Bibliografie tematiche / Anguilla

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Letteratura scientifica selezionata sul tema "Anguilla"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 1 agosto 2024

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Articoli di riviste sul tema "Anguilla"

1

Elgendy, Mamdouh Yousif, Amany Mohamed Kenawy e Ahmed E. Noor El-Deen. "Gyrodactylus anguillae and Vibrio vulnificus infections affecting cultured eel, Anguilla anguilla". Comunicata Scientiae 7, n. 1 (10 maggio 2016): 1. http://dx.doi.org/10.14295/cs.v7i1.1248.

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Abstract (sommario):
Gyrodactylus anguillae and Vibrio vulnificus are pathogens of critical significance in anguilliculture. Both agents were involved in mortalities affecting earthen pond cultured European eel, Anguilla anguilla, in Egypt during the period extended from June to September 2014. Moribund eels showed excessive slimy mucus and haemorrhages on the external body surface. All investigated eels were parasitized with the monogenean, Gyrodactylus anguillae. Majority of specimens 93.3 % were concomitantly found to be infected with V. vulnificus. No other parasitic or bacterial infections were noticed in the investigated fish samples. V. vulnificus was detected in Gyrodactylus anguillae homogenates collected from diseased fish. Bacterial isolates were confirmed by polymerase chain reaction (PCR). G. anguillae were demonstrated in skin and gills histopathological sections. Varieties of circulatory, proliferative as well as degenerative changes were noticed in haemopoietic tissues. It was concluded that G. anguillae presumably enhanced eels vulnerability to V. vulnificus infections through providing portals of entry as well as acting as mechanical vectors.
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2

Kuroki, Mari, Jun Aoyama, Michael J. Miller, Shun Watanabe, Akira Shinoda, Donald J. Jellyman, Eric Feunteun e Katsumi Tsukamoto. "Distribution and early life-history characteristics of anguillid leptocephali in the western South Pacific". Marine and Freshwater Research 59, n. 12 (2008): 1035. http://dx.doi.org/10.1071/mf08041.

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Abstract (sommario):
Freshwater eels are important fisheries species in parts of the western South Pacific, but little is known about their oceanic early life history or spawning areas. The age, growth, morphology and geographic distribution of five species of genetically identified anguillid leptocephali collected in 1995, 2000 and 2005 were compared. The sizes and ages of the leptocephali collected, Anguilla australis (n = 18), Anguilla marmorata (n = 15), Anguilla reinhardtii (n = 12), Anguilla megastoma (n = 2) and Anguilla obscura (n = 1), ranged from 19.0 to 50.9 mm and from 25 to 155 days, respectively. Leptocephali were mostly collected in the South Equatorial Current region. The total myomere ranges overlapped among species, but anodorsal myomere numbers clearly divided shortfinned and longfinned eels. The myomere ranges of the leptocephali were similar to the reported ranges of the numbers of vertebrae in adults. Larval growth rates suggested that the temperate species A. australis had slightly slower growth than the tropical species A. reinhardtii. The present study suggests that both temperate and tropical anguillid eels use the South Equatorial Current region for spawning and larval development, although some species might have different early life parameters and migration routes to their recruitment areas.
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3

Ernst, I., A. Fletcher e C. Hayward. "Gyrodactylus anguillae (Monogenea: Gyrodactylidae) from Anguillid Eels (Anguilla australis and Anguilla reinhardtii) in Australia: A Native or an Exotic?" Journal of Parasitology 86, n. 5 (ottobre 2000): 1152. http://dx.doi.org/10.2307/3284842.

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4

Kennedy, C. R., e C. Moriarty. "Co-existence of congeneric species of Acanthocephala: Acanthocephalus lucii and A. anguillae in eels Anguilla anguilla in Ireland". Parasitology 95, n. 2 (ottobre 1987): 301–10. http://dx.doi.org/10.1017/s0031182000057759.

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Abstract (sommario):
SUMMARYA population of eels Anguilla anguilla from Lough Derg, R. Shannon, Ireland, harbouring infections of both Acanthocephalus lucii and A. anguillae was studied over three years. Both parasite species had the same intermediate host and eels appeared to be the only definitive host for A. anguillae. Throughout the whole period, A. lucii was the dominant parasite, was over-dispersed throughout the eel population and most frequently occurred as a single species infection. A. anguillae was far less common, its dispersion was close to random at most times and it almost invariably occurred as a mixed species infection. The proportions of the two species remained fairly constant over the period. Despite some indication of site selection in the intestine, the distribution of both species overlapped considerably and there was no evidence of competitive displacement of one species by the other or of resource partitioning in space. The life-histories of both species were similar: they infected eels, bred and were lost from fish at the same time of year and there was no indication of resource partitioning in time. Congeneric species of acanthocephalans can thus co-exist in apparently stable equilibrium in fish as predicted and without any evidence of interactions, but it is still considered that exploitation competition between the species may be occurring in eels.
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5

van Nieuwstadt, AP, SG Dijkstra e OLM Haenen. "Persistence of herpesvirus of eel Herpesvirus anguillae in farmed European eel Anguilla anguilla". Diseases of Aquatic Organisms 45 (2001): 103–7. http://dx.doi.org/10.3354/dao045103.

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6

Hilario, Joyce, Casiano Jr Choresca, Ma Jodecel Dantinga, Faith Loraine Magbanua e Ma Theresa Oclos. "Identification of Tropical Freshwater Eels, Anguilla spp., in Cagayan River, Philippines". Philippine Agricultural Scientist 105, n. 3 (1 settembre 2022): 226–35. http://dx.doi.org/10.62550/abc001021.

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Abstract (sommario):
Anguillid eels are high-value food fish with 16 known species worldwide. Due to its taxonomic ambiguity and insufficient data on species composition, this family of freshwater eels were inadvertently regarded as a single species. This study collected 63 freshwater eels at 3 life stages (glass eel, elver, yellow eel) from Cagayan River, Philippines, to evaluate the accuracy of morphological identification in comparison with molecular analysis. Morphological results displayed clear distinctiveness between Anguilla bicolor and Anguilla marmorata despite some overlapping physical characteristics between Anguilla marmorata and Anguilla luzonensis. Phylogenetic analysis revealed that 15 out of 23 glass eel specimens were molecularly identified as A. marmorata, while 8 were identified as A. bicolor pacifica. For elver specimens, there were A. bicolor pacifica (n = 10), A. marmorata (n = 8), and A. luzonensis (n = 2). For yellow eels, there were A. bicolor pacifica (n = 10) and A. marmorata (n = 10). The results showed the inaccuracy of morphological identification in determining the richness and composition of Anguillids, which otherwise proved that molecular analysis is a more reliable approach in identifying freshwater eel species.
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Nuryanto, Agus, Dian Baghawati, Kusbiyanto Kusbiyanto, Moh Husein Sastranegara e Farida Nur Rachmawati. "Molecular Characterization of Anguilla from Cibereum and Sapuregel Rivers Segara Anakan Watersheds Cilacap, Central Java". Biogenesis: Jurnal Ilmiah Biologi 8, n. 2 (30 dicembre 2020): 145. http://dx.doi.org/10.24252/bio.v8i2.15532.

