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Zeitschriftenartikel zum Thema „Eels“

Autor: Grafiati

Veröffentlicht am 4. Juni 2021

Zuletzt aktualisiert am 25. Juli 2025

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1

Catania, Kenneth C. "An Optimized Biological Taser: Electric Eels Remotely Induce or Arrest Movement in Nearby Prey." Brain, Behavior and Evolution 86, no. 1 (2015): 38–47. http://dx.doi.org/10.1159/000435945.

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Despite centuries of interest in electric eels, few studies have investigated the mechanism of the eel's attack. Here, I review and extend recent findings that show eel electric high-voltage discharges activate prey motor neuron efferents. This mechanism allows electric eels to remotely control their targets using two different strategies. When nearby prey have been detected, eels emit a high-voltage volley that causes whole-body tetanus in the target, freezing all voluntary movement and allowing the eel to capture the prey with a suction feeding strike. When hunting for cryptic prey, eels emi

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Tambets, Meelis, Einar Kärgenberg, Ain Järvalt, et al. "Migrating silver eels return from the sea to the river of origin after a false start." Biology Letters 17, no. 9 (2021): 20210346. http://dx.doi.org/10.1098/rsbl.2021.0346.

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The European eel's singular spawning migration from European waters towards the Sargasso Sea remains elusive, including the early phase of migration at sea. During spawning migration, the movement of freshwater resident eels from river to sea has been thought to be irreversible. We report the first recorded incidents of eels returning to the river of origin after spending up to a year in the marine environment. After migrating to the Baltic Sea, 21% of the silver eels, tagged with acoustic transmitters, returned to the Narva River. Half returned 11–12 months after moving to the sea, with 15 km

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Shuai, Fangmin, Xinhui Li, Wanling Yang, Weitao Chen, and Sovan Lek. "Habitat use of the Japanese eel (Anguilla japonica) and marbled eel (Anguilla marmorata) in the large subtropical Pearl River." Annales de Limnologie - International Journal of Limnology 57 (2021): 8. http://dx.doi.org/10.1051/limn/2021001.

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Anguilla spp. are catadromous fish and with a high economic value in Asia. The Pearl River is the largest river in southern China and is an important area for wild populations of Anguilla spp. However, until now, there has been little research on the eel's population structure and habitat use in the Pearl River. This study analyzed the population structure and habitat use characteristics of the Japanese eel (Anguilla japonica) and the marbled eel (Anguilla marmorata) in the Pearl River based on data collected from 2015 to 2018. A total of 181 Japanese eels and 56 marbled eels were collected, o

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MÜLLER, ULRIKE K., JORIS SMIT, EIZE J. STAMHUIS, and JOHN J. VIDELER. "HOW THE BODY CONTRIBUTES TO THE WAKE IN UNDULATORY FISH SWIMMING." Journal of Experimental Biology 204, no. 16 (2001): 2751–62. http://dx.doi.org/10.1242/jeb.204.16.2751.

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SUMMARY Undulatory swimmers generate thrust by passing a transverse wave down their body. Thrust is generated not just at the tail, but also to a varying degree by the body, depending on the fish's morphology and swimming movements. To examine the mechanisms by which the body in particular contributes to thrust production, we chose eels, which have no pronounced tail fin and hence are thought to generate all their thrust with their body. We investigated the interaction between body movements and the flow around swimming eels using two-dimensional particle image velocimetry. Maximum flow veloci

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Catania, Kenneth C. "Electrical Potential of Leaping Eels." Brain, Behavior and Evolution 89, no. 4 (2017): 262–73. http://dx.doi.org/10.1159/000475743.

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When approached by a large, partially submerged conductor, electric eels (Electrophorus electricus) will often defend themselves by leaping from the water to directly shock the threat. Presumably, the conductor is interpreted as an approaching terrestrial or semiaquatic animal. In the course of this defensive behavior, eels first make direct contact with their lower jaw and then rapidly emerge from the water, ascending the conductor while discharging high-voltage volleys. In this study, the equivalent circuit that develops during this behavior was proposed and investigated. First, the electrom

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Pereira, Luís, Ana Catarina Braga, Ana Moura, and Carlos Antunes. "PREVALENCE OF THE Anguillicola crassus PARASITE IN THE INTERNATIONAL MINHO RIVER." ENVIRONMENTAL SMOKE, Special Issue (March 31, 2022): 64–74. http://dx.doi.org/10.32435/envsmoke/xibesymp.10.

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The European eel, Anguilla anguilla (Linnaeus, 1758), is vulnerable to infections by the parasitic nematode Anguillicola crassus Kuwahara, Niimi & Itagaki, 1974, mainly in freshwater ecosystems. The eel is a bioindicator species due to its benthic behaviour, predator, and life cycle. The parasite feeds on blood from the eel's swim bladder, causing damage to the walls and deterioration of this organ, reducing energy reserves, and affecting its migratory capacity for reproduction. Eels were captured at different sampling points divided into 4 areas of the international section of the Minho R

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Bakke, T. A., P. A. Jansen, and L. P. Hansen. "Experimental transmission of Gyrodactylus salaris Malmberg, 1957 (Platyhelminthes, Monogenea) from the Atlantic salmon (Salmo salar) to the European eel (Anguilla anguilla)." Canadian Journal of Zoology 69, no. 3 (1991): 733–37. http://dx.doi.org/10.1139/z91-105.

