Forty Years of Decline and 10 Years of Management Plan: Are European Eels (Anguilla Anguilla) Recovering?

2020 ◽  
pp. 269-295
Author(s):  
Eric Feunteun ◽  
Patrick Prouzet
Keyword(s):  
Anguilla Anguilla ◽  
Management Plan

scholarly journals Pre-release processes influencing short-term mortality of glass eels in the French eel (Anguilla anguilla, Linnaeus 1758) stocking programme

2015 ◽  
Vol 73 (1) ◽  
pp. 150-157 ◽  
Author(s):  
Q. Josset ◽  
T. Trancart ◽  
V. Mazel ◽  
F. Charrier ◽  
L. Frotté ◽  
...  
Keyword(s):  
Body Condition ◽  
Anguilla Anguilla ◽  
Management Plan ◽  
The Body ◽  
European Eel ◽  
The European Union ◽  
Short Term ◽  
Good Body Condition ◽  
Short Term Mortality ◽  
Glass Eels

Abstract The decline in the European eel has led the European Union to require that its Member States establish an Eel Management Plan, which includes a set of measures to help preserve and restore the wild eel populations. Stocking has been conducted in France since 2011 as part of this Management Plan. This stocking programme is based on a protocol designed by the French National Museum of Natural History and includes an assessment of the short-term (15 d after release) mortality and three recapture surveys at 6, 12, and 36 months after release. The present study aims to assess the different processes influencing the short-term mortality to provide recommendations to reduce mortality and increase the efficiency of the releases. A linear model was built to examine the different variables selected modelling. The resulting model explained 56.4% of the total deviance; the main factor in terms of explained deviance was the operation (31.2%), which actually includes a number of handling parameters. The other factors influencing the short-term mortality were the release year, the fishmonger that provided the glass eels, the duration of stalling (period of captivity) before release, the body condition, the marking, and the type of mortality test. It appears that some of these variables could be adjusted to reduce the short-term mortality. For instance, selecting the most suitable release sites to stock or selecting glass eels with good body condition, adjusting the duration of stalling, or limiting the marking should help reduce short-term mortality.

scholarly journals Monitoring of herpesvirus anguillae (AngHV-1) infections in the European eel in north-west Poland

2016 ◽  
Vol 72 (9) ◽  
pp. 564-566 ◽  
Author(s):  
Nguyen Thuc Tuan ◽  
Jolanta Kempter ◽  
Remigiusz Panicz
Keyword(s):  
Natural Waters ◽  
Anguilla Anguilla ◽  
Management Plan ◽  
European Eel ◽  
Stock Management ◽  
Fish Farms ◽  
Important Species ◽  
North West ◽  
Pcr Product ◽  
Pathogenic Viruses

The European eel (Anguilla anguilla) is an economically important species in Poland, not only due to the quality and price of its meat, but also due to the eel stock management plan implemented since 2010. However, the imported juvenile eels for reintroduction are directly introduced into waters or reared in fish farms without necessary monitoring of the health status, especially for hazardous and pathogenic viruses. The study was conducted in the second half of 2014 using the European eels collected from Poland (Dąbie Lake, Szczecin Lagoon, hatcheries) and Denmark, mainly from importers and organizations producing material for reintroduction. A total of 256 samples were analysed including gills, liver, kidney, spleen, intestine and heart. Detection of the AngHV-1 was performed using pair primers designed to amplify the gene fragment encoding the viral DNA polymerase. Each PCR product was confirmed by bidirectional sequencing and sequence alignment with GenBank sequences. Obtained results indicate that the infection status of the eels imported to Poland is in the range of 0 to 100%, with the highest percentage of asymptomatic carriers among the fish imported from Denmark for the purpose of reintroduction and rearing. The eels collected in natural waters demonstrated an AngHV-1 infection rate of 30% (Dąbie Lake) and 40% (Trzebież). Bioinformatics analysis demonstrated that all these sequences were identical and represented the haplotype characterized for the first time in Poland by Kempter et al. (2014). The intensity of eel reintroduction in Poland is 1.2 million individuals per year, which permits a conclusion that the species is important for the fishing economy and should be monitored against AngHV-1. The demonstrated existing high risk posed by mass kills of the European eel in domestic waters after the introduction of the herpesvirus AngHV-1 from imported fish.