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Abstract (sommario):
The taxonomic status of Anguilla species' in river watershed that empties into Segara Anakan Cilacap is uncertain, thereby making it difficult for further studies to be carried out to determine its genetic in that area. Therefore, this study evaluates Anguilla's taxonomic status and population genetic in Cibeureum and Sapuregel River watersheds. Data were obtained from molecular characterization study using cytochrome c oxidase 1, with fourteen Anguilla specimens collected from two sequenced watersheds. Taxonomic status was determined based on homology and divergence values and monophyly of the samples to the reference species. Meanwhile, genetic divergences among samples to the reference species were calculated based on the Juke-Cantor substitution model in DnaSP6. A homology test was performed using a basic local alignment search tool, with monophyly inferred from the cladogram, which was developed using neighbor-joining and maximum likelihood algorithms in MEGAX with 1000 pseudoreplicates and out-group comparison. Furthermore, population genetic was analyzed through polymorphism, haplotype, nucleotide diversity within the population, divergence, and genetic differences. All calculations conducted in Arlequin 3.5 had Anguilla samples comprising of high (99.23% to 99.84%) to low genetic divergences (0.224% to 1.127%). The result shows that cladogram with all Anguilla samples formed a monophyletic clade with A. bicolor, separated from their taxa. Furthermore, Anguilla samples from both watersheds have low genetic polymorphisms with medium to high haplotype and nucleotide diversity. The population's comparison proved that both populations have low genetic divergence, and no genetic difference based on variance analysis (p=0761). Therefore, Anguilla resources in river watersheds that empty into Segara Anakan are a single genetic conservation unit.
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BENAJIBA, MOHAMED HASSAN, ADAM MARQUES, JIŘÍ LOM e GEORGES BOUIX. "Ultrastructure and Sporogony of Eimeria (syn. Epieimeria) anguillae (Apicomplexa) in the Eel (Anguilla anguilla)". Journal of Eukaryotic Microbiology 41, n. 3 (maggio 1994): 215–22. http://dx.doi.org/10.1111/j.1550-7408.1994.tb01500.x.

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9

Jakob, E., H. Neuhaus, D. Steinhagen, B. Luckhardt e R. Hanel. "Monitoring ofHerpesvirus anguillae(HVA) infections in European eel,Anguilla anguilla(L.), in northern Germany". Journal of Fish Diseases 32, n. 6 (giugno 2009): 557–61. http://dx.doi.org/10.1111/j.1365-2761.2009.01009.x.

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10

Zan, Nur Dhabita, Ain Sarbini, Hussein Taha, Iy Vonne Tan, Azie Azri, Rafhiah Kahar, Faizah Metali, Norhayati Ahmad e Takaomi Arai. "Occurrence and ecological implication of a tropical anguillid eel, Anguilla marmorata, in Brunei Darussalam, Borneo Island". Zoologia 37 (3 giugno 2020): 1–7. http://dx.doi.org/10.3897/zoologia.37.e39468.

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Abstract (sommario):
Tropical anguillid eels account for two-thirds of the 19 species in Anguilla Schrank, 1798. However, information on the species diversity, geographical distribution, and life histories of the tropical eels is very limited. Recent studies suggested that morphological species identification of the tropical anguillid eels should be validated by molecular analysis for accurate identification. After surveying for three years, two anguillid eels were found in Brunei Darussalam, Borneo Island. They were firstly identified as Anguilla marmorata Quoy & Gaimard, 1824 using morphological analysis and further gene analysis of cytochrome c oxidase subunit I (COI) confirmed the species identification. This study is the first comprehensive description of A. marmorata in Brunei Darussalam, Borneo Island. Furthermore, it is also the first study to validate two anguillid eels collected from the tropical Bonin Islands of Japan as A. marmorata by means of morphological and COI analyses. The molecular phylogenetic tree and haplotype network analyses suggest that A. marmorata found in Brunei Darussalam would belong to the North Pacific population of the westernmost distribution.
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Più fonti

Tesi sul tema "Anguilla"

1

Garzón, Cortés Victor Daniel Ladislao. "Inducción hormonal de la espermiación y criopreservación de esperma en anguila europea (Anguilla anguilla)". Doctoral thesis, Universitat Politècnica de València, 2008. http://hdl.handle.net/10251/1944.

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Abstract (sommario):
La producción de anguilas se basa en la captura de angulas, pero la captura de éstas no se ha podido incrementar al mismo ritmo que su demanda para el engorde en piscifactorías. La caída de las capturas de angulas llevó a la búsqueda por todo el mundo de nuevos suministros, planteándose la reproducción en cautividad como una de las alternativas de mayor importancia. Debido a que las anguilas no maduran sexualmente en cautividad se han desarrollado métodos de inducción hormonal que logran la producción de volúmenes importantes de esperma de buena calidad (Pérez et al. 2000; Asturiano et al. 2004; Müller et al. 2004). Este hecho ha motivado el interés por desarrollar técnicas para la recolección y manejo apropiado del esperma de esta especie. En este sentido se decidió realizar una serie de experimentos con la finalidad de desarrollar técnicas de congelación y estudios sobre la calidad del esperma de anguila europea. El primero de ellos trató de optimizar los tratamientos de inducción hormonal en machos de anguila europea (procedentes de piscifactoría) para obtención de esperma. Fueron probados cinco tratamientos hormonales (A-E) con gonadotropina coriónica humana (hCG) para inducir la maduración gonadal y la espermiación en machos de anguilas procedentes de piscifactoría. Se vio que una dosis semanal de 1.5 UI hCG/g pez, es la que permite obtener un mayor porcentaje de machos espermiantes, un periodo de espermiación más largo y un mayor volumen de esperma. A continuación se estudiaron protocolos de criopreservación utilizando como base medios diluyentes descritos para anguila japonesa (K15, K30, TNK) y dos descritos anteriormente para anguila europea (P1 y P2). A los espermatozoides congelados en estos medios se les realizaron análisis de movilidad (pre y postcongelación): la velocidad angular (VAP), velocidad curvilínea (VCL), velocidad de línea directa (VSL) y frecuencia de batido del flagelo (BCF). Estos parámetros se analizaron con un programa inform
Garzón Cortés, VDL. (2007). Inducción hormonal de la espermiación y criopreservación de esperma en anguila europea (Anguilla anguilla) [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/1944
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2

Cavacini, Andrea. "Studio della diversa espressione di proteine del siero nelle anguille (Anguilla anguilla) gialle ed argentine mediante analisi proteomica". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amslaurea.unibo.it/5100/.

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Abstract (sommario):
L’anguilla europea (Anguilla anguilla) è una specie eurialina catadroma, la cui area di riproduzione si trova a grande distanza dall’areale di distribuzione. Presenta un ciclo biologico piuttosto complesso caratterizzato da due metamorfosi: la prima, tipicamente larvale permette al “leptocefalo”, forma larvale marina tipica degli anguilliformi, di trasformarsi in anguilla “ceca”; la seconda, invece, trasforma l’anguilla “gialla” in “argentina” attraverso un processo definito di “argentinizzazione” nel quale si delineano preadattamenti alla maturazione sessuale che sarà completa durante la migrazione riproduttiva verso il Mar dei Sargassi. L’”argentinizzazione” innesca modificazioni fisiologiche (regressione del tratto digestivo), e morfologiche (aumento della massa corporea, ispessimento della pelle, modificazione dell’occhio e nuova pigmentazione). Il colore bruno verdastro con ventre giallo è prerogativa delle anguille in fase trofica, cioè quelle gialle, sessualmente immature. Quelle argentine presentano, invece, una colorazione più scura sul dorso e argenteo sul ventre. Inoltre le anguille argentine vanno incontro a cambiamenti ormonali per adattarsi all’ambiente marino, compiere la lunga migrazione e riprodursi. Per avere a disposizione risorse energetiche anche senza nutrirsi per molti mesi, devono accumulare grandi riserve di cui il 60% è destinato per lo sviluppo delle gonadi. Tuttavia i processi metabolici che consentono alle anguille argentine di effettuare lunghe migrazioni mantenendo un’alta efficienza del nuoto e nel contempo utilizzando limitate risorse, non sono sufficientemente conosciuti. Per fornire nuove informazioni, questo lavoro di tesi ha indagato se vi sia una modificazione del quadro proteico del siero delle anguille argentine rispetto alle gialle, e quali proteine eventualmente risultino sovra- o sotto- espresse in ciascuna delle due fasi del ciclo biologico. A tale fine si è applicata una tecnica innovativa, quale l’analisi proteomica, che permette di identificare in modo sistematico le proteine all’interno di un substrato biologico come iin questo caso il siero. Le anguille gialle ed argentine prese in esame sono state prelevate nelle Valli di Comacchio (FE). La valutazione quantitativa delle proteine, separate tramite elettroforesi bidimensionale su gel di poliacrilamide, si è fondata sull’analisi delle immagini attraverso specifici programmi (Proteomweaver). A tale proposito, si sono confrontati i gel di anguilla gialla ed argentina individuando gli spot corrispondenti alle proteine e quantificandoli. Gli spot differenzialmente espressi sono stati prelevati per essere poi identificati tramite spettrometria di massa (MS/MS), arrivando al riconoscimento di diverse proteine. Tra queste, sono state identificate due diverse isoforme di apolipoproteina, l’una più espressa nell’anguilla gialla, l’altra nell’argentina; tali proteine svolgono un ruolo importante nella facilitazione del trasporto lipidico e nell’assorbimento dei lipidi associato anche con la crescita degli ovociti. Il treno di spot relativo alla transferrina è decisamente più evidente nelle anguille argentine, il che potrebbe essere correlato al ruolo del ferro nell’emoglobina, mirato ad un maggiore apporto di ossigeno ai tessuti durante la lunga migrazione riproduttiva di questi animali. Lo studio è del tutto nuovo e al momento non sono disponibili sufficienti informazioni al contorno per trarre più ampie conclusioni; tuttavia esso merita di essere proseguito per contribuire alla comprensione degli eventi di metamorfosi in questa specie dal ciclo vitale complesso e in gran parte sconosciuto.
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3

Liu, Hengtong. "The relationship between migration behavior and energetic status in the European glass eel (Anguilla anguilla)". Thesis, Pau, 2020. http://www.theses.fr/2020PAUU3014.