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Laboratory experiments were designed as follows in an attempt to evaluate the potential importance of eels in dispersal of Gyrodactylus salaris: exposure of uninfected eels to infected salmon; exposure of infected eels to uninfected salmon; exposure of uninfected eels to infected eels; indirect infection of uninfected eels; parasite transmission preference, using "two-choice" host tests; and parasite survival on eels following their isolation. Gyrodactylus salaris was found to be transmissible from salmon to eels, and vice versa, both at 4 and 13 °C. Eel to eel transfer of G. salaris was also

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Tsuchida, Takamasa, and Yoshio Takei. "Effects of homologous atrial natriuretic peptide on drinking and plasma ANG II level in eels." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 275, no. 5 (1998): R1605—R1610. http://dx.doi.org/10.1152/ajpregu.1998.275.5.r1605.

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The effects of eel atrial natriuretic peptide (ANP) on drinking were investigated in eels adapted to freshwater (FW) or seawater (SW) or in FW eels whose drinking was stimulated by a 2-ml hemorrhage. An intra-arterial infusion of ANP (0.3–3.0 pmol ⋅ kg−1 ⋅ min−1), which increased plasma ANP level 1.5- to 20-fold, inhibited drinking dose dependently in all groups of eels. The drinking rate recovered to the level before ANP infusion within 2 h after infusate was replaced by saline. The inhibition at 3.0 pmol ⋅ kg−1 ⋅ min−1was profound in FW eels and hemorrhaged FW eels, whereas significant drink

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Sasai, Seiji, Toyoji Kaneko, Sanae Hasegawa, and Katsumi Tsukamoto. "Morphological alteration in two types of gill chloride cells in Japanese eels (Anguilla japonica) during catadromous migration." Canadian Journal of Zoology 76, no. 8 (1998): 1480–87. http://dx.doi.org/10.1139/z98-072.

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Gill chloride cell morphology and Na+,K+-ATPase activity were examined in cultured Japanese eels (Anguilla japonica) acclimated to fresh water (FW) or seawater (SW), and in yellow and silver eels caught in wild stocks. Gill Na+,K+-ATPase activity was higher in SW-acclimated cultured eels than in FW eels. Chloride cells were detected in both filament and lamellar epithelia by immunocytochemical staining using anti-Na+,K+-ATPase serum. The filament chloride cells were more abundant and larger in SW eels than in FW eels, whereas there was no apparent difference in lamellar chloride cells. In wild

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Demirci, Aydın. "Evaluating Silvering Stages in European Eels: A Study on Biological and Morphometric Variations in the Asi River, Türkiye." Fishes 9, no. 12 (2024): 479. http://dx.doi.org/10.3390/fishes9120479.

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The European eel (Anguilla anguilla) undergoes significant morphological and physiological changes during its transition from the yellow to the silver stage, which are critical for its long-distance spawning migration. This study aimed to investigate these changes in European eels from the Asi River, located in Hatay, Türkiye, during their silvering process. A total of 96 eels were sampled in February 2019, and various morphometric measurements, including total length, body weight, eye dimensions and height, and pectoral fin lengths, were taken. Liver and gonad weights were also measured to as

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Kautsari, Neri, Husain Latuconsina, and Ilham Zulfahmi. "Preliminary Study of Eels (Anguilla) in Sumbawa Island According to the Knowledge of Local Communities: Distributions, Pattern of Fishing, and Utilizations." Jurnal Ilmiah Perikanan dan Kelautan 15, no. 1 (2023): 212–23. http://dx.doi.org/10.20473/jipk.v15i1.34905.

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Highlight Research The biodiversity, distribution and capture of eels on Sumbawa Island are traced through local community knowledge There are four types of eels in Sumbawa, namely marmorata, A. celebensis, A. interioris, A. bicolor Eels are found in rivers, dams, estuaries and rice fields Eel is not the main catch Eel fishing by the community is carried out because the hobby of fishing is not for livelihood In general, people do not know about eel conservation in Indonesia Abstract Eels are an important fishery resource in Indonesia, but information regarding distribution, fishing patterns an

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Feunteun, Eric, Anthony Acou, Pascal Laffaille, and Antoine Legault. "European eel (Anguilla anguilla): prediction of spawner escapement from continental population parameters." Canadian Journal of Fisheries and Aquatic Sciences 57, no. 8 (2000): 1627–35. http://dx.doi.org/10.1139/f00-096.

