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  • 1
    Online Resource
    Online Resource
    The influence of diet on fatty acid and stable isotope composition in European eel (Anguilla anguilla) (2008)
    Kiel
    Details Availability
    Keywords: Hochschulschrift
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (86 Seiten = 6 MB) , Illustrationen, Graphen, Karte
    Edition: 2021
    URL: https://oceanrep.geomar.de/2092/
    Language: English
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  • 2
    Online Resource
    Online Resource
    Factors challenging the European eel (Anguilla anguilla) stock recovery in continental waters (2013)
    Details Availability
    Keywords: Hochschulschrift
    Type of Medium: Online Resource
    Pages: Online-Ressource
    URL: http://nbn-resolving.de/urn:nbn:de:gbv:8-diss-111633
    URL: http://d-nb.info/1031667016/34
    URL: http://macau.uni-kiel.de/receive/dissertation_diss_00011163
    URN: urn:nbn:de:gbv:8-diss-111633
    DDC: 590
    Language: English
    Note: Kiel, Univ., Diss., 2013
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  • 3
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    Model prediction vs. reality--testing the predictions of a European eel (Anguilla anguilla) stock dynamics model against the in situ observation of silver eel escapement in compliance with the European eel regulation (2013)
    Oxford Univ. Press
    In:  ICES Journal of Marine Science, 70 (2). pp. 309-318.
    Details
    Publication Date: 2019-09-23
    Description: A direct monitoring of European silver eel (Anguilla anguilla, L) escapement from rivers and estuaries has been proven to be challenging, and a Europe-wide documentation of escaping silver eel numbers therefore hardly seems realistic. To reinforce management decisions, policy-makers are thus widely reliant on the accuracy of escapement models. A 3-year programme of silver eel escapement monitoring was undertaken to compile model input data and revise an eel population model (German Eel Model II; GEM II) already used in the decision-making process of management authorities. By compiling necessary input data and analysing vital system-specific population characteristics, it was possible to compare the documented silver eel escapement with the modelled potential silver eel escapement. Resulting model predictions were close to actually monitored escapement numbers, which were distinctly lower than reference escapement values for the same freshwater system given in the implementation report of the German Eel Management Plans. Applying different commercial and recreational catch scenarios revealed the sensitivity of the model. The results show the potential of the GEM II and highlight the importance of high-quality input data to use model predictions as the basis for management measures.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1093/icesjms/fss188
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    Escapement success of silver eels from a German river system is low compared to management-based estimates (2014)
    Wiley
    In:  Freshwater Biology, 59 (1). pp. 64-72.
    Details
    Publication Date: 2019-09-23
    Description: The European eel (Anguilla anguilla) stock experienced a sharp decline during the last decades and is suffering from massive anthropogenic impacts on inland waters. To evaluate the benefit of management measures and to better understand the contribution of single drainage systems to spawner production, knowledge of the respective silver eel escapement is required. Furthermore, a better understanding of environmental conditions that potentially trigger the onset of spawning migration is needed to reduce anthropogenic mortalities during riverine eel migration. Investigations are also necessary to clarify whether fish protecting devices and bypasses at barriers are functional and truly increase eel survival and escapement rates. In this study, total female silver eel escapement from a northern German drainage system (Schwentine River) was assessed over a period of three consecutive years, and downstream migration patterns were compared to potential environmental triggers. Furthermore, the benefit of two fish bypasses (surface and deep) and a trash rack at the hydropower station for the survival of migrating eels was examined, and the spawner quality of escaping silver eels was determined by analysing lipid content and infection intensities with the swimbladder parasite Anguillicoloides crassus. The results indicate that silver eel escapement from the Schwentine drainage system is far below the estimated values underlying the respective eel management plan, highlighting the necessity of direct migration assessments to validate indirect estimations that include multiple assumptions and uncertainties. Major downstream migration events took place during short time periods in autumn and appear to be influenced by river discharge and water temperatures, suggesting that a precise prediction of escapement events is possible. Regarding spawner quality, fat reserves appear sufficient for escaping silver eels to migrate and spawn. However, high A. crassus prevalence and infection intensities are assumed to further reduce the number of potential spawners. Another matter of concern is the high trash rack mortality at the hydropower station that illustrates the need of fish protecting devices that fulfil eel-specific requirements.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1111/fwb.12246
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    Recruitment collapse and population structure of the European eel shaped by local ocean current dynamics (2014)
    Elsevier
    In:  Current Biology, 24 (1). pp. 104-108.
    Details
    Publication Date: 2021-05-07
    Description: Highlights: • We combine high-resolution ocean models with population genetics • Variation in wind-driven ocean currents mediates the collapse of A. anguilla • Female eels are philopatric within the Sargasso Sea, while males maintain gene flow • We present first evidence of the role of ocean currents in shaping species’ evolution Summary: Worldwide, exploited marine fish stocks are under threat of collapse [1]. Although the drivers behind such collapses are diverse, it is becoming evident that failure to consider evolutionary processes in fisheries management can have drastic consequences on a species’ long-term viability [2]. The European eel (Anguilla anguilla; Linnaeus, 1758) is no exception: not only does the steep decline in recruitment observed in the 1980s [ 3 and 4] remain largely unexplained, the punctual detection of genetic structure also raises questions regarding the existence of a single panmictic population [ 5, 6 and 7]. With its extended Transatlantic dispersal, pinpointing the role of ocean dynamics is crucial to understand both the population structure and the widespread decline of this species. Hence, we combined dispersal simulations using a half century of high-resolution ocean model data with population genetics tools. We show that regional atmospherically driven ocean current variations in the Sargasso Sea were the major driver of the onset of the sharp decline in eel recruitment in the beginning of the 1980s. The simulations combined with genotyping of natural coastal eel populations furthermore suggest that unexpected evidence of coastal genetic differentiation is consistent with cryptic female philopatric behavior within the Sargasso Sea. Such results demonstrate the key constraint of the variable oceanic environment on the European eel population.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.cub.2013.11.031
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 6
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    Anthropogenic hybridization between endangered migratory and commercially harvested stationary whitefish taxa (Coregonus spp.) (2014)
    Wiley
    In:  Evolutionary Applications, 7 (9). pp. 1068-1083.