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Abstract (sommario):
L'anguille européenne (Anguilla anguilla) présente un cycle de vie complexe avec un stade civelle qui remonte les estuaires pour atteindre les rivières et entamer une phase de croissance. Cependant, cette migration estuarienne est connue pour être facultative, certains individus s'installant en mer, en estuaire ou alternant les séjours en rivière et en estuaire. Les civelles ne se nourrissent pas ou peu pendant leur migration et leurs schémas migratoires pourraient donc être étroitement associés aux réserves énergétiques des individus. La migration facultative des civelles pourrait donc reposer sur une stratégie conditionnelle, les individus présentant d’importantes réserves d'énergie ayant une capacité migratoire élevée. Cependant, certaines études s’avèrent contradictoires et l’objectif de cette thèse était d'étudier la stratégie conditionnelle chez les civelles européennes en se basant non seulement sur les réserves d'énergie mais également sur la mobilisation de l'énergie (métabolisme et expression des gènes liés à l'énergie). L’essentiel des travaux a été mené à la fois sur des civelles d'automne et de printemps, car elles présentent d’importantes différences de réserves énergétiques. Nous avons tout d'abord caractérisé le statut énergétique individuel des civelles marines échantillonnées en automne et au printemps et l’avons relié à leur comportement migratoire évalué dans des installations expérimentales. Les civelles d'automne présentaient des réserves énergétiques plus élevées et une plus grande capacité à produire de l'énergie que les civelles de printemps. Ces résultats confirment que les civelles d'automne et de printemps présentent de fortes différences dans leur statut énergétique et qu'elles doivent être étudiées séparément. Nous émettons l'hypothèse qu'il pourrait exister un seuil énergétique en dessous duquel la migration pourrait être conditionnée par ce facteur. Afin de mieux comprendre les mécanismes de sédentarisation dans les estuaires, la relation entre le statut énergétique et le comportement migratoire des civelles marines et estuariennes a ensuite été étudié parallèlement en automne et au printemps. Nos résultats soutiennent l’hypothèse d’une stratégie conditionnelle basée sur l'énergie lorsque les réserves énergétiques deviennent un facteur limitant (civelles de printemps). La perte de poids, la mesure du métabolisme et l'expression de gènes liés au métabolisme suggèrent également que les civelles estuariennes étaient plus stressées et avaient une capacité de production d'énergie plus faible que les marines. Les civelles non synchronisées au courant (considérées comme ayant une faible probabilité de migration) présentaient une dépense énergétique plus élevée que les individus synchronisés, ce qui pourrait refléter un stress et/ou une vulnérabilité au stress plus élevés chez les premières. Afin de tester cette hypothèse, des civelles ont été exposées à un facteur de stress potentiel dans les estuaires, à savoir le méthylmercure (MeHg), et les effets de ce contaminant sur le comportement migratoire et le statut énergétique des individus a été étudié. Nos résultats mettent en évidence une diminution de l’activité de nage chez les civelles non synchronisées mais pas chez les synchronisés, suggérant que les premières pourraient être plus sensibles au MeHg. Puis, les civelles non synchronisées présentaient un niveau d'expression des gènes du métabolisme inférieur à celui de leurs homologues synchronisées dans la tête et pas dans le muscle ni dans les viscères. Les travaux réalisés dans le cadre de cette thèse suggèrent que le statut énergétique et la sensibilité au stress pourraient conditionner la migration estuarienne des civelles mais les mécanismes sous-jacents et les relations entre ces facteurs ainsi qu’avec les horloges endogènes qui contrôlent la migration restent à élucider
Résumé en anglais : The European eel (Anguilla anguilla) present a complex life cycle with a glass eel stage migrating up estuary to reach river for growth. However, this estuarine migration is known to be facultative, with some individuals settling at sea, in estuaries or alternating stays in rivers and estuaries. As glass eels feed little or not at all during their migration, their divergent migration patterns may be closely associated with individual’s body condition. To date, one major theory of conditional strategy proposed that the facultative migration in European glass eels is based on energy stores, the individuals with a high migratory capacity presenting high energy stores. However, this theory has been proved controversial and the aim of this thesis was to investigate the conditional strategy in European glass eels based on more comprehensive measures of energetic status, including not only energy stores but also energy mobilization (metabolism and energy-related genes expression). We also focused on both autumn and spring glass eels, which present dramatic difference in energy stores. We first characterized the individual energetic status of marine glass eels sampled in autumn and spring and related this status to their migration behavior assessed in experimental facilities. Autumn glass eels presented higher energy stores and a higher ability to produce energy than spring ones. This confirmed that autumn and spring glass eels present strong differences in their energetic status and that they have to be studied separately. We hypothesized that a potential threshold in energetic status may exist below which migration could be conditioned by energetics. Then, to unveil the underlying mechanisms of settlement processes in estuaries in relation to energy-based conditional strategy, we investigated the relationship between energetic status and migration behavior in both marine and estuarine glass eels. Estuarine individuals displayed lower weight than marine ones in autumn but not in spring supporting the idea that a conditional strategy based on energy may explain facultative migration when energy reserves become a limiting factor. Weight loss, standard metabolism and the expression of metabolism-related genes suggested that estuarine glass eels were more stressed and had a lower capacity of energy production than marine fish. The non-synchronized glass eels also presented a higher energy expenditure than synchronized individuals possibly reflecting a higher stress and/or vulnerability to stress in the former. We further exposed glass eels to a potential stressor in estuaries - methylmercury (MeHg) in order to investigate the effects of this contaminant on glass eels’ migratory behavior and energetic status. Our results first suggested that non-synchronized glass eels were more vulnerable to MeHg reflected by a decrease in swimming activity. MeHg also affected the relation between individual metabolism-related genes expression level and swimming activity, supporting our hypothesis that stress factors may influence the settlement processes in glass eels. Finally, it is noteworthy that non-synchronized glass eels displayed lower expression level of metabolism genes than their synchronized counterpart in the head but not in muscle nor in viscera. Altogether, these results provided evidences that the energetic status and sensitivity to stress may condition estuarine migration in glass eels but the underlying mechanisms and relationships between these factors but also with the endogenous clocks driving migration remain to be elucidated
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Julie, Célia Claveau. "Impact du méthylmercure sur le potentiel de migration, le statut énergétique et les mécanismes de détoxication chez la civelle d’anguille européenne (Anguilla anguilla) : Etudes in situ et expérimentale". Thesis, Pau, 2014. http://www.theses.fr/2014PAUU3040/document.

