Suivi des pêches de géniteurs d'omble chevalier (Salvelinus alpinus L.) sur la partie française du lac Léman de 1982 à 1987. Premières données sur le pacage lacustre de l'omble

Champigneulle, Alexis; Michoud, Maryse; Gerdeau×, Daniel; Gillet, C.; Guillard, Joanny; Rojas-Beltan, R.

doi:10.1051/kmae:1988008

Cited by 8 publications

(4 citation statements)

References 4 publications

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“…This trend promotes undesirable (large filamentous) species, which raises problems for fish exploitation (due to the deposition of huge filaments mats on the nets). In addition to factors like global warming and meteorological conditions, this trend could also be reinforced by the important change observed at the top of the food web, which follows a succession quite coherent with both the effort made toward a better annual recruitment of the exploited fish and with the expected decrease of the trophic status of the lake (Champigneulle et al 1993; Gerdeaux 1998). This evolution is characterized by a rapid increase of whitefish and a strong regression of roach, which very densely colonized the entire lake in the 1970s.…”

Section: Discussionmentioning

confidence: 99%

“…As a result, annual means of total phosphorus concentration measured in the lake increased from 10 μg/L in 1960 to approximately 90 μg/L in 1979, and Lake Geneva, considered to be oligotrophic until approximatley 1960, became eutrophic in the early 1970s (Anneville & Pelletier 1999). The most striking consequences reported were the decrease in mean annual water transparency, a more frequent occurrence of summer (July–August) phytoplankton blooms (Anneville et al 2001) and a drastic decrease in the recruitment of exploited fish, especially whitefish ( Coregonus lavaretus ) and artic char ( Salvelinus alpinus ) (Champigneulle et al 1993; Gerdeaux 1998). Measures were taken to reduce P inputs into the lake in order to avoid further deterioration in water quality and biogenic capacity.…”

Section: Introductionmentioning

confidence: 99%

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Restoration of Lake Geneva: Expected versus observed responses of phytoplankton to decreases in phosphorus

Anneville

Ginot

Angéli³

2002

Lakes & Reservoirs

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Long‐term phytoplankton responses in Lake Geneva to a decline in phosphorus (P) loading are examined in terms of summer (July–September) biomass and community structure. With the rapid development of human activity on its banks and within its catchment area in the 1960s, this large subalpine hydrosystem shifted from oligotrophy to eutrophy within approximately one decade. Measures to reduce P loading were initiated successfully in the mid‐1970s, when total P concentrations in the winter overturn altered from 90 μg/L in 1980 to 40 μg/L in 1998. Until the 1990s, algal descriptors improved as expected (biomass decline, reappearance of diatom species, increased contribution of nanoplankton). Then, paradoxically, and in contrast to the reappearance of oligotrophic species, summer algal biomass began to increase. Pre‐summer (period prior to the beginning of the clear water phase) dissolved inorganic phosphorus concentrations and summer phytoplankton composition presented similar interannual trends. However, the succession of phytoplankton structure during the reoligotrophication phase differed greatly from that during the eutrophication period, and a recent abnormal upward trend in algal densities is mainly the result of the development of large species that formerly were only common from late September until November. This community change, mainly triggered by filamentous (Mougeotia gracillima, Tribonema) or motile forms (Dinobryon sociale, Cryptophycea), seems to have been induced by the earlier and greater deepening of the P‐depleted layer. In addition to milder summers, this massive development of larger forms seems to be favoured by four of their biological features: tolerance to warm temperatures, tolerance to low‐light intensity (might exploit deeper layers where P is not yet limiting), shapes not only providing a large surface to volume ratio or motility (adaptation to low‐nutrient concentrations), but increasing resistance to zooplankton grazing. This paradoxical trend, perhaps reinforced by the decline on roach Rutilus rutilus abundance (an opportunistic planktivore), is likely to remain until the P‐depleted zone is extended below the layers that can be frequently resupplied in nutrients by hydrodynamic processes.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Restoration of Lake Geneva: Expected versus observed responses of phytoplankton to decreases in phosphorus

Anneville

Ginot

Angéli³

2002

Lakes & Reservoirs

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“…In deep lakes, surveying of the intensity and duration of spawning activity can be carried out by capture of ripe spawners in the spawning areas (Frost, 1965 ;Champigneulle et al, 1988) or by observation of the spawning grounds by divers (Rubin & BUttiker, 1993) but the eggs of many fish species are laid on large surface areas ; egg density is consequently low (Souchon, 1984) and the sampling of the eggs is difficult and uncertain . It is also possible to attract the spawners to artificial substrates (Jones, 1982) .…”