Chemically Contaminated Eel Fed to Pregnant and Lactating Mouse Dams Causes Hyperactivity in Their Offspring

2016 ◽  
Vol 86 (1-2) ◽  
pp. 36-47 ◽  
Author(s):  
Imen Dridi ◽  
Nidhal Soualeh ◽  
Torsten Bohn ◽  
Rachid Soulimani ◽  
Jaouad Bouayed
Keyword(s):  
Open Field ◽  
Early Life ◽  
Home Cage ◽  
Anguilla Anguilla ◽  
Acetylcholinesterase Activity ◽  
Female Offspring ◽  
Significant Inhibition ◽  
Standard Diet ◽  
Early Life Exposure ◽  
Cage Test

Abstract.This study examined whether perinatal exposure to polluted eels (Anguilla anguilla L.) induces changes in the locomotor activity of offspring mice across lifespan (post-natal days (PNDs) 47 – 329), using the open field and the home cage activity tests. Dams were exposed during gestation and lactation, through diets enriched in eels naturally contaminated with pollutants including PCBs. Analysis of the eel muscle focused on the six non-dioxin-like (NDL) indicator PCBs (Σ6 NDL-PCBs: 28, 52, 101, 138, 153 and 180). Four groups of dams (n = 10 per group) received either a standard diet without eels or eels (0.8 mg/kg/day) containing 85, 216, or 400 ng/kg/day of ϵ6 NDL-PCBs. The open field test showed that early-life exposure to polluted eels increased locomotion in female offspring of exposed dams but not in males, compared to controls. This hyperlocomotion appeared later in life, at PNDs 195 and 329 (up to 32 % increase, p < 0.05). In addition, overactivity was observed in the home cage test at PND 305: exposed offspring females showed a faster overall locomotion speed (3.6 – 4.2 cm/s) than controls (2.9 cm/s, p <0.05); again, males remained unaffected. Covered distances in the home cage test were only elevated significantly in offspring females exposed to highest PCB concentrations (3411 ± 590 cm vs. 1377 ± 114 cm, p < 0.001). These results suggest that early-life exposure to polluted eels containing dietary contaminants including PCBs caused late, persistent and gender-dependent neurobehavioral hyperactive effects in offspring mice. Furthermore, female hyperactivity was associated with a significant inhibition of acetylcholinesterase activity in the hippocampus and the prefrontal cortex.

Participatory Mapping in Browns Canyon National Monument, Colorado (USA)

2017 ◽  
Vol 1 (1) ◽  
pp. 1-16
Author(s):  
John Harner ◽  
Lee Cerveny ◽  
Rebecca Gronewold
Keyword(s):  
Land Management ◽  
Planning Process ◽  
Management Plan ◽  
Bureau Of Land Management ◽  
National Monument ◽  
Resource Managers ◽  
Different Types ◽  
Us Forest Service ◽  
Natural Resource Managers

Natural resource managers need up-to-date information about how people interact with public lands and the meanings these places hold for use in planning and decision-making. This case study explains the use of public participatory Geographic Information System (GIS) to generate and analyze spatial patterns of the uses and values people hold for the Browns Canyon National Monument in Colorado. Participants drew on maps and answered questions at both live community meetings and online sessions to develop a series of maps showing detailed responses to different types of resource uses and landscape values. Results can be disaggregated by interaction types, different meaningful values, respondent characteristics, seasonality, or frequency of visit. The study was a test for the Bureau of Land Management and US Forest Service, who jointly manage the monument as they prepare their land management plan. If the information generated is as helpful throughout the entire planning process as initial responses seem, this protocol could become a component of the Bureau’s planning tool kit.

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