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Européenne, (Anguilla anguilla) a conduit à une diminution du nombre d’anguille jaune dans les bassins versants. En 2007, le règlement (CE) instaure que 60% des civelles pêchées (<12 cm de long) doivent être dédiés à des opérations de repeuplement. Cependant, pour migrer et coloniser un nouvel environnement, les civelles doivent avoir une bonne condition énergétique. Or, les civelles ne s’alimentent pas ou peu durant leur migration estuarienne et la vitesse d’utilisation de leurs réserves dépend de divers facteurs (température, contaminants etc.). Dans l’estuaire de l’Adour, différents travaux ont mis en évidence de fortes concentrations en methylmercure (MeHg) dans les sédiments et une bioaccumulation de ce composé chez l’anguille jaune. L’exposition au MeHg entraîne la mise en place de processus de détoxication qui pourraient être couteux en énergie ce qui, chez des organismes jeûnant comme les civelles, conduirait à une perte de poids pouvant affecter leurs capacités de migration. Pour étudier l’impact du méthylmercure sur le potentiel de migration des civelles, nous avons tout d’abord (1) effectuer un état des lieux des concentrations en MeHg des civelles de l’estuaire de l’Adour, (2) évaluer l’effet du MeHg sur deux synchroniseurs de la migration estuarienne: le signal crépusculaire et l’alternance des marées chez les civelles grâce à l’utilisation de traceurs isotopiques et (3) étudier dans le milieu naturel (Adour) le comportement de migration, les taux de contamination au mercure et les mécanismes de détoxication des civelles. Nos résultats montrent des fluctuations temporelles et saisonnières de la concentration en MeHg des civelles prélevées en entrée et en milieu de l’estuaire. Par ailleurs, l’exposition au MeHg, en milieu contrôlé, a augmenté l'activité des civelles mais pas leur comportement de migration. Cependant, suite à la contamination, la structure mitochondriale et le métabolisme ont été modifiés suggérant un plus fort stress oxydant et une activation des défenses antioxydantes notamment des civelles ayant un faible potentiel de migration (non migrantes).En complément, l’étude en milieu naturel a mis en évidence une plus forte demande énergétique pour les civelles non migrantes entrainant une augmentation du fonctionnement des mitochondries et pouvant conduire à un plus fort stress oxydant
Over the last three decades, the arrival of Anguilla anguilla glass eels has markedly declined which has lead to a decrease in the number of yellow eels in the watersheds. In 2007, the Regulation (EC) indicated that 60% of glass eels (<12cm long) caught by fisheries should be used for restocking. To migrate and colonize a new environment, glass eels must have a good energetic condition. However, during their estuarine migration, glass eels either feed very little or more likely not at all. The speed at which they expend their energy stores depends on various factors (temperature, contaminants etc.). In the Adour estuary, many studies have reported relatively high methylmercury (MeHg) concentrations in the sediments, and bioaccumulation in yellow eels. Exposure to MeHg requires energy for detoxification which, in starving organisms such as glass eels, might lead to weight loss, decreasing their ability to migrate up the estuary. To study the impact of MeHg on migratory behaviour in glass eels, we first conducted an inventory of MeHg concentrations of glass eels in the estuary of the Adour, (2) evaluate the effect of MeHg on two synchronizers of estuarine migration: dusk and tide on glass eels through the use of isotopic tracers and (3) to study the natural environment (Adour) migratory behavior, mercury contamination levels and detoxification mechanisms of glass eels. Our results show temporal and seasonal fluctuations in the concentration of MeHg glass eels collected input and middle of the estuary. Moreover, MeHg exposure, in a controlled environment, increased the activity of glass eels but not in response to migratory behavior. However, due to contamination, mitochondrial structure and metabolism have been modified suggesting a stronger oxidative stress and activation of antioxidant defences of glass eels, particularly those with low migration potential (non-migrant). In addition, the wild study showed a higher energy demand for non-migrating glass eels causing an increase in mitochondrial function which may lead to higher oxidative stress
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5

Kiwan, Alisar. "Controllo adrenergico del metabolismo glucidico in Anguilla anguilla". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amslaurea.unibo.it/3005/.

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Le conoscenze relative al controllo ormonale del metabolismo epatico dei pesci sono ancora piuttosto limitate e per molti anni sono state controverse. Per lungo tempo si è ritenuto che le catecolamine, adrenalina e noradrenalina, agissero nel fegato dei pesci soltanto attraverso i recettori adrenergici di tipo β. Quindi l’assetto recettoriale dei mammiferi, che comprende recettori α e β, era considerato frutto di un processo evolutivo che non aveva ancora avuto luogo nei pesci. Successivamente, nel fegato di vari teleostei è stata dimostrata la presenza di recettori sia α che β. Tuttavia il ruolo fisiologico dei due tipi di recettori non è ancora chiaro. Per esempio, in acciughe e sgombri non è stato fatto alcuno studio sulla risposta alle catecolamine ottenuta attraverso i recettori α e β, nel fegato di trota i recettori α non sono accoppiati alla cascata fisiologica che porta al rilascio di glucosio, e in anguilla e pesce gatto l’azione delle catecolamine attraverso recettori β è predominante rispetto a quella attraverso recettori α. L’utilizzo di ligandi farmacologici non ha portato a chiarimenti significativi, perché la loro specificità per i recettori di mammifero non trova sempre riscontro nei pesci. In questo studio, quindi, abbiamo studiato l’espressione dei geni codificanti per i recettori α e β adrenergici attraverso la tecnica della PCR real time, ottenendo i primi dati in letteratura per quanto riguarda la loro quantificazione assoluta. L’organismo modello utilizzato è stata l’anguilla, teleosteo caratterizzato da un ciclo biologico molto particolare in cui si distinguono nettamente una fase gialla ed una argentina. Le anguille argentine non sono mai state studiate a tale proposito, e date le estreme differenze nella disponibilità e nell’uso delle risorse energetiche in questi due stadi di crescita, il presente studio ha mirato a valutare la differente sensibilità alle catecolamine da parte degli epatociti isolati da anguille gialle ed argentine. I nostri dati hanno confermato quanto solo ipotizzato nei vari studi pubblicati negli ultimi due decenni, ma mai avvalorato da risultati sperimentali, cioè che i recettori α e β sono contemporaneamente espressi negli epatociti dell’anguilla, sia gialla che argentina, e la proporzione tra loro giustifica il ruolo significativamente maggiore giocato dai recettori β. Nelle anguille argentine infatti, come nelle gialle, l’effetto dell’adrenalina sul rilascio di glucosio ottenuto attraverso recettori β è chiaramente predominante. Inoltre, i nostri dati indicano che in due diverse fasi del ciclo vitale dell’anguilla, così come si osserva nell’ontogenesi dei mammiferi, i recettori adrenergici sono espressi in quantità differente.
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6

Pabrinkytė, Sandra. "Europinio ungurio (Anguilla anguilla) išteklių valdymo galimybės Lietuvoje". Master's thesis, Lithuanian Academic Libraries Network (LABT), 2009. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2007~D_20090908_194023-44522.