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This paper describes the assessment of silver European eel (Anguilla anguilla) escapement based on a "sedentary" population fraction analysis in a 60-km2 watershed of northern Brittany (France). Downstream migration fluxes were monitored using eel traps and related to environmental factors. Intensive electrofishing and fyke-net fishing were conducted to assess eel biomass, densities, and population structure. A total of 564 eels, including 81 silver eels, were PIT tagged. In 1996, 616 eels were caught in the catchment including 68 silver eels (11%). During the following downstream migration pe

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Parker, Steven J., and James D. McCleave. "Selective Tidal Stream Transport by American Eels During Homing Movements and Estuarine Migration." Journal of the Marine Biological Association of the United Kingdom 77, no. 3 (1997): 871–89. http://dx.doi.org/10.1017/s0025315400036237.

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Behaviour during homing movements and downstream migration of yellow- and silver-phase American eels (Anguilla rostrata) was observed using continuous ultrasonic telemetry in a tidal estuary. Homing subadult (yellow-phase) eels, non-displaced yellow-phase eels and adult (silver-phase) eels all used tidal currents as a transport mechanism (‘selective tidal stream transport’) and possibly as a means of orienting and moving in an appropriate direction. Yellow-phase eels displaced up the estuary and migrating silver-phase eels moved mostly at night and during ebbing tides. Yellow-phase eels displa

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Indrawati, Ayuningtyas, Putri Sapira Ibrahim, Fione Yukita Yalindua, et al. "Species Composition and Inshore Migration of the Tropical Glass Eels (<i>Anguilla</i> spp.) Recruiting to the Jali River, Purworejo Regency." Journal of Tropical Biodiversity and Biotechnology 9, no. 2 (2024): 82880. http://dx.doi.org/10.22146/jtbb.82880.

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Purworejo Regency is located in the south coast of Java where rivers flow into the Indian Ocean. The Jali River in Purworejo becomes a migration route for eels where juvenile eels (glass eels) move from the ocean to freshwater passing through the estuary. During migration, glass eels will make efforts to survive, one of which is to manage their osmotic pressure (osmolarity). With regards to those, a study on the upstream migration of glass eels in Jali River was carried out. Glass eels samplings were conducted using hand-held lift nets at the new moon phase, from 20:00 pm to 4:00 am. Sampling

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Kaifu, Kenzo, Hikaru Itakura, Yosuke Amano, et al. "Discrimination of wild and cultured Japanese eels based on otolith stable isotope ratios." ICES Journal of Marine Science 75, no. 2 (2017): 719–26. http://dx.doi.org/10.1093/icesjms/fsx173.

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Abstract We successfully discriminated wild and cultured anguillid eels without artificial tagging. For the purpose of population restoration of anguillid eels, stocking has been widely conducted in the European Union (EU) and Japan, although the net benefits of stocking remain unclear. To evaluate the effectiveness of eel stocking for population restoration, the survival, growth, escapement, and reproduction of stocked eels should be tracked. In this study, we explored the potential of using otolith oxygen and carbon stable isotope ratios as a natural tag to discriminate between wild and cult

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Barreto, Rodrigo Egydio, Maria Fernanda Coelho Junqueira, Tan Tjui-Yeuw, and Gilson Luiz Volpato. "Spatial choice is biased by chemical cues from conspecifics in the speckeled worm eel Myrophis punctatus." Neotropical Ichthyology 8, no. 4 (2010): 899–902. http://dx.doi.org/10.1590/s1679-62252010005000011.

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The speckeld worm eel Myrophis punctatus lives in high-densities assemblages, and usually digs through, or lies on the substrate. These behaviours could lead to chemical marks on the substrate and could modulate the spatial distribution in this species. We tested the hypothesis that the spatial choice of the speckled worm eel is modulated by the presence of conspecific odour on the substrate. Here, we showed that the speckled worm eel avoids the substrate area containing the conspecific odour, indicating that this chemical cue modulates the eel's spatial decision. The eels clearly detected the

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Dutil, J. D., M. Michaud, and A. Giroux. "Seasonal and diel patterns of stream invasion by American eels (Anguilla rostrata) in the northern Gulf of St. Lawrence." Canadian Journal of Zoology 67, no. 1 (1989): 182–88. http://dx.doi.org/10.1139/z89-024.

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Seasonal and diel patterns of stream invasion by American eels (Anguilla rostrata) were monitored in a small stream located on the north shore of the Gulf of St. Lawrence from 1981 to 1985. Glass eels and elvers migrated from the sea in late June and July. Glass eels made up only a small percentage of the migrants. Pigmentation progressed quickly in the estuary, but elvers grew very slowly. Migration from the estuary and through the lower reaches of the stream was slow; no glass eels or elvers occurred at a station located only 4 km from saltwater. Juvenile eels reached that station in their s

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Barbin, Gayle P. "The role of olfaction in homing and estuarine migratory behavior of yellow-phase American eels." Canadian Journal of Fisheries and Aquatic Sciences 55, no. 3 (1998): 564–75. http://dx.doi.org/10.1139/f97-274.

