Spring habitat use by stocked one year old European sturgeon Acipenser sturio in the freshwater-oligohaline area of the Gironde estuary

Acolas, Marie‐Laure; Pichon, Céline Le; Rochard, E.

doi:10.1016/j.ecss.2017.06.029

Cited by 15 publications

(7 citation statements)

References 63 publications

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“…One method to estimate space use from acoustic data is the use of Brownian Bridge models, which generate probability distributions for animal locations between successive detections based on conditional random walks between locations (Horne et al, 2007). This approach is increasingly being used to estimate patterns of space use from acoustic receiver arrays (Pagès et al, 2013;Becker et al, 2016;Acolas et al, 2017;Oh et al, 2017), though it is known to be sensitive to irregular detection records or large temporal gaps in detections (Horne et al, 2007;Pagès et al, 2013), which are common in acoustic tag data. One approach to mitigate these limitations is to use a combination of tagging technologies to evaluate the degree of protection conferred on mobile taxa by existing MPAs (Weng et al, 2005;Meyer et al, 2010;Carlisle et al, 2011;Papastamatiou et al, 2015;Drymon and Wells, 2017).…”

Section: Introductionmentioning

confidence: 99%

Estimating Space Use of Mobile Fishes in a Large Marine Protected Area With Methodological Considerations in Acoustic Array Design

et al. 2019

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Section: Introductionmentioning

confidence: 99%

Estimating Space Use of Mobile Fishes in a Large Marine Protected Area With Methodological Considerations in Acoustic Array Design

et al. 2019

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“…The concentration of two elements, As and Se, increases with fish length which might be correlated to the time spent in the environment. The highest values of Fe among fish released at or before 3 month-old might be linked to environmental exposure during their early life spent in the rivers compared to fish released at or above one year-old which reach, rapidly after their release, the saline estuary to grow (Acolas et al 2012(Acolas et al , 2017. However, we do not have any data about the Fe content in the water or sediments from the rivers concerned.…”

Section: Contaminants Measured In the Blood Of A Sturio From The Girmentioning

confidence: 79%

Health indicators and contaminant levels of a critically endangered species in the Gironde estuary, the European sturgeon

Acolas

Davail

Gonzalez

et al. 2019

Environ Sci Pollut Res

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The European sturgeon, Acipenser sturio, is a highly endangered species that almost disappeared in the last decades. Thanks to yearly restocking of the population, this species is still found in the Gironde estuary (France), where juveniles grow during several years before leaving to the ocean. The aim of this study was to evaluate the pressure exerted on these fish by known organic and inorganic contaminants during their stay at the Gironde estuary, and to get information on the fish's health in this context. Monthly captures over the year 2014, provided 87 fish from the cohorts 2012 and 2013 mainly, and from cohorts 2008, 2009 and 2011, all fish born in hatchery. We report the very first analyses of contaminant levels and of biological markers measured in the blood of these fish. Low inorganic contamination was found, composed of seven metals mainly: Zn (< 5 µg.mL-1), Fe (< 1.5 µg.mL-1), Cu (< 0.8 µg.mL-1), Se (< 0.8 µg.mL-1), As (< 0.25 µg.mL-1), Co (< 0.14 µg.mL-1) and Mn (< 0.03 µg.mL-1). Concerning persistent organic contaminants, the sum of 7 PCBs varied from 1 to 10 ng.g-1 plasma, that of 8 OCPs from 0.1 to 1 ng.g-1 , and that of 8 PBDEs from 10 to 100 pg.g-1. Higher levels of contaminants were measured during spring as compared to summer. The sex steroid hormone plasma levels (estradiol, testosterone and 11ketotestosterone) were quite low, which 2 was predictable for juveniles. The transcription of reproduction-involved genes (EstR, AR, LHR, sox9) in blood cells was demonstrated for the first time. Some of them were correlated to organic contaminant levels PCBs and OCPs. Other gene transcriptions (sodCu and bax) were correlated to PCBs and OCPs. However, the DNA damage level measured here as comet tail DNA and micronuclei ratio in red blood cells, were in the very low range of the values commonly obtained in fish from pristine areas. The data presented here can serve as a reference base for future monitoring of this population of sturgeons.

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“…However, considering the actual availability of YOY in the French captive stock it may not happen before 2021. When the assessment of experimental release of YOY in the Rhine will be possible, a comparison with the behaviour described in the Gironde (Acolas, Le Pichon, & Rochard, ) and the habitat assessment in the Elbe (Gessner, Zahn, Jaric, & Wolter, ) or a joined study would make sense to help find data gaps, differences in survival, growth parameters and spatial and temporal distribution.…”

Section: Discussionmentioning

confidence: 99%

Outmigration pathways of stocked juvenile European sturgeon (Acipenser sturioL., 1758) in the Lower Rhine River, as revealed by telemetry

Brevé

Vis²,

Houben

et al. 2018

J Appl Ichthyol

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Working towards a future Rhine Sturgeon Action Plan the outmigration pathways of stocked juvenile European sturgeon (Acipenser sturio L., 1758) were studied in the River Rhine in 2012 and 2015 using the NEDAP Trail system. A total of 87 sturgeon of 3 to 5 years old (n = 43 in 2012, n = 44 in 2015) were implanted with transponders and released in May and June in the river Rhine at the Dutch‐German border, approximately 160 km from the sea. In total three sturgeons (3%) were found dead on river banks within seven days after the release. Based upon their wounds these sturgeons were likely hit by ship‐propellers. Tracking results were obtained from 57 (66%) of the sturgeons, of which 39 (45%) indicated movement into the Port of Rotterdam. Here the sturgeons remained for an average of two weeks, which suggests they spent time to acclimatize to higher salinities before entering the North Sea. Of the 45 (52%) sturgeons that were confirmed to have entered the North Sea, ten (22%) were recaptured (mainly by shrimpers and gill‐nets) close to the Dutch coastline; nine were alive and were released. From the results we obtained the preferred outmigration pathways, movement speeds and an indication of impacting factors (i.e. ship propellers and bycatch). Bycatches provided also localisations information in the coastal area. A next step to complete this work would be to assess habitat selection in freshwater and downstream migration of young of the year (YOY sturgeons) in the Lower Rhine.

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Spring habitat use by stocked one year old European sturgeon Acipenser sturio in the freshwater-oligohaline area of the Gironde estuary

Cited by 15 publications

References 63 publications

Estimating Space Use of Mobile Fishes in a Large Marine Protected Area With Methodological Considerations in Acoustic Array Design

Estimating Space Use of Mobile Fishes in a Large Marine Protected Area With Methodological Considerations in Acoustic Array Design

Health indicators and contaminant levels of a critically endangered species in the Gironde estuary, the European sturgeon

Outmigration pathways of stocked juvenile European sturgeon (Acipenser sturioL., 1758) in the Lower Rhine River, as revealed by telemetry

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