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Staigus natūraliai migruojančių ungurių jauniklių skaičiaus mažėjimas didžiojoje paplitimo arealo dalyje stebimas nuo 1980 m. ICES (angl.: The International Council for the Exploration of the Sea) 2001 m. ungurių išteklių būklę įvardino kaip “esančią už saugių biologinio minimumo ribų”. Kokios priežastys lemia šitokį drastišką ungurių išteklių mažėjimą, aiškaus atsakymo nėra, tačiau mokslininkai kelia eilę hipotezių. Greičiausiai tokį išteklių mažėjimą lemia ne viena, o visas kompleksas priežasčių, tai besaikė žvejyba, klimato kaita, tarša, buveinių pakenkimas. Lietuvoje, ir kaimyninėse šalyse europinių ungurių ištekliai sumažėjo kaip ir visame jų paplitimo areale. Lyginant su 1982 metų sugavimais vidaus vandenyse jų sumažėjo dvigubai, o Kuršių mariose trigubai. Taip pat sumažėjo ir ungurių valstybiniai įžuvinimo mastai. Per pastarąjį dešimtmetį ungurių sugavimai Estijoje ir Latvijoje vidaus vandenyse sumažėjo beveik du kartus, o Lenkijoje 0,5 karto. Šiuo metu Lietuvoje ungurių žvejyba reguliuojama pagal kvotų, žvejybos įrankių, žvejybos sezonų, verslinio laimikio dydžio kontroliavimo sistemas. Kaimyninėse šalyse taikomi labai panašūs ungurių išteklių apsaugos būdai. Europos Bendrijų Komisija išleido paskutinį tarybos reglamentą (KOM (2005) 572), nustatantį priemones ungurių ištekliams atkurti. Pagrindinis reglamento elementas – parengti nacionalinius europinių ungurių išteklių valdymo planus, kuriuos taikydamos visos valstybės narės užtikrintų, kad 40 % užaugusių sidabrinių... [toliau žr. visą tekstą]
SUMMARY A steep decline in recruitment has occurred over most of the continent since the early 1980. In 2001, ICES announced European eel to be outside safe biological limits. Although several hypotheses have been brought forward as possible explanations of causes of this widespread decline, no unambiguous cause has been identified. This is mostly due to fishing at unsustainable levels, climate changes, pollution or habitat loss. Stock of European reduced in all Baltic countries, like in all European eel spread territory Eel landings in Lithuania is reduced in inland and territorial waters. Eel landings since 1982, deduced double in inland waters, and triple in Coronian lagoon. El stocking with glass eels or elvers reduced too. During the last decade eel landings from inland waters reduced double in Estonia and Latvia, while in Poland landings reduced 0,5 times. Eel commercial fishery in Lithuania is controlled by quotas, fishing gear, fishing seasons, commercial size system. In neighbour countries similar fishery control system is being used. Commission of the European communities presented proposal for a council regulation establishing measures for the recovery of the stock of European Eel. The main aspect is that each member country has to prepare management plan to ensure the escapement to sea for at least 40 % of the biomass of silver eel. For Lithuania it would be useful to maintain fishermen’s initiative to stock inland waters by silver eels or elvers, and in this way... [to full text]
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7

Guilherme, Sofia Isabel Antunes Gomes. "Genotoxic risk of herbicides to Anguilla anguilla L". Doctoral thesis, Universidade de Aveiro, 2012. http://hdl.handle.net/10773/10117.

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Doutoramento em Biologia
No contexto dos contaminantes aquáticos, os herbicidas são considerados como um dos grupos mais perigosos. Uma vez aplicados, estes são facilmente transportados para cursos de água, quer devido a uma pulverização pouco cuidada ou devido a fenómenos de escorrência superficial e/ou subterrânea. A presença destes agroquímicos no ambiente tem vindo a ser associada a efeitos nefastos em organismos não-alvo, como é o caso dos peixes. Contudo, existe ainda uma grande lacuna no que diz respeito à informação científica relacionada com o seu impacto genotóxico. Deste modo, a presente tese foi delineada com o intuito de avaliar o risco genotóxico em peixes de duas formulações de herbicidas: o Roundup®, que tem como princípio activo o glifosato, e o Garlon®, que apresenta o triclopir na base da sua constituição, produtos estes largamente utilizados na limpeza de campos agrícolas, assim como em florestas. Foi ainda planeado desenvolver uma base de conhecimento no que diz respeito aos mecanismos de dano do ADN. Como último objectivo, pretendeu-se contribuir para a mitigação dos efeitos dos agroquímicos no biota aquático, nomeadamente em peixes, fornecendo dados científicos no sentido de melhorar as práticas agrícolas e florestais. Este estudo foi realizado adoptando a enguia europeia (Anguilla anguilla L.) como organismo-teste, e submetendo-a a exposições de curta duração (1 e 3 dias) dos produtos comerciais mencionados, em concentrações consideradas ambientalmente realistas. Para a avaliação da genotoxicidade foram aplicadas duas metodologias: o ensaio do cometa e o teste das anomalias nucleares eritrocíticas (ANE). Enquanto o ensaio do cometa detecta quebras na cadeia do ADN, um dano passível de ser reparado, o aparecimento das ANE revela lesões cromossomais, sinalizando um tipo de dano de difícil reparação. O ensaio do cometa foi ainda melhorado com uma nova etapa que incluiu a incubação com enzimas de reparação (FPG e EndoIII), permitindo perceber a ocorrência de dano oxidativo no ADN. No que diz respeito ao Roundup®, o envolvimento do sistema antioxidante como indicador de um estado próoxidante foi também alvo de estudo. Uma vez que as referidas formulações se apresentam sob a forma de misturas, o potencial genotóxico dos seus princípios activos foi também avaliado individualmente. No caso particular do Roundup®, também foram estudados o seu surfactante (amina polietoxilada; POEA) e o principal metabolito ambiental (ácido aminometilfosfórico; AMPA). Os resultados obtidos mostraram a capacidade do Roundup® em induzir tanto dano no ADN (em células de sangue, guelras e fígado) como dano cromossómico (em células de sangue). A investigação sobre o possível envolvimento do stresse oxidativo demonstrou que o tipo de dano no ADN varia com as concentrações testadas e com a duração da exposição. Deste modo, com o aumento do tempo de exposição, os processos relacionados com o envolvimento de espécies reactivas de oxigénio (ERO) ganharam preponderância como mecanismo de dano no ADN, facto que é corroborado pela activação do sistema antioxidante observado nas guelras, assim como pelo aumento dos sítios sensíveis a FPG em hepatócitos. O glifosato e o POEA foram também considerados genotóxicos. O POEA mostrou induzir uma maior extensão de dano no ADN, tanto comparado com o glifosato como com a mistura comercial. Apesar de ambos os componentes contribuirem para a genotoxicidade da formulação, a soma dos seus efeitos individuais nunca foi observada, apontando para um antagonismo entre eles e indicando que o POEA não aumenta o risco associado ao princípio activo. Deste modo, realça-se a necessidade de regulamentar limiares de segurança para todos os componentes da formulação, recomendando, em particular, a revisão da classificação do risco do POEA (actualmente classificado com “inerte”). Uma vez confirmada a capacidade do principal metabolito do glifosato – AMPA – em exercer dano no ADN assim como dano cromossómico, os produtos da degradação ambiental dos princípios activos assumem-se como um problema silencioso, realçando assim a importância de incluir o AMPA na avaliação do risco relacionado com herbicidas com base no glifosato. A formulação Garlon® e o seu princípio activo triclopir mostraram um claro potencial genotóxico. Adicionalmente, o Garlon® mostrou possuir um potencial genotóxico mais elevado do que o seu princípio activo. No entanto, a capacidade de infligir dano oxidativo no ADN não foi demonstrada para nenhum dos agentes. No que concerne à avaliação da progressão do dano após a remoção da fonte de contaminação, nem os peixes expostos a Roundup® nem os expostos a Garlon® conseguiram restaurar completamente a integridade do seu ADN ao fim de 14 dias. No que concerne ao Roundup®, o uso de enzimas de reparação de lesões específicas do ADN associado ao teste do cometa permitiu detectar um aparecimento tardio de dano oxidativo, indicando deste modo um decaimento progressivo da protecção antioxidante e ainda uma incapacidade de reparar este tipo de dano. O período de pós-exposição correspondente ao Garlon® revelou uma tendência de diminuição dos níveis de dano, apesar de nunca se observar uma completa recuperação. Ainda assim, foi evidente uma intervenção eficiente das enzimas de reparação do ADN, mais concretamente as direccionadas às purinas oxidadas. A avaliação das metodologias adoptadas tornou evidente que o procedimento base do ensaio do cometa, que detecta apenas o dano nãoespecífico no ADN, possui algumas limitações quando comparado com a metodologia que incluiu a incubação com as enzimas de reparação, uma vez que a última mostrou reduzir a possibilidade de ocorrência de resultados falsos negativos. Os dois parâmetros adoptados (ensaio do cometa e teste das ANE) demonstraram possuir aptidões complementares, sendo assim recomendado a sua utilização conjunta com vista a efectuar uma avaliação mais adequada do risco genotóxico. Globalmente, os resultados obtidos forneceram indicações de grande utilidade para as entidades reguladoras, contribuindo ainda para a (re)formulação de medidas de conservação do ambiente aquático. Neste sentido, os dados obtidos apontam para a importância da avaliação de risco dos herbicidas incluir testes de genotoxicidade. A magnitude de risco detectada para ambas as formulações adverte para a necessidade de adopção de medidas restritivas em relação à sua aplicação na proximidade de cursos de água. Como medidas mitigadoras de impactos ambientais, aponta-se o desenvolvimento de formulações que incorporem adjuvantes selecionados com base na sua baixa toxicidade.
Herbicides are considered among the most hazardous contaminants of water bodies, since they easily reach these ecosystems through aerial spray drift, artificial drainage systems and surface or sub-surface runoff. The occurrence of these agrochemicals in the aquatic environment has been associated to deleterious effects in non-target organisms, namely fish. However, a considerable gap is evident regarding the scientific information on their genotoxic impact. Therefore, the present thesis was designed with the intention to evaluate the genotoxic risk to fish of the herbicide formulations Roundup® (glyphosate-based) and Garlon® (triclopyr-based), representing broadly used products worldwide to manage unwanted vegetation in agriculture and forestry. It was also planned to develop of a biologically base knowledge on DNA damage mechanisms. As ultimate goal, it was intended to contribute to mitigate the effects of agrochemicals in aquatic biota, namely fish, providing scientific data able to improve forestry and agriculture managing practices. The study was carried out adopting the European eel (Anguilla anguilla L.) as test organism and performing short-term exposures (1 and 3 days) to environmentally realistic concentrations of the mentioned commercial products. Two different genotoxic endpoints were adopted: comet and erythrocytic nuclear abnormalities (ENA) assays. The comet assay measures DNA stand breaks, a repairable type of damage, whereas the ENA assay identifies chromosomal lesions, signalizing a type of damage hardly repairable. The comet assay was also upgraded with an extra-step involving incubation with repair enzymes (FPG and EndoIII), in order to detect oxidative DNA damage. In what concerns to Roundup®, the involvement of the antioxidant system as indication of a pro-oxidant status was also assessed. Once the aforementioned formulations are presented as mixtures of chemicals, the genotoxic potential of their active ingredients individually was also assessed. In the case of Roundup®, the evaluation of the risk associated to the surfactant (polyethoxylated amine; POEA) and to the major environmental breakdown product of the active principle (aminomethylphosphonic acid; AMPA) was carried out as well. The results obtained showed the Roundup® ability to induce both DNA (in blood, gills and liver cells) and chromosomal damage (in blood cells). The investigation on the causative involvement of oxidative stress demonstrated that the type of DNA damage varies with tested concentrations and exposure duration. Thus, ROS-dependent processes gained preponderance as a mechanism of DNA damage with the increase of exposure length, which was corroborated by the antioxidant activation observed in gills as well as the net FPG-sensitive sites elevation detected in liver. Glyphosate and the surfactant POEA were also found to be genotoxic. Moreover, POEA induced the highest extent of DNA damage, when compared to glyphosate and the commercial mixture. Though both components showed to contribute to the overall genotoxicity of the herbicide formulation, the sum of their individual effects was never observed, pointing out an antagonistic interaction between them, indicating that POEA does not increase the risk associated to the active ingredient. These findings also emphasized the need to define regulatory thresholds for all the formulation components, recommending, in particular, the revision of the hazard classification of POEA (classified as “inert” until date). Since the ability of the main environmental metabolite of glyphosate - AMPA - in exert DNA and chromosomal damage was also confirmed, it was pointed out the silent problem that the products of environmental degradation of the active ingredients can constitute. In addition, the importance to include AMPA in risk assessment studies concerning the glyphosate-based herbicides was highlighted. The formulation Garlon® and its active ingredient triclopyr also showed a clear genotoxic potential. In addition, it was demonstrated the higher genotoxicity of the formulation, in comparison to the active ingredient. However, their ability in exert oxidative DNA damage could not be demonstrated. In what concerns to the evolution of the damage progression after removal of the contamination source, neither fish exposed to Roundup® nor Garlon® achieved a complete restoration of DNA integrity in 14 days. In relation to Roundup®, the use of the DNA lesion-specific repair enzymes allowed understanding the occurrence of a late oxidative DNA damage, indicating a progressive decay of cell antioxidant protection as well as the incapacity to repair this particular type of damage. The Garlon® post-exposure period revealed a tendency to decrease damage levels, although not enough to be regarded as an effective recovery. However, an efficient intervention of DNA repair enzymes specifically directed to oxidized purines became evident. Evaluating the performance of the adopted genotoxic endpoints, it was evident that the standard comet procedure, detecting only non-specific DNA damage, displayed some limitations when compared to the methodology that includes the incubation with the repair enzymes, since the latter reduced the possibility of false negative results. The two adopted endpoints (comet and ENA assays) demonstrated complementary aptitudes, being recommended their jointly application since it allows a more effective genotoxic risk assessment. Overall, the results obtained provided useful recommendations for policymaking, contributing to (re)formulate regulatory procedures for protecting the health of aquatic environment. In this direction, the data gathered in this work point to the importance of performing a genotoxic evaluation in order to actually determine the hazard posed by herbicides and their by-products. The magnitude of risk detected for both formulations strongly advise the adoption of restrictive measures in relation to their application in the proximity of watercourses. As mitigation measures, the development of formulations incorporating adjuvants selected on the basis of their lower toxicity emerged as a recommended path.
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8