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The role of olfaction in homing migrations of American eels (Anguilla rostrata) was examined in the Penobscot Estuary, Maine, U.S.A. Ultrasonic telemetry was used to track continuously (65 ± 12 h) 16 yellow eels displaced from a capture site. Four eels were not treated, eight rendered anosmic, and four rendered partially anosmic. All normal, only three anosmic, and two partially anosmic eels homed. Normal eels expressed a singular behavioral pattern, selective tidal stream transport (STST). STST was also displayed by three anosmic eels and one partially anosmic eel. Three alternative behaviora

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Payne, Gregory W., and Bruce B. Collette. "Novel Eels." BioScience 40, no. 2 (1990): 76. http://dx.doi.org/10.2307/1311335.

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Cowgill, M. A. "Sold Eels." Colorado Review 47, no. 2 (2020): 46–47. http://dx.doi.org/10.1353/col.2020.0069.

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JACOBY, MITCH. "ULTRAFAST EELS." Chemical & Engineering News 87, no. 28 (2009): 9. http://dx.doi.org/10.1021/cen-v087n028.p009.

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Williamson, Michael J., Charlotte Pike, Matthew Gollock, David M. P. Jacoby, and Adam T. Piper. "Anguillid eels." Current Biology 33, no. 17 (2023): R888—R893. http://dx.doi.org/10.1016/j.cub.2023.07.044.

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Hanke, Gavin F., and Steven M. Roias. "First Specimens of the Marine Eels Venefica ocella and V. tentaculata (Nettastomatidae) from British Columbia." Canadian Field-Naturalist 126, no. 3 (2013): 210. http://dx.doi.org/10.22621/cfn.v126i3.1362.

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Until recently, only the following seven species of marine eels were known to exist in waters off British Columbia (based on literature sources and museum records): Nemichthys scolopaceus, and Avocettina infans (Nemichthyidae, snipe eels), Xenomystax atrarius (Congridae, conger eels), Serrivomer jesperseni (Serrivomeridae, sawtooth eels), Cyema atrum (Cyematidae, bobtail eels), Synaphobranchus affinis (Synaphobranchidae, cutthroat eels), and Thalassenchelys coheni (Colocongridae, worm eels). Histiobranchus bathybius (also in the Synaphobranchidae) is expected to occur in British Columbia, sinc

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Budiharjo, Agung, Tjut Sugandawaty Djohan, Djumanto Djumanto, and Jusup Subagja. "UMUR GLAS EEL (Anguilla spp.) YANG MASUK MUARA SUNGAI PROGO, YOGYAKARTA." Berkala Penelitian Hayati 14, no. 2 (2009): 179–83. http://dx.doi.org/10.23869/bphjbr.14.2.200910.

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The leptocephalus drift with sea currents and moving from spawning area into coastal area near mouth of Progo River. In the coastal area, leptocephalus metamorfosed into glass eel, after that glass eel migrated to river. The aims of this research were to estimate glass eels age and predict hatching dates. Glass eels sampled on new moon during Februari 2007–Mei 2009 at mouth of Progo River. Glass eel ages estimated using their otolith microstructure. Hatching dates predicted with back calculation of glass eels age. We collected 1.082 glass eels. The ages of glass eel at recruit ranged from 58 t

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Helfman, Gene S. "Diel Distribution and Activity of American Eels (Anguilla rostrata) in a Cave-Spring." Canadian Journal of Fisheries and Aquatic Sciences 43, no. 8 (1986): 1595–605. http://dx.doi.org/10.1139/f86-198.

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American eels (Anguilla rostrata) in a Florida cave-spring (total population [Formula: see text] 142 eels, density [Formula: see text] 0.03 eels/m2) showed distinctive day versus night differences in distribution and activity. Larger eels occurred deeper at all times. Eels were diurnally quiescent, nocturnally active, and changed over between behavior modes roughly at dusk and dawn, although considerable variability existed in timing of changeover. Changeover at dusk involved movement from deeper regions of low food to shallower regions of high food concentration, with smaller eels more likely

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Arai, Takaomi, Aya Kotake, and Madoka Ohji. "Variation in migratory history of Japanese eels, Anguilla japonica, collected in the northernmost part of its distribution." Journal of the Marine Biological Association of the United Kingdom 88, no. 5 (2008): 1075–80. http://dx.doi.org/10.1017/s0025315408001756.

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In order to examine the variation of migratory histories in the Japanese eel, Anguilla japonica, we measured otolith strontium (Sr) and calcium (Ca) concentrations by X-ray electron microprobe analysis in A. japonica collected in a coastal brackish water lake in the northernmost part of its distribution. Two migratory types that were categorized as river eels and estuarine eels were found. Estuarine eels were dominant (85%), while ordinary diadromous eels that had entered the freshwater habitat made up only 15% of the population. The low proportion of river eels suggested that the estuarine ee

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Honda, Satoshi, Dina Muthmainnah, Ni Komang Suryati, et al. "CURRENT STATUS AND PROBLEMS OF THE CATCH STATISTICS ON ANGUILLID EEL FISHERY IN INDONESIA." Marine Research in Indonesia 41, no. 1 (2016): 1–14. http://dx.doi.org/10.14203/mri.v41i1.94.