    Details
    Publication Date: 2020-10-26
    Description: Natural hybridization plays a key role in the process of speciation. However, anthropogenic (human induced) hybridization of historically isolated taxa raises conservation issues. Due to weak barriers to gene flow and the presence of endangered taxa, the whitefish species complex is an excellent study system to investigate the consequences of hybridization in conservation. We focused on three naturally reproductively isolated whitefish taxa in Germany: the endangered, anadromous North Sea houting (NSH) and Baltic houting (BH), which were reintroduced after local extinction, and the commercially stocked European whitefish (EW). To evaluate the genetic integrity of each taxon, source and reintroduced populations of NSH and BH, and EW populations were characterized based on two mitochondrial and 17 microsatellite loci. Additionally, we investigated gill raker counts as an adaptive phenotypic trait. Even though clear genetic and phenotypic differentiation confirmed the houtings as separate evolutionarily significant units, admixture analyses revealed an extensive hybrid zone. Hybridizations were introgressive, positively correlated with genetic diversity, and were reflected in the gill raker counts. The BH distribution range showed higher heterogeneity and stronger admixture than the NSH range. Erroneous stocking with non-native genotypes best explained these patterns, which pose challenges for the conservation of the endangered NSH and BH.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1111/eva.12166
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 7
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    Lost in Migration - Preliminary results of tracking migration routes of European eel (Anguilla Anguilla) in the Baltic Sea (2010)
    In:  [Poster] In: ISOS PhD Student Conference 2010, 04.-06.10.2010, Hamburg, Germany .
    Details
    Publication Date: 2012-02-23
    Type: Conference or Workshop Item , NonPeerReviewed
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    OceanRep: Poster
  • 8
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    Tracking the migratory success of stocked European eelsAnguilla anguillain the Baltic Sea (2013)
    Wiley | Blackwell
    In:  Journal of Fish Biology, 82 (2). pp. 686-699.
    Details
    Publication Date: 2019-08-08
    Description: To investigate the extent to which European silver eels Anguilla anguilla, originating from stocking programmes in the Baltic Sea tributaries, effectively contribute to the spawning stock, two hundred and seventy-four formerly stocked A. anguilla. emigrating from the Schwentine River near Kiel, Germany, were tagged with T-Bar anchor tags. A total of 29 Anguilla spp. were recaptured (c. 11%) up to 14 months after release. Stocking history of recaptured A. anguilla. was confirmed by otolith microchemistry. Recapture locations were concentrated around the outlet of the Baltic Sea (Danish Belt Sea) with 62% of all recaptures reported here or in the Kattegat. Recaptured Anguilla spp. showed a reduction in both LT and mass (mean ± s.d. = −1·5 ± 0·9 cm and −125·3 ± 50·1 g) while average total fat content remained in the order of values previously reported as high enough to provide energy resources to allow successful completion of the spawning migration (mean ± s.d. = 28·4 ± 4·4%). The documented mean rate of travel (0·8 km day−1), however, indicated a delay in the target-oriented migration that might be interpreted as a delayed initial migration phase of orientation towards the exit of the Baltic Sea.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1111/jfb.12032
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 9
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    Introduced American eelsAnguilla rostratain European waters: life-history traits in a non-native environment (2014)
    Wiley-Blackwell
    In:  Journal of Fish Biology, 84 (6). pp. 1740-1747.
    Details
    Publication Date: 2017-09-14
    Description: This study investigated growth, condition and development of American eels Anguilla rostrata that were introduced into a European river to estimate their competitive potential in a non-native habitat. Results demonstrate that A. rostrata develops normally in European waters and successfully competes with the native European eel Anguilla anguilla. In addition, A. rostrata appears to be more susceptible to the Asian swimbladder nematode Anguillicola crassus than A. anguilla and could support the further propagation of this parasite. Detected differences in fat content and gonad mass between Anguilla species are assumed to reflect species-specific adaptations to spawning migration distances. This study indicates that A. rostrata is a potential competitor for the native fauna in European fresh waters and suggests strict import regulations to prevent additional pressure on A. anguilla and a potential further deterioration of its stock situation.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1111/jfb.12394
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 10
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    Factors challenging the European eel (Anguilla anguilla) Stock recovery in continental waters (2012)
    In:  (PhD/ Doctoral thesis), Christian-Albrechts-Universität Kiel, Kiel, Germany, 101 pp
    Details
    Publication Date: 2013-01-10
    Type: Thesis , NonPeerReviewed
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    OceanRep: Thesis - not published by a publisher
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