Geffroy, Benjamin. "Déterminisme environnemental du sexe chez l’Anguille Européenne Anguilla anguilla". Thesis, Pau, 2012. http://www.theses.fr/2012PAUU3035/document.

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Contrairement à la majorité des mammifères, la plupart des poissons ne possèdent pas de chromosomes sexuels hétéromorphes (type XY/XX). Chez un grand nombre de poisson la labilité du sexe est extrêmement prononcée. Cela se traduit par le fait que le déterminisme du sexe peut être sous l’influence de variables environnementales. C’est le cas chez l’anguille où la proportion de mâle augmente avec le nombre d’individus présents en un lieu donné. Cette thèse a pour but de mieux comprendre les facteurs qui régissent la destiné sexuelle des individus. Ainsi, les relations inter-individuelles et la croissance ont été étudiées afin d’évaluer leur possible rôle dans le déterminisme du sexe. Les résultats acquis au cours de cette thèse suggèrent que la densité per se ne serait pas le facteur primordial influençant le déterminisme du sexe, mais plutôt l’estimation faite par les individus de la qualité du milieu
Contrarily to most mammals, the majority of fish doesn’t have heteromorphic sexual chromosomes (type XY/XX). In most fish, the gonad development is extremely labile and for some of them, the sex can be influenced/determined by environmental factors. This is observed in eel, where the proportion of males increases with the number of individuals at a given location. The goal of this thesis is to better understand processes that act upon sex determination in eel. Thus, inter-individual relationships as well as the growing potential of each fish were studied to evaluate their possible role in sex determination. The findings gathered throughout this thesis support the hypothesis of a metagametic (environmental) sex determination and also suggests that the estimation of the quality of the environment, made by juveniles’ eels, is one of the key factors influencing sex determination
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9

Durif, Caroline. "La migration d'avalaison de l'anguille européenne Anguilla anguilla : caractérisation des fractions dévalantes, phénomène de migration et franchissement d'obstacles". Toulouse 3, 2003. http://www.theses.fr/2003TOU30011.

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10

Filippi, Jean-José. "Étude parasitologique de Anguilla anguilla dans deux lagunes de Corse et étude ultrastructurale du tégument de trois digènes parasites de cette anguille". Phd thesis, Université Pascal Paoli, 2013. http://tel.archives-ouvertes.fr/tel-00819285.