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To compensate the decline of the populations of temperate anguillid eels, tropical anguillid eels become getting attention of East Asian eel market in recent years. Many eel farms have been established in Java Island to culture tropical anguillid eels intending to export the products to East Asia. Since eel farming is reliant on wild-caught anguillid eels such as glass eels, elvers and yellow eels, these eel seeds have been captured in various places in Indonesia. However, it is still unknown that how much of tropical anguillid eels are caught as seeds for eel farming. This study showed two di

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Béguer-Pon, Mélanie, Martin Castonguay, José Benchetrit, et al. "Large-scale migration patterns of silver American eels from the St. Lawrence River to the Gulf of St. Lawrence using acoustic telemetry." Canadian Journal of Fisheries and Aquatic Sciences 71, no. 10 (2014): 1579–92. http://dx.doi.org/10.1139/cjfas-2013-0217.

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Downstream migration of silver American eels (Anguilla rostrata) from the St. Lawrence system was examined using acoustic telemetry. One hundred and thirty six silver American eels were tagged, and their passage was recorded using fixed acoustic arrays covering a 420 km distance along the St. Lawrence River and Estuary. Eighty-nine percent of the tagged eels were detected. All migrant eels (111) exhibited unidirectional and downstream movements, but the migration was not completed in one continuous direct movement. High individual variability in migratory longitudinal profiles was documented a

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Warshafsky, Zoemma T., Troy D. Tuckey, Wolfgang K. Vogelbein, Robert J. Latour, and Andrew R. Wargo. "Temporal, spatial, and biological variation of nematode epidemiology in American eels." Canadian Journal of Fisheries and Aquatic Sciences 76, no. 10 (2019): 1808–18. http://dx.doi.org/10.1139/cjfas-2018-0136.

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American eels (Anguilla rostrata) are infected by the non-native parasitic nematode Anguillicoloides crassus, which can cause severe swim bladder damage. We investigated epidemiology of A. crassus to better understand its population-level effects on American eels. Nematode prevalence, abundance, and intensity and swim bladder damage were quantified in glass eels, elvers, and yellow eels from the lower Chesapeake Bay and related to season of capture, river system, and total length. Age-variant force-of-infection and disease-associated mortality were estimated using a three-state irreversible di

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Ely, Taylor, Nathaniel Patten, Lewis C. Naisbett-Jones, Erin T. Spencer, Demian A. Willette, and Peter B. Marko. "Molecular identification of critically endangered European eels (Anguilla anguilla) in US retail outlets." PeerJ 11 (February 6, 2023): e14531. http://dx.doi.org/10.7717/peerj.14531.

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The European eel (Anguilla anguilla) has declined by over 90% since the early 1980s and has been listed as critically endangered. Yet, despite strict export bans from the European Union, the European eel is still sold illegally in many countries. Efforts to monitor the trade of European eels have been primarily concentrated in Asian markets where concerningly high rates of European eel have been reported. Comparably fewer studies have assessed the identities of eel samples from the United States (US), despite the obvious implications for eel conservation. To address this knowledge gap, we purc

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Itakura, Hikaru, and Ryoshiro Wakiya. "Habitat preference, movements and growth of giant mottled eels, Anguilla marmorata, in a small subtropical Amami-Oshima Island river." PeerJ 8 (November 3, 2020): e10187. http://dx.doi.org/10.7717/peerj.10187.

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Although anguillid eel populations have decreased remarkably in recent decades, few detailed ecological studies have been conducted on tropical eels such as the giant mottled eel whose range extends across the whole Indo-Pacific. This species was studied throughout the entire 0.5 km mainstem reaches of Oganeku River on the subtropical Amami-Oshima Island of Japan over a two-year period using four sampling periods to understand its habitat preference, early life-stage dispersal process, movements, and annual growth using a mark-recapture experiment conducted with quantitative electrofishing. A

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Watanabe, Shigeru, and Kazutaka Shinozuka. "Spatial learning in Japanese eels (Anguilla japonica)." Animal Cognition 23, no. 1 (2019): 233–36. http://dx.doi.org/10.1007/s10071-019-01320-y.

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Abstract Japanese eels (Anguilla japonica) were trained on a Morris-type spatial learning task. There were four tubes in a pool, but the eels could hide in only one of these. The eels learned the position of the open tube, and maintained their performance when the pool was rotated to remove possible intra-maze cues. The eels could not maintain their performance in a dark room, suggesting that spatial learning involved extra-maze visual cues. When the position of the open tube was randomly changed every day, the performance of the eels in finding the open tube did not improve.

