305,529 research outputs found
Il caso dell’anguilla europea, tra gestione e conservazione.
No full textThe European eel, Anguilla anguilla L., is recognised today as an international marine species and a shared resource among European and Mediterranean countries. For this species, major problems exist in relation to a continent-wide decline in recruitment observed in the course of the last decades, and to a contraction in adult eel capture fisheries. In relation to this situation, debate on the possible measures to protect the European eel stock is topical at the present moment, also in relation to a series of steps undertaken by the European Community
Joint EIFAAC/ICES/GFCM Working Group on Eels (WGEEL). International Council for the Exploration of the Sea (ICES). ICES Scientific Report, No. 50, Vol.. 1
No full textE. Ciccotti. Profilo di Augusto,1 938
No full textMerlin Alfred. E. Ciccotti. Profilo di Augusto,1 938. In: Journal des savants, Juillet-août 1939. pp. 181-182
E. Ciccotti. Profilo di Augusto,1 938
No full textMerlin Alfred. E. Ciccotti. Profilo di Augusto,1 938. In: Journal des savants, Juillet-août 1939. pp. 181-182
HANDBOOK ON FISH AGE DETERMINATION - a Mediterranean experience DIADROMOUS SPECIES - 6.1 Anguilla anguilla
No full textFish age, among other biological parameters, is one of the most relevant pieces of data in
reaching sustainable exploitation of fshery resources. Indeed, most analytical methods
used in stock assessment require knowledge of demographic structure according to the age
of stocks, as well as to recruitment, growth, maturity, natural mortality, etc., which are strictly
linked to information on age and age structure.
The literature on ageing analysis shows some gaps regarding ageing schemes, criteria
and methodologies used in preparing calcifed structures. These aspects afect both the
precision and accuracy of age estimation. One action that could be taken to overcome this
gap was to formalize a handbook that clarifed approaches to ageing schemes, criteria and
preparation methods. Having a common protocol is fundamental to decreasing relative/
absolute bias associated with the activities of age determination and to improving the
precision (reproducibility and reduction of the coefcient of variation) of age readers from
the various laboratories. In the light of these considerations, this handbook aims to be a
guideline to standardizing the methods used in fsh ageing studies. The document is focused
on a description of the general principles on which age analysis relies (assignment of birth
date, preparation methods, aging scheme reading and identifcation of true and false rings).
Moreover, common shared analysis methods can enable a high level of calibration among the
diverse institutes involved, thus improving the quality and reliability of results.
The volume is subdivided into fve main sections: small pelagic species, demersal species,
cartilaginous species, large pelagic species and diadromous species. For each section,
information on extraction and storage, preparation method, interpretation of age (age
scheme) and ageing criteria are provided by species. In total, 30 species were analysed: 6 small
pelagic, 12 demersal, 5 cartilaginous, 6 large pelagic and the European eel. These species
represent some of the most important fsh from an economic and ecological point of view.
Thus this volume represents one of the most complete outlooks for fsh ageing analysis in the
Mediterranean context
Non-equilibrium by molecular dynamics: a dynamical approach
No full textSome time ago, Ciccotti and Jacucci [Phys. Rev. Lett. 1975;35:789-792] – on the basis of Onsager regression hypothesis as explained by Kubo – suggested and implemented an original approach to study both stationary and time-dependent situations in non-equilibrium systems. The key idea of their approach was to tackle separately the dynamical evolution from the problem of sampling the initial condition. In this review, we discuss the evolution of this approach dubbed D-NEMD, the dynamical approach to non-equilibrium molecular dynamics, to differentiate it from the stationary NEMD methods. We will go through the D-NEMD theoretical framework and illustrate how it allows to compute time-dependent macroscopic dynamical behaviours by averaging on a large sample of non-equilibrium trajectories starting from an ensemble of initial conditions associated to a suitable distribution (either equilibrium or non-equilibrium) at time zero. We discuss a few case studies where the D-NEMD method is illustrated: first for ‘historical’ applications, like the study of transport properties in the linear and non-linear regimes, including a divertissement on the calculation of time correlation functions in the Gran Canonical ensemble. We finally briefly illustrate D-NEMD applications to the study of problems arising in key hydrodynamic processes such as the formation of convective cells and the relaxation of a non-uniform density profile in a fluid, giving attention to the problem of sampling the conditional probability density ensemble associated with the initial states
E. Ciccotti. La civiltà del mondo antico, 1935
No full textMerlin Alfred. E. Ciccotti. La civiltà del mondo antico, 1935. In: Journal des savants, Juillet-août 1936. pp. 181-182
E. Ciccotti. Lineamenti dell' evoluzione tributaria nel mondo antico
No full textAndréadès A. E. Ciccotti. Lineamenti dell' evoluzione tributaria nel mondo antico. In: Revue des Études Grecques, tome 35, fascicule 163, Octobre-décembre 1922. pp. 454-456
On the establishment of thermal diffusion in binary Lennard-Jones liquids
No full textThe establishment of thermal diffusion in an Ar-Kr Lennard-Jones mixture is investigated via dynamical non equilibrium molecular dynamics [G. Ciccotti, G. Jacucci, Phys. Rev. Lett. 35, 789 (1975)]. We observe, in particular, the evolution of the density and temperature fields of the system following the onset of the thermal gradient. In stationary conditions, we also compute the Soret coefficient of the mixture. This study confirms that dynamical non equilibrium molecular dynamics is an effective tool to gather information on transient phenomena, even though the full evolution of the mass and energy fluxes associated to the temperature and density fields requires, in this case, a more substantial numerical effort than the one employed here
European eel in the Mediterranean Sea – Outcomes of the GFCM Research programme
No full textIn line with the provisions of Recommendation GFCM/42/2018/1 on a multiannual management plan for European eel in the Mediterranean Sea and on the basis of the discussions held at the 2018 Working Group on the management of European eel, a GFCM research programme on European eel (Anguilla anguilla) was carried out from 2020 to 2022. Divided into five work packages, it was executed as a concerted action joining the forces of ongoing research conducted by research institutes, universities and the relevant administrations of nine partner countries (Algeria, Albania, Egypt, France, Greece, Italy, Spain, Tunisia and Türkiye). The main aim of the research programme was to devise a coordinated framework for the collection and analysis of data, as well as for the assessment and management of the resource, with a view to laying the groundwork for a long-term, multiannual management plan for European eel in the Mediterranean.
The research programme enabled the collection of data and information on management and protection measures for stock recovery at both the national and local levels, as well as on eel fisheries and eel habitats and the biological and ecological features of local eel stocks. Meanwhile, it also established a common framework for assessing European eel stocks at different scales in the Mediterranean. This publication compiles and presents the results of the analyses carried out, together with the data collected, within the framework of this research programme, and it provides the scientific basis for advice on fishery management measures towards the recovery of eel stocks, using the evidence collected as a foundation for action tailored to the Mediterranean scenario
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