Section: Introductionmentioning

confidence: 99%

A survey of the spawning of perch (Perca fluviatilis), pike (Esox lucius), and roach (Rutilus rutilus), using artificial spawning substrates in lakes

Gillet

Dubois

1995

Hydrobiologia

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The development of spawning in perch, pike and roach in Lake Geneva has been studied by means of artificial spawning substrates, laid at different depths, from 1984 to 1993 . In Lake Geneva, perch spawned in May . A rise of surface water temperature up to 14 °C stimulated spawning activity while bad weather (surface temperature at 10 °C) induced a spread of the spawning period over more than one month . The spawning period was delayed in years when the mean width of perch egg-ribbons was the largest ; this corresponded to the biggest females . At the beginning of the spawning period (early in May), perch preferentially chose a depth of 4 m to spawn . In contrast, at the end of the spawning period, maximum spawning intensity was observed at a depth of 12 m . This phenomenon was more pronounced when water temperature rose above 14 °C in the top 4 m while it remained below 12 °C at a depth of 12 m . Pike spawned at the end of April and at the beginning of May in Lake Geneva . They preferred spruce branches among the different spawning substrates that we tested in Lake Vouglans . When the water temperature increased at the surface of Lake Geneva, pike preferred to lay their eggs on substrates set at 3 m depth where the temperature was cooler than in the surface layer (10 .5 °C vs 14 °C) . Roach spawned during the last two weeks of May or during the first two weeks of June in Lake Geneva, depending on water temperature . Spawning had generally been spread over a week, but a sudden decrease of water temperature could slow spawning intensity . Roach were able to lay their eggs on natural or synthetic substrates, located 0 .5 m below the surface near the shore as well as, at a distance of several hundred metres from the shore . The survival of eggs was always above 90% for perch and roach and generally above 70% for pike . 409

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“…74 % de l'ensemble des poissons marqués en Suisse en 1984, puis recapturés ultérieurement, ont été péchés dans les eaux suisses. En admettant que le comportement des ombles immergés en France soit identique(CHAMPIGNEULLE et al, 1988), 26 % de ceux-ci ont donc migré…”

unclassified

Quelle est la proportion d'ombles chevaliers (Salvelinus alpinus L.) issus de reproduction naturelle ou de repeuplement, dans le Léman

Rubin¹,

Büttiker

1993

Bull. Fr. Pêche Piscic.

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RÉSUMÉLa proportion d'ombles chevaliers, Salvelinus alpinus (L.), issus de fraye naturelle, des cohortes 1984 et 1985, a été estimée en marquant une partie des estivaux issus de pisciculture immergés dans le Léman. En 1984, entre 8.3 et 24.8 % seulement des estivaux présents dans les eaux suisses, au moment de la mise à l'eau des individus marqués, étaient issus de fraye naturelle. Ce chiffre est compris entre 19.1 et 34.9% pour la cohorte 1985. Le repeuplement apparaît donc comme très efficace. Une étude des principaux sites de fraye de l'omble, de même qu'une analyse des statistiques de pêche, démontre également cette efficacité. WHAT IS THE PROPORTION OF ARCTIC CHAR, SALVELINUS ALPINUS (L), COMING FROM NATURAL SPAWNING OR FROM STOCKING IN LAKE GENEVA ? SUMMARYThe proportion of Arctic char, Salvelinus alpinus (L.), coming from natural spawning or from stocking has been estimated for the 1984 and 1985 cohorts by marking the fingerlings reared in hatchery and released in Lake Geneva. In 1984, the proportion of the fingerlings coming from natural spawning present in the Swiss waters of the Lake when the marked fish were released, is situated between 8.3 and 24.8 %. Between 19.1 and 34.9 % for 1985. Thus stocking of fingerlings appears very efficient. A study of the main spawning grounds of the char in Lake Geneva and an analysis of the fishing statistics also show this efficiency.

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Suivi des pêches de géniteurs d'omble chevalier (Salvelinus alpinus L.) sur la partie française du lac Léman de 1982 à 1987. Premières données sur le pacage lacustre de l'omble

Cited by 8 publications

References 4 publications

Restoration of Lake Geneva: Expected versus observed responses of phytoplankton to decreases in phosphorus

Restoration of Lake Geneva: Expected versus observed responses of phytoplankton to decreases in phosphorus

A survey of the spawning of perch (Perca fluviatilis), pike (Esox lucius), and roach (Rutilus rutilus), using artificial spawning substrates in lakes

Quelle est la proportion d'ombles chevaliers (Salvelinus alpinus L.) issus de reproduction naturelle ou de repeuplement, dans le Léman

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