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Würtz, J., H. Taraschewski, and B. Pelster. "Changes in gas composition in the swimbladder of the European eel (Anguilla anguilla) infected with Anguillicola crassus (Nematoda)." Parasitology 112, no. 2 (1996): 233–38. http://dx.doi.org/10.1017/s003118200008481x.

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SummaryThe effect of Anguillicola crassus (Nematoda) on gas composition in the swimbladder of eels (Anguilla anguilla) was studied using mass spectrometry in feral eels from two German rivers and in experimentally infected eels. In both naturally and experimentally infected eels significant correlations were observed between the proportion of oxygen in the swimbladder and level of infection with Anguillicola crassus. In swimbladders of naturally infected feral eels the contribution of oxygen to swimbladder gas was reduced by 36–62·9% and in experimentally infected eels it was reduced by 11·4–5

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NORTON, J., D. ROLLINSON, and J. W. LEWIS. "Epidemiology ofAnguillicola crassusin the European eel (Anguilla anguilla) from two rivers in southern England." Parasitology 130, no. 6 (2005): 679–86. http://dx.doi.org/10.1017/s0031182004007139.

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European eelsAnguilla anguillafrom the rivers Thames and Test, in the south of England, were examined between 2000 and 2003 for infection with the swim-bladder nematodeAnguillicola crassus. Since its introduction to Thames eels at tidal estuarine locations circa 1987,A. crassushas become established in non-tidal freshwater stretches upriver and data from these locations are reported for the first time. The prevalence of infection at Thames estuary locations was higher during 2000–2003 than for the period 1987–1992. By 2003, similar prevalences were observed at freshwater and estuarine location

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Nzau Matondo, Billy, François Fontaine, Olivier Detrait, et al. "Glass Eel Restocking Experiments in Typologically Different Upland Rivers: How Much Have We Learned about the Importance of Recipient Habitats?" Water 15, no. 17 (2023): 3133. http://dx.doi.org/10.3390/w15173133.

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The efficiency of glass eel restocking as a conservation measure to restore the altered local eel stocks has never been evaluated by integrating the dimension of typological diversity of freshwater habitats in eel recruitment performance in terms of the abundance, density, growth, silvering, survival, catchability and eel yields. Here, we used the electrofishing method during a 6-year study to catch eels, and the most appropriate Jolly–Seber model was applied to estimate the demographic parameters in open populations. We found that most eels were yellow eels in the growth phase with a low abun

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Lennox, Robert J., Finn Økland, Hiromichi Mitamura, Steven J. Cooke, and Eva B. Thorstad. "European eel Anguilla anguilla compromise speed for safety in the early marine spawning migration." ICES Journal of Marine Science 75, no. 6 (2018): 1984–91. http://dx.doi.org/10.1093/icesjms/fsy104.

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Abstract There are substantial benefits to potential fitness conferred to animals that undertake migrations. However, animals must make compromises to maximize survival and compensate for the risks associated with long-distance movement. European eel (Anguilla anguilla), a migratory catadromous fish, has undergone population declines owing to changes in marine and freshwater habitat and interactions with human infrastructure, instigating research to investigate the mechanisms controlling their migration. Yellow-phase European eels from the local River Opo and silver-phase European eels transpl

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Jansen, Henrice M., Hendrik V. Winter, Maarten C. M. Bruijs, and Harry J. G. Polman. "Just go with the flow? Route selection and mortality during downstream migration of silver eels in relation to river discharge." ICES Journal of Marine Science 64, no. 7 (2007): 1437–43. http://dx.doi.org/10.1093/icesjms/fsm132.

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Abstract Jansen, H. M., Winter, H. V., Bruijs, M. C. M., and Polman, H. J. G. 2007. Just go with the flow? Route selection and mortality during downstream migration of silver eels in relation to river discharge. – ICES Journal of Marine Science, 64: 1437–1443. The European eel (Anguilla anguilla) has been in steep decline for several decades. Fisheries and hydropower-induced mortality presumably play an important role during the downstream migration of silver eels, and downstream-migrating silver eels must make various navigation and route-selection decisions to reach the sea. We examined the

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Castro, Fernando C., and Vinayak P. Dravid. "Characterization of Lithium Ion Battery Materials with Valence Electron Energy-Loss Spectroscopy." Microscopy and Microanalysis 24, no. 3 (2018): 214–20. http://dx.doi.org/10.1017/s1431927618000302.

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AbstractCutting-edge research on materials for lithium ion batteries regularly focuses on nanoscale and atomic-scale phenomena. Electron energy-loss spectroscopy (EELS) is one of the most powerful ways of characterizing composition and aspects of the electronic structure of battery materials, particularly lithium and the transition metal mixed oxides found in the electrodes. However, the characteristic EELS signal from battery materials is challenging to analyze when there is strong overlap of spectral features, poor signal-to-background ratios, or thicker and uneven sample areas. A potential

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Palstra, Arjan P., Ida van de Ven, Pauline Jéhannet, et al. "Human Chorionic Gonadotropin Enhancement of Early Maturation and Consequences for Reproductive Success of Feminized European Eel (Anguilla anguilla)." Fishes 8, no. 6 (2023): 281. http://dx.doi.org/10.3390/fishes8060281.

