocate an ecosystem approach to manage socio‐ecosystems for their sustainability resilience. However, ways by which operationalize ecosystem‐based fisheries management ( EBFM ) remain...
We are developing a spatial, multigear, multispecies population dynamics simulation model for tropical tunas in the Pacific Ocean. The is age‐structured to account growth and gear selectivity. It includes tuna movement based on diffusion–advection equation which advective term proportional gradient of habitat index. monthly geographical distribution recruitment defined by assuming that spawning occurs areas where sea surface temperature above 25°C. During first 3 months their life, simulated...
Abstract European hake (Merluccius merluccius) were caught alive in the northern Bay of Biscay June/July 2002, using a codend specially designed to avoid crushing fish and also retain water while hauling trawl. In all, 1307 tagged with anchor T-bar tags, injected tetracycline, then released. The length range marked varied from 13 58 cm, modal size was 28 at which they assumed be 2–3 years old. A mean survival rate 68.2% estimated. Mortality mainly caused by stress capture physical damage,...
The shifting policy focus towards Ecosystem Based Management in Fisheries (EBFM) requires the integration of knowledge and disciplines engagement stakeholders to support decision-making processes. Scientists contribute this through (i) participatory research projects, (ii) stakeholder partnerships (iii) institutional scientific advice Understanding role scientists such processes, nature interactions between scientists, managers link science is an emerging field addressing transdisciplinary...
Rent generated by the tuna fisheries occurring in waters of Pacific Islands Nations is estimated for various levels and combinations purse-seine, pole-and-line, frozen longline, fresh longline fishing effort, using a multi-species, multi-fleet bioeconomic model. The underlying population model integrates available information on dynamics skipjack, yellowfin, bigeye, Southern albacore tunas Ocean. economic utilizes most recent data effort costs purse seine, fleets operating western central...
Abstract Bertignac, M., and de Pontual, H. 2007. Consequences of bias in age estimation on assessment the northern stock European hake (Merluccius merluccius) management advice. – ICES Journal Marine Science, 64: 981–988. The results a pilot tagging study merluccius), conducted part Bay Biscay 2002, indicate that growth rates for this may be currently underestimated because biased estimates age. impact such have dynamics trends key population parameters, recruitment, spawning-stock biomass...
Abstract de Pontual, H., Jolivet, A., Garren, F., and Bertignac, M. 2013. New insights on European hake biology population dynamics from a sustained tagging effort in the Bay of Biscay. – ICES Journal Marine Science, 70: . Following pilot experiment that fundamentally challenged knowledge life traits (growth age at first maturity), was carried out Biscay 2004 to 2007. Out 27 690 fish tagged between 2002 2007, 1199 (4.3%) have been recovered date. These data permitted refinement growth...
Several fleets with various fishing strategies operate as a mixed fishery in the Bay of Biscay. Among main fleets, bottom trawlers target Norway lobster (Nephrops norvegicus) and, together gillnetters, they also catch hake (Merluccius merluccius). Trawling leads to average-size catches that are below minimum landing size (MLS); such discarded since cannot be sold. These discards result negative impacts on stock renewal, most them do not survive. This results an economic loss for both and...
European sea bass, Dicentrarchus labrax, is a highly valuable species in Europe, both for aquaculture the Mediterranean Sea and commercial recreational fisheries North East Atlantic Ocean. Subjected to increasing fishing pressure, wild population has recently experienced significant recruitment fluctuation as well northward extension of its distribution area Sea. While nature ecological and/or physiological processes involved remains unresolved, ontogenetic habitat shifts adult site fidelity...
Drouineau, H., Mahévas, S., Bertignac, M., and Duplisea, D. 2010. A length-structured spatially explicit model for estimating hake growth migration rates. – ICES Journal of Marine Science, 67: 1697–1709.
A pioneering experiment of archival tagging European hake Merluccius merluccius provided evidence a diel vertical migration pattern which was analysed using an automatic method, developed and validated through time‐frequency analyses. Frequent movements across the thermocline were observed fish experienced rapid temperature changes >7° C. These tagging–recapture data also suggested homing behaviour to feeding grounds.