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Une étude parasitaire de l'anguille d'Europe a été menée dans les lagunes de Biguglia et d'Urbino en Corse. La composition des communautés de parasites a été décrite. Treize espèces parasites ont été identifiées parmi lesquelles: trois digènes, Bucephalus anguillae, Deropristis inflata, Lecithochirium musculus; un monogène, Pseudodactylogyrus anguillae; trois cestodes, Bothriocephalus claviceps, Proteocephalus macrocephalus, Myzophyllobothrium sp. (larve); trois nématodes, Anguillicoloides crassus, Contracaecum sp. (larve enkystée), Goezia anguillae; un acanthocéphale, Acanthocephaloides incrassatus; un copépode, Ergasilus gibbus; et un myxozoaire, Myxobolus portucalensis. La présence d'espèces invasives, notamment le parasite branchial P. anguillae et le nématode parasite A. crassus, dans les lagunes corses est confirmée. Ces espèces, et particulièrement le monogène, présentent des valeurs épidémiologiques croissantes depuis les dernières études menées. Plusieurs espèces présentent des différences de prévalence significatives entre les deux lagunes. Des différences au niveau de la richesse spécifique et des valeurs de diversité, plus élevées pour les parasites des anguilles de la lagune d'Urbino au niveau intestinal métacommunautaire et infracommunautaire, ont été démontrées. Cependant les valeurs les plus élevées de diversité spécifique et les valeurs de dominance les plus basses ont été calculées pour les communautés parasitaires des anguilles de la lagune de Biguglia. Nous avons également mis en avant une diversité parasitaire spécifique plutôt faible chez les anguilles des lagunes corses par rapport aux autres lagunes d'Europe. Les communautés parasitaires de l'anguille d'Europe dans les lagunes de Biguglia et d'Urbino en Corse sont marquées par l'environnement de leur hôte. Une dépendance vis-à-vis de la salinité de la lagune a ainsi été démontrée. Les valeurs d'infestation les plus élevées ont été observées durant les saisons les plus chaudes de l'année pour la majorité des espèces parasites observées (B. anguillae, D. inflata, L. musculus, P. anguillae, P. macrocephalus, A. crassus, les kystes de Contracaecum sp., A. incrassatus et E. gibbus). Nous avons également démontré que l'état d'argenture et la taille ont une influence significative sur les taux d'infestation de sept espèces parasites (D. inflata, L. musculus, P. anguillae, P. macrocephalus, les kystes de Contracaecum sp., A. incrassatus et E. gibbus). La méthode de l'espèce indicatrice a confirmé que le site d'étude, la saison, l'état d'argenture ou la taille de l'anguille pouvait influer sur la présence de certaines espèces parasites. Le tégument de trois digènes parasites de l'anguille d'Europe, B. anguillae, L. musculus et D. inflata, a été étudié en microscopie électronique à balayage et à transmission. Nous avons démontré la présence de structures caractéristiques de l'organisation tégumentaire des digènes ainsi que de formations spécifiques, notamment au niveau de la structure des récepteurs sensoriels et des écailles.
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Più fonti

Libri sul tema "Anguilla"

1

Anguilla. Anguilla: Policy matrix. [Valley, Anguilla?: s.n., 1993.

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Bertoldini, Ornella. L'ultima peschiera: Storia e storie sulla pesca delle anguille a Castelletto Sopra Ticino. Verbania: Alberti libraio editore, 2005.

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3

Caribbean Development Bank. Economics and Programming Dept. Economic memorandum on Anguilla. [Kingston, Jamaica]: Economics and Programming Dept., 1985.

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4

Anguilla. Statistical Branch. Development & Planning Unit., a cura di. [Statistical data for Anguilla]. [The Valley, Anguilla]: Statistical Branch, Development & Planning Unit, 1987.

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Anguilla. The Constitution of Anguilla. [Valley, Anguilla: Printed at the Secretariat, 1990.

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Caribbean Tourism Research and Development Centre., a cura di. PMS-country report: Anguilla. Barbados, W.I: Caribbean Tourism Research and Development Centre, 1985.

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Rodgers, Bradley A. The 1996 Anguilla shipwreck survey: Anguilla, British West Indies, September 1996. Greenville, N.C: Program in Maritime Studies, East Carolina University, 2006.

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Anguilla. Statutes and regulations of Anguilla. [Anguilla]: Attorney General's Chambers, Government of Anguilla, 2001.

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Benjamin, John. Doing business in Anguilla B.W.I. [Anguilla?]: J. Benjamin, 1988.

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Petty, Colville L. A handbook history of Anguilla. Anguilla: Anguilla Printers, 1991.

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Capitoli di libri sul tema "Anguilla"

1

Diller, Susanna L., Casey D. Allen, Ayumi Kuramae e Donald M. Thieme. "Anguilla". In World Geomorphological Landscapes, 31–43. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-55787-8_4.

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Andrade, John. "Anguilla". In World Police & Paramilitary Forces, 6. London: Palgrave Macmillan UK, 1985. http://dx.doi.org/10.1007/978-1-349-07782-3_6.

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Hartley, Cathy. "Anguilla". In The Europa International Foundation Directory 2021, 6. 30a ed. London: Routledge, 2021. http://dx.doi.org/10.4324/9781003179870-5.

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Dufour, Sylvie, Elisabeth Burzawa-Gerard, Nadine Le Belle, Miskal Sbaihi e Bernadette Vidal. "Reproductive Endocrinology of the European Eel, Anguilla anguilla". In Eel Biology, 373–83. Tokyo: Springer Japan, 2003. http://dx.doi.org/10.1007/978-4-431-65907-5_25.

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Wynne, Stuart P. "Coral Reefs of Anguilla". In Coral Reefs of the World, 13–22. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-5965-7_2.

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Rankin, J. Cliff. "Acclimation to Seawater in the European Eel Anguilla anguilla: Effects of Silvering". In Spawning Migration of the European Eel, 129–45. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-1-4020-9095-0_6.

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Knights, B. "Enhancing Stocks of European Eel, Anguilla anguilla, to Benefit Bittern, Botaurus stellaris". In Interactions Between Fish and Birds: Implications for Management, 298–313. Oxford, UK: Blackwell Publishing Ltd, 2007. http://dx.doi.org/10.1002/9780470995372.ch22.

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"European Eel (Anguilla anguilla)". In The Adriatic Sea Encyclopedia, 124–26. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-50032-0_181.

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"European Eel (Anguilla anguilla)". In Encyclopedia of Seas, 79–80. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-08206-1_50013.

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"Anguilla". In National Accounts Statistics: Main Aggregates and Detailed Tables, 2011 (Five-Volume Set), 38–42. UN, 2012. http://dx.doi.org/10.18356/4b0f4daa-en.

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Atti di convegni sul tema "Anguilla"

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Filipenko, Sergey, e Mihail Mustea. "About the European Eel Anguilla Anguilla (Linnaeus, 1758) of the Dniester River". In Xth International Conference of Zoologists. Institute of Zoology, Republic of Moldova, 2021. http://dx.doi.org/10.53937/icz10.2021.19.

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The presence of the European eel Anguilla anguilla in the Dniester River has been reliably established. In May 2021, an European eel 94.5 cm long and 1400 g in weight was caught in the Dniester River near Tiraspol.
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Monteiro, Rui, Bernardo R. Quintella, Pedro R. Almeida, José Lino Costa, Esmeralda Pereira, Ana Filipa Belo, Teresa Portela et al. "Environmental Factors Promoting Upstream Movement of Yellow Eel (Anguilla anguilla L.) in the Mondego River". In SIBIC 2022. Basel Switzerland: MDPI, 2022. http://dx.doi.org/10.3390/blsf2022013112.

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HU, WENRONG, BINGANG TONG e HAO LIU. "A NUMERICAL STUDY ON FLUID DYNAMICS OF BACKWARD AND FORWARD SWIMMING IN THE EEL ANGUILLA ANGUILLA". In Advances in Engineering Mechanics - Reflections and Outlooks - In Honor of Theodore Y.-T. Wu. WORLD SCIENTIFIC, 2005. http://dx.doi.org/10.1142/9789812702128_0037.

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Nettles, Sandy, e Bret Jarrett. "Geophysical Mapping of Fountain Cave Anguilla, BWI". In Symposium on the Application of Geophysics to Engineering and Environmental Problems 2012. Environment and Engineering Geophysical Society, 2012. http://dx.doi.org/10.4133/1.4721725.

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Nettles, Sandy. "Temenos Estates, Anguilla, BWI Hydrogeologic Investigation, Geophysical Mapping and Water Supply Development". In Symposium on the Application of Geophysics to Engineering and Environmental Problems 2005. Environment and Engineering Geophysical Society, 2005. http://dx.doi.org/10.4133/1.2923516.

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Bahadoorsingh, S., R. Ramdathsingh e C. Sharma. "Integrating wind energy in a Caribbean island: A case study of Anguilla". In 2012 IEEE/PES Transmission and Distribution Conference and Exposition (T&D). IEEE, 2012. http://dx.doi.org/10.1109/tdc.2012.6281564.