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To induce oocyte development, eels are weekly injected with salmon or carp pituitary extract (CPE). The weekly handling and hormone peaks result in inferior oocyte quality; therefore, alternative treatments that improve oocyte quality and reproductive success require investigation. The enhancement of early sexual maturation by a single injection with human chorionic gonadotropin (hCG), administered prior to CPE treatment, was investigated. Fifty feminized eels were subjected to simulated migration, after which eels received either a hCG or a sham injection. After two months, the hCG-treated ee

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MARCOGLIESE, D. J., and D. K. CONE. "Comparison of richness and diversity of macroparasite communities among eels from Nova Scotia, the United Kingdom and Australia." Parasitology 116, no. 1 (1998): 73–83. http://dx.doi.org/10.1017/s0031182097001923.

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Species richness and diversity of macroparasite assemblages were compared among American eels (Anguilla rostrata) from Nova Scotia, European eels (A. anguilla) from the United Kingdom (Kennedy, Bush & Aho, 1986; Esch et al. 1988; Kennedy, 1990, 1993), and Australian eels (A. reinhardtii) from Queensland (Kennedy, 1995). Community richness and diversity of the macroparasite fauna of American and European eels did not differ significantly for total parasite component communities, intestinal parasite component communities, and intestinal parasite infracommunities. The similarities in richness

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Gómez-Limia, Lucía, Roxana Cutillas, Javier Carballo, Inmaculada Franco, and Sidonia Martínez. "Free Amino Acids and Biogenic Amines in Canned European Eels: Influence of Processing Step, Filling Medium and Storage Time." Foods 9, no. 10 (2020): 1377. http://dx.doi.org/10.3390/foods9101377.

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This study evaluated the effects of the canning process and different filling media on the free amino acid and biogenic amine contents of eels. The main free amino acids were histidine, taurine and arginine, which constituted 72% of the free amino acids in raw eels. All steps in the canning process significantly altered the free amino acid content of eels, relative to raw samples. The changes were influenced by the step, the composition of the frying or filling medium and the storage time. The biogenic amine contents were very low in all samples. Histamine was not detected in either raw eels o

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Nzau Matondo, Billy, and Michaël Ovidio. "Decreased stock entering the Belgian Meuse is associated with the loss of colonisation behaviour in yellow-phase European eels." Aquatic Living Resources 31 (2018): 7. http://dx.doi.org/10.1051/alr/2017047.

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The upstream migratory behaviour of yellow-phase European eels was investigated in regulated inland rivers (>320 km upstream the sea), where the stock is in drastic decline. From 2010 to 2015, eels entering the Belgian Meuse River (n = 1357; total length, 231–755 mm) were caught in fish passes, tagged with a pit-tag and released. Their upstream movements were tracked during the next six consecutive years, using three detection stations installed in vertical-slot fish passes of the Meuse and its Ourthe tributary. Among the 1357 eels tagged, 27.6% (n = 374 individuals) were detected at one or

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Huisman, Jeroen B. J., Henry J. Kuipers, Leopold A. J. Nagelkerke, Peter Paul Schollema, and Inge van der Knaap. "Estuarine-Specific Migration of Glass Eels in the Ems Estuary." Fishes 8, no. 8 (2023): 392. http://dx.doi.org/10.3390/fishes8080392.

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Understanding recruitment of glass eels in estuaries is crucial for the conservation of the European eel (Anguilla anguilla). However, basic knowledge on estuarine-specific glass eel migration, including in estuarine harbours, is mostly lacking. Therefore, we studied glass eel migration in the Dutch–German Ems estuary and the harbour at Delfzijl (The Netherlands) and tagged glass eels with Visual Implant Elastomer tags (VIE tags). We released 2000 tagged glass eels into the Ems estuary itself and 1000 tagged glass eels into the tidal harbour at Delfzijl. At three estuarine locations, i.e., Del

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Rolvien, Tim, Florian Nagel, Petar Milovanovic, et al. "How the European eel ( Anguilla anguilla ) loses its skeletal framework across lifetime." Proceedings of the Royal Society B: Biological Sciences 283, no. 1841 (2016): 20161550. http://dx.doi.org/10.1098/rspb.2016.1550.

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European eels ( Anguilla anguilla ) undertake an impressive 5 000 km long migration from European fresh waters through the North Atlantic Ocean to the Sargasso Sea. Along with sexual maturation, the eel skeleton undergoes a remarkable morphological transformation during migration, where a hitherto completely obscure bone loss phenomenon occurs. To unravel mechanisms of the maturation-related decay of the skeleton, we performed a multiscale assessment of eels' bones at different life-cycle stages. Accordingly, the skeleton reflects extensive bone loss that is mediated via multinucleated bone-re

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Riyanto, Mochammad, Ai Siti Aminah, Wazir Mawardi, and Ronny Irawan Wahju. "Response of Anguilla bicolor Glass Eel to Different Light Colors." Omni-Akuatika 19, no. 1 (2023): 61. http://dx.doi.org/10.20884/1.oa.2023.19.1.993.

