Les sites de fraye de l'omble chevalier (Salvelinus alpinus L.) dans le Léman

Rubin, Jean‐François; Büttiker, B.

doi:10.1051/kmae:1992015

Cited by 9 publications

(6 citation statements)

References 14 publications

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“…For instance, up to four sympatric morphotypes are found in the single lake Thingvallavatn in Iceland (Sandlund et al, 1992). Quality and quantity of available spawning sites are limiting factors in this lake (Rubin, 1990). It spawns in deep areas (40-120 m) with low sedimentation, is highly sensitive to changes in oxygen levels and temperature, and is therefore potentially affected by eutrophication and global warming (Mari, Garaud, Evanno, & Lasne, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Stocking activities for the Arctic charr in Lake Geneva: Genetic effects in space and time

Savary

Dufresnes

Champigneulle

et al. 2017

Ecology and Evolution

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Artificial stocking practices are widely used by resource managers worldwide, in order to sustain fish populations exploited by both recreational and commercial activities, but their benefits are controversial. Former practices involved exotic strains, although current programs rather consider artificial breeding of local fishes (supportive breeding). Understanding the complex genetic effects of these management strategies is an important challenge with economic and conservation implications, especially in the context of population declines. In this study, we focus on the declining Arctic charr (Salvelinus alpinus) population from Lake Geneva (Switzerland and France), which has initially been restocked with allochtonous fishes in the early eighties, followed by supportive breeding. In this context, we conducted a genetic survey to document the evolution of the genetic diversity and structure throughout the last 50 years, before and after the initiation of hatchery supplementation, using contemporary and historical samples. We show that the introduction of exotic fishes was associated with a genetic bottleneck in the 1980–1990s, a break of Hardy–Weinberg Equilibrium (HWE), a reduction in genetic diversity, an increase in genetic structure among spawning sites, and a change in their genetic composition. Together with better environmental conditions, three decades of subsequent supportive breeding using local fishes allowed to re‐establish HWE and the initial levels of genetic variation. However, current spawning sites have not fully recovered their original genetic composition and were extensively homogenized across the lake. Our study demonstrates the drastic genetic consequences of different restocking tactics in a comprehensive spatiotemporal framework and suggests that genetic alteration by nonlocal stocking may be partly reversible through supportive breeding. We recommend that conservation‐based programs consider local diversity and implement adequate protocols to limit the genetic homogenization of this Arctic charr population.

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Section: Introductionmentioning

confidence: 99%

“…It spawns in deep areas (40-120 m) with low sedimentation, is highly sensitive to changes in oxygen levels and temperature, and is therefore potentially affected by eutrophication and global warming (Mari, Garaud, Evanno, & Lasne, 2016). Quality and quantity of available spawning sites are limiting factors in this lake (Rubin, 1990).…”

Section: Introductionmentioning

confidence: 99%

Stocking activities for the Arctic charr in Lake Geneva: Genetic effects in space and time

Savary

Dufresnes

Champigneulle

et al. 2017

Ecology and Evolution

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“…Des résultats similaires ont été observés, parfois sur de longues périodes, chez certains salmonidés ou d'autres poissons marqués à l'aide de micromarques, (JEFFERTS et al, 1963;BERGMAN et al, 1968;CHAMPIGNEULLE, 1987;HEIDINGER et COOK, 1988;RUBIN, 1990 ;BERGMAN et al, 1992). Par contre, SAUNDERS ET ALLEN (1967) ont détecté un léger ralentissement de la croissance chez des saumons atlantiques Salmo salar marqués par ablation de la nageoire adipeuse.…”

Section: Discussionunclassified

PREMIÈRE ÉVALUATION DES TECHNIQUES DE MARQUAGE D’ALEVINS D’OMBRE COMMUN (Thymallus thymallus L.) PAR CAUTÉRISATION DE LA NAGEOIRE ADIPEUSE OU PAR INJECTIONDE MICROMARQUES MAGNÉTIQUES

Mallet

Persat

Fiévet

2003

Bull. Fr. Pêche Piscic.

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RÉSUMÉIl est souvent nécessaire de marquer les poissons pour contrôler l'efficacité des opérations d'alevinage ou étudier la dynamique des populations en milieu naturel. L'article décrit des adaptations de deux techniques de marquage d'alevins d'Ombre commun (Thymallus thymallus L.) de 6-8 cm : (1) l'ablation par cautérisation de la nageoire adipeuse et (2) l'injection de micromarques magnétiques dans le cartilage nasal. Afin de mettre en évidence les effets à long terme de ces deux techniques de marquage, la survie et la croissance d'alevins marqués ont été comparées à celles d'alevins témoins non marqués élevés en bassins artificiels. Les taux observés de rétention ou de persistance des marques étaient très élevés (> 99 %). Les taux de survie et de croissance des alevins marqués, élevés séparément ou non, n'étaient pas significativement inférieurs à ceux des alevins témoins. Les deux méthodes sont donc bien adaptées au marquage de groupes de juvéniles d'Ombre commun.Mots-clés : micromarques magnétiques, cautérisation de la nageoire adipeuse, survie, croissance, ombre commun. FIRST EVALUATION OF TAGGING TECHNIQUES ON YOUNG EUROPEAN GRAYLING (Thymallus thymallus L.) BY CAUTERISATION OF THE ADIPOSE FIN OR BY INJECTION OF CODED WIRE TAGS ABSTRACTIt is often necessary to tag fish in order to control the efficiency of stocking or to investigate population dynamics in the wild. The paper deals with adaptations of two methods of tagging young European grayling (Thymallus thymallus L.) of 6-8 cm long: Bull. Fr. Pêche Piscic. (2003) (1) ablation by cauterisation of the adipose fin and (2) injection of coded wire tags into the nasal cartilage. In order to investigate the long-term effects of each tagging techniques, survival and growth of young tagged fish were compared to those of untagged fish. Rearing took place in artificial tanks and ponds. Observed rates of tag retention or tag persistence were very high (> 99%). Both survival and growth rates of tagged and untagged groups of fish, reared apart or not, did not differ significantly. Consequently, both methods appear to be suitable for tagging groups of young grayling.

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“…A good portion of LGW also moved from the large to the small lake during the three years. In Lake Geneva, only a very small number of tagged fish were able to travel from one end to the other end, about 44 km in length (Rubin, 1990), but Lake Annecy is only one-third of this length. The present study has been helpful for understanding some questions regarding the growth and management of Arctic char in Lake Annecy.…”

Section: Dispersal Of Fishmentioning

confidence: 99%

Comparative effectiveness, growth and dispersal of stocked Arctic char (Salvelinus alpinus) from different origins in Lake Annecy

Janjua¹,

Zanella²,

Gerdeau×³

2010

Knowl. Managt. Aquatic Ecosyst.

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Les sites de fraye de l'omble chevalier (Salvelinus alpinus L.) dans le Léman

Cited by 9 publications

References 14 publications

Stocking activities for the Arctic charr in Lake Geneva: Genetic effects in space and time

Stocking activities for the Arctic charr in Lake Geneva: Genetic effects in space and time

PREMIÈRE ÉVALUATION DES TECHNIQUES DE MARQUAGE D’ALEVINS D’OMBRE COMMUN (Thymallus thymallus L.) PAR CAUTÉRISATION DE LA NAGEOIRE ADIPEUSE OU PAR INJECTIONDE MICROMARQUES MAGNÉTIQUES

Comparative effectiveness, growth and dispersal of stocked Arctic char (Salvelinus alpinus) from different origins in Lake Annecy

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