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Nettles, Sandy. "Temenos Estates, Anguilla, Bwi Hydrogeologic Investigation, Geophysical Mapping and Water Supply Development". In 18th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems. European Association of Geoscientists & Engineers, 2005. http://dx.doi.org/10.3997/2214-4609-pdb.183.633-642.

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Zhang, Xinhai, Xiaomei Xu, Xinbing Tu, Wenpeng Wang e Yougan Chen. "Preliminary exploration of underwater noise impact on Japanese eel (Anguilla japonica) elvers". In 2016 IEEE/OES China Ocean Acoustics (COA). IEEE, 2016. http://dx.doi.org/10.1109/coa.2016.7535791.

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Hananya, Ariel, e Bambang Retnoaji. "Vertebral column study on glass and elver eel of Anguilla bicolor (McClelland, 1844)". In THE 6TH INTERNATIONAL CONFERENCE ON BIOLOGICAL SCIENCE ICBS 2019: “Biodiversity as a Cornerstone for Embracing Future Humanity”. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0015703.

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Windihastuty, Wiwin, e Dwi Kristanto. "E-learning design model integrated eel (Anguilla Sp.) in Indonesia based on Website". In 2017 10th International Conference on Human System Interactions (HSI). IEEE, 2017. http://dx.doi.org/10.1109/hsi.2017.8005008.

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Rapporti di organizzazioni sul tema "Anguilla"

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Griffioen, A. B., e K. Schilder. Aalonderzoeken Hoogheemraadschap van Delfland: groei en verspreiding van rode aal (Anguilla anguilla) 2018. IJmuiden: Wageningen Marine Research, 2018. http://dx.doi.org/10.18174/464153.

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Griffioen, A. B. Aalonderzoek Hoogheemraadschap van Delfland: groei en verspreiding van rode aal (Anguilla anguilla) 2019. IJmuiden: Wageningen Marine Research, 2019. http://dx.doi.org/10.18174/509538.

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Griffioen, A. B. Aalonderzoek Hoogheemraadschap van Delfland: groei en verspreiding van rode aal (Anguilla anguilla) 2020 : een datarapportage. IJmuiden: Wageningen Marine Research, 2020. http://dx.doi.org/10.18174/535183.

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Griffioen, A. B. Aalonderzoek Hoogheemraadschap van Delfland: groei en verspreiding van rode aal (Anguilla anguilla) 2021 : Data rapportage. IJmuiden: Wageningen Marine Research, 2021. http://dx.doi.org/10.18174/555595.

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Griffioen, A. B., e E. Melis. Aalonderzoek Hoogheemraadschap van Delfland: groei en verspreiding van rode aal (Anguilla anguilla) 2022 : Data rapportage. IJmuiden: Wageningen Marine Research, 2022. http://dx.doi.org/10.18174/579517.

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van der Hammen, T., F. Soudijn, J. Volwater, J. C. van Rijssel, A. B. Griffioen, C. Chen e H. V. Winter. European Eel (Anguilla anguilla) stock size, anthropogenic mortality and silver eel escapement in the Netherlands 2006-2020. IJmuiden: Stichting Wageningen Research, Centre for Fisheries Research (CVO), 2021. http://dx.doi.org/10.18174/556153.

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Griffioen, A. B. Aalonderzoeken Hoogheemraadschap van Delfland: groei en verspreiding van rode aal (Anguilla anguilla) : Een voortgangsrapportage van het merk terugvangst experiment met behulp van fuiken en PITtags. IJmuiden: Wageningen Marine Research, 2018. http://dx.doi.org/10.18174/464159.

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Griffioen, A. B., T. Wilkes, W. Janssen e T. Menke. Glass eel (Anguilla anguilla) predation risk byEuropean sea bass (Dicentrarchus labrax) in the lab. : Have VIE-tagged glass eels an increased predation risk? : how long can glass eels be detected in the stomach of a Sea bass? IJmuiden: Stichting Wageningen Research, Centre for Fisheries Research (CVO), 2020. http://dx.doi.org/10.18174/536393.

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Jacobson, Birgitta. Faktorer som påverkar dödlighet hos ål vid fångst och transport förbi kraftverk. Institutionen för akvatiska resurser, Sveriges lantbruksuniversitet, 2022. http://dx.doi.org/10.54612/a.103nhc2ns8.

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Den europeiska ålen (Anguilla anguilla) klassas idag som akut hotad. En anledning till att den minskat i antal är på grund av vandringshinder, så som vattenkraftverk, som påverkar ålens upp- och nedströmsvandring på ett negativt sätt. Vattenkraften blockerar vandringsvägar och leder till ökad mortalitet då lekvandrande ål har svårt att överleva passagen genom vattenkraftens snurrande turbiner under sin vandring från sötvatten till havet. En åtgärd för att minska mortaliteten i turbinerna är att man fångar och transporterar ål med lastbil förbi vandringshindren. Fångst och transport går till så att ål fångas ovanför vattenkraftverken och förvaras i sump, för att sedan köras med bil eller lastbilstransport förbi vattenkraftverken för att sedan släppas ut. Syftet med denna rapport är att undersöka vilka faktorer som påverkar dödlighet hos ål under fångst och transport, så kallad Trap & Transport. Data i denna studie kommer från Svenska Insjöfiskarenas Centralförbund (SIC), där fiskare tillsammans med transportör har fört protokoll över fångst och transport under åren 2013-2022. Faktorer som vattentemperatur, tid i sump och transporttid testades mot dödlighet. Totalt dog det få ålar under fångst och transport (0,78 %) men vid vissa fångster och transporttillfällen var dödligheten så hög som 10 %. Enligt resultaten är det generellt hög vattentemperatur i kombination med lång sumpningstid som bör undvikas för att minska antalet ål som dör under fångst och transport.
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Jacobson, Birgitta, Håkan Wickström, Jennie Strömquist e John Persson. Ålmärkningsprojekt i sjön Ymsen : sammanställning av data från 1998–2022. Department of Aquatic Resources, Swedish University of Agricultural Sciences, 2024. http://dx.doi.org/10.54612/a.1bbflv35va.

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Denna rapport sammanställer information om märkningsprojekt med ål (Anguilla anguilla) utförda i sjön Ymsen. Märkningsexperimenten utfördes åren 1998–2002 samt 2012. Data över återfångster samlas in kontinuerligt, en insamling som pågår än idag (år 2023). Denna rapport innehåller data insamlad fram till och med år 2022. Syftet med rapporten är både att sammanfatta vad som har gjorts och att redogöra för vilka data som finns tillgängliga för framtida projekt. Följande märkningsprojekt har utförts i sjön: • År 1998 utfördes en mindre inledande testmärkning med PIT-tags på ålyngel, 190 märkta ålar sattes ut. • År 1999 utfördes ytterligare en testmärkning med PIT-tags, denna gång märktes 83 gulålar. • År 1999–2002 utfördes märkningsexperiment för att undersöka om strontiummärkning (Sr) fungerar för att skilja utsatt från naturligt förekommande ål. Totalt sattes 17 768 Sr-märkta ålar ut, varav 2 627 även var märkta med PIT-tags (PIT-tags användes år 1999 och 2000). Av de som både var Sr och PIT-tag märkta så har 334 återfångats (till och med 2022) och resultaten visade att strontium fungerade bra för att märka ål. • År 2004 undersökte man skarvens påverkan som predator på ål genom att söka efter PIT-tags (från märkningarna som utfördes 1999 och 2000) i en skarvkoloni. Totalt 30 PIT-tag märken återfanns i skarvkolonin. • År 2012 utfördes ett märkningsexperiment där 118 gulålar märktes med PIT-tags och Carlinmärken för att undersöka om förlust av Carlinmärken förekom. Av de 65 ålar som återfångats (till och med 2016) hade en förlorat sitt Carlinmärke. Data över utsättningar och återfångster finns lagrade på Sötvattenslaboratoriet server, och/eller i databasen ”Sötebasen” (som hanteras av Sveriges lantbruksuniversitet, institutionen för akvatiska resurser, SLU Aqua)
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