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The response of eel fish (Anguilla bicolor) glass eel stadia to different light is fundamental knowledge for developing fishing methods and conserving fish resources. The study aimed to describe how glass eel fish react to different types of light. In the laboratory, glass eels were observed responding to red, blue, and white LED light versus no light as controls. Glass eels ranging in size from 4.0 to 6.1 cm and weighing up to 0.28 g were caught in the Pelabuhanratu estuary of the Cimandiri River. Observations were made for 31 days, beginning five days after the glass eel was captured. The Ma

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Cresci, Alessandro, Caroline M. Durif, Claire B. Paris, et al. "The relationship between the moon cycle and the orientation of glass eels ( Anguilla anguilla ) at sea." Royal Society Open Science 6, no. 10 (2019): 190812. http://dx.doi.org/10.1098/rsos.190812.

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Links between the lunar cycle and the life cycle (migration patterns, locomotor activity, pulses in recruitment) of the European eel ( Anguilla anguilla ) are well documented. In this study, we hypothesized that the orientation of glass eels at sea is related to the lunar cycle. The European eel hatches in the Sargasso Sea and migrates across the Atlantic Ocean towards Europe. Upon reaching the continental shelf, the larvae metamorphose into glass eels and migrate up the estuaries, where some individuals colonize freshwater habitats. How glass eels navigate pelagic waters is still an open ques

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KELLY, C. E., C. R. KENNEDY, and J. A. BROWN. "Physiological status of wild European eels (Anguilla anguilla) infected with the parasitic nematode, Anguillicola crassus." Parasitology 120, no. 2 (2000): 195–202. http://dx.doi.org/10.1017/s0031182099005314.

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The effect of the parasitic swimbladder nematode, Anguillicola crassus, on the physiological status of wild European eels (Anguilla anguilla) was investigated during an 18 month survey (February 1995 until September 1996), and compared with that of wild uninfected eels collected over the same time-period. Despite the occurrence of up to 15 blood-feeding adults in the swimbladder lumen of the infected eels and as many as 25 additional larvae in the swimbladder wall, there were no major differences in hormonal, metabolic or osmoregulatory status of the 2 groups of eels. Wild European eels appear

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HANSSEN, R. G. J. M., N. MAYER-GOSTAN, G. FLIK, and S. E. WENDELAAR BONGA. "Influence of Ambient Calcium Levels on Tanniocalcin Secretion in the European EEL (Anguilla Anguilla)." Journal of Experimental Biology 162, no. 1 (1992): 197–208. http://dx.doi.org/10.1242/jeb.162.1.197.

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The cells of the corpuscles of Stannius appeared to be more active in eels acclimated to sea water than in eels acclimated to fresh water. In acclimated eels, however, total and ionic plasma calcium concentrations and stanniocalcin titers did not differ. This suggests that levels of stanniocalcin in freshwater-acclimated eels are sufficient to maintain normocalcemia in sea water. When freshwateracclimated eels were transferred directly to sea water, total and ionic calcium concentrations in the plasma increased significantly within 24 h but there was no apparent effect on the corpuscles of Sta

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Hewavitharane, C. A., T. D. Pickering, R. Ciro, and N. Mochioka. "Species composition, abundance and seasonal recruitment patterns of freshwater eels (Anguilla spp.) to Viti Levu, Fiji Islands, in the western South Pacific." Marine and Freshwater Research 69, no. 11 (2018): 1704. http://dx.doi.org/10.1071/mf18105.

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To understand the inshore recruitment mechanisms of tropical eels (Anguilla spp.), we collected 1368 glass eels at the mouth of a small river at Namelimeli, ~2km east of Navua Town, Fiji Islands, between April 2015 and June 2016. Specimens were identified using both morphological characters and DNA barcoding to only three species: one short-finned Anguilla obscura and two long-finned eels A. marmorata and A. megastoma. Anguilla obscura was the most abundant species (55% of glass eels collected) with peak recruitment periods from February to April. Anguilla marmorata was the second most abundan

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Hunt, J. A., and D. B. Williams. "EELS detection limits." Proceedings, annual meeting, Electron Microscopy Society of America 50, no. 2 (1992): 1468–69. http://dx.doi.org/10.1017/s0424820100131978.

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Why determine detection limits? A natural question to ask about any quantitative technique, including EELS in the STEM, is “How little of <x> can be observed?” Detection limits serve as a guide to what problems are solvable and what are the best techniques to analyze specific systems, e.g., EELS vs. EDXS vs. SIMS, etc. The exercise of determining EELS detection limits provides a sobering reminder of sizable uncertainties of numerous EELS variables, e.g., cross-sections, analyzed volumes, interaction delocalization, etc. Minimizing detection limits require optimization of many issues of t

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