Updating water quality targets for shallow Lake Balaton (Hungary), recovering from eutrophication

Istvánovics, Vera; Clement, Adrienne; Somlyódy, L.; Specziár, András; Tóth, László; Padisák, Judit

doi:10.1007/978-1-4020-6158-5_31

Cited by 46 publications

(75 citation statements)

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“…2). This finding is in accordance with the recent oligotrophication trends of Lake Balaton and the depressed abundance of cyanobacteria which exhibited their last bloom in 1994 (Istvánovics et al, 2007). Nevertheless, algal blooms caused mainly by Microcystis seem to play important role in the invasion potential of bigheaded carps, as it was proved by Anderson et al (2015) in the case of Lake Erie.…”

Section: Discussionsupporting

confidence: 87%

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Gut content microbiota of introduced bigheaded carps ( Hypophthalmichthys spp.) inhabiting the largest shallow lake in Central Europe

Borsodi

Krett

Felföldi

et al. 2017

Microbiological Research

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Studying the microbiota in the alimentary tract of bigheaded carps (Hypophthalmichthys spp.) gained special interest recently, as these types of investigations on non-native fish species may lead to a better understanding of their ecological role and feeding habits in an invaded habitat. For microbiological examinations, bigheaded carp gut contents and water column samples from Lake Balaton (Hungary) were collected from spring to autumn in 2013.Denaturing Gradient Gel Electrophoresis (DGGE) and pyrosequencing of the 16S rRNA gene were performed to reveal the composition. According to the DGGE patterns, bacterial communities of water samples separated clearly from that of the intestines. Moreover, the bacterial communities in the foreguts and hindguts were also strikingly dissimilar. Based on pyrosequencing, both foregut and hindgut samples were predominated by the fermentative genus Cetobacterium (Fusobacteria). The presence of some phytoplankton taxa and the high relative abundance of cellulose-degrading bacteria in the guts suggest that intestinal microbes may have an important role in digesting algae and making them utilizable for bigheaded carps that lack cellulase enzyme. In turn, the complete absence of typical heterotrophic freshwater bacteria in all studied sections of the intestines indicated that bacterioplankton probably has a negligible role in the nutrition of bigheaded carps.

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Section: Discussionsupporting

confidence: 87%

“…However, the question what factors facilitate bigheaded carps in attaining high growth rate under low planktonic productivity (Istvánovics et al, 2007) and high competition for zooplanktonic food resources by other fish species (Specziár & Rezsu, 2009) …”

Section: Discussionmentioning

confidence: 99%

Gut content microbiota of introduced bigheaded carps ( Hypophthalmichthys spp.) inhabiting the largest shallow lake in Central Europe

Borsodi

Krett

Felföldi

et al. 2017

Microbiological Research

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“…Fielder, 1992;Johnson et al, 1996;Kristiansen et al, 2000;Michaletz et al, 2008;Specziár, 2010; but see Specziár and Turcsányi, 2014). Moreover, recapture rate also varied between lake areas following the increasing trophic gradient from the Siófok towards the Keszthely basin (Istvánovics et al, 2007). This phenomenon may be as good related to better survival of stocked pikeperch in more food rich environment which is also supported by the same main trend of fish biomass in Lake Balaton (Bíró, 1997;Specziár, 2010).…”

Section: Discussionmentioning

confidence: 88%

“…The lake is oligo-mesotrophic with mean annual chlorophyll-a concentrations of 3.6-18.7 mg m À3 (Istvánovics et al, 2007). At present, only 47% of the lake shore is in a natural or seminatural state and these sections are covered by reed grass Phragmites australis.…”

Section: Study Areamentioning

confidence: 99%

Management of pikeperch stocking in Lake Balaton: effect of season, area, fish size and method of release on the rate and distribution of recaptures

Specziár

Turcsányi

2017

Knowl. Manag. Aquat. Ecosyst.

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-Pikeperch Sander lucioperca is an economically important fish which depleted populations need intensive management and supplemental stocking. We aimed to assess the relative influence of various pikeperch stocking strategies in Lake Balaton, Hungary, and tested 60 stocking set-ups (two seasons Â three lake areas Â shore vs. offshore release Â five size groups) by releasing 3000 tagged yearlings. Anglers reported data of 522 recaptures within four years after stocking. Recapture rate was highest in stocking of the most productive lake area, increased with fish size, was higher in shore than offshore releases, but did not differed between stocking seasons. Fish stocked to oligotrophic areas travelled longer distances and dispersed more than those stocked to the mesotrophic area. Fish size had little effect, whereas season and method of stocking had no effect on dispersal of fish. To conclude, in pikeperch, autumn stocking with large yearlings released directly from the shore is recommended over other set-ups. Stocking quotas may be concentrated in space in low productivity areas, but should be dispersed between multiple sites in food rich areas to attain complete dispersal. This study provides a framework for testing fisheries management alternatives and behaviour of stocked fish in intensively utilized habitats.Keywords: angling / fisheries management / mark and recapture / Sander lucioperca / stocking strategy Résumé -Gestion de l'empoissonnement de sandre dans le lac Balaton: effet de la saison, de la localisation, de la taille du poisson et de la méthode de déversement sur le taux et la distribution des recaptures. Le sandre Sander lucioperca est un poisson économiquement important dont les populations appauvries ont besoin d'une gestion intensive et d'un empoissonnement de soutien. Nous avons cherché à évaluer l'influence relative de diverses stratégies d'empoissonnement de sandre dans le lac Balaton, en Hongrie, et nous avons testé 60 configurations d'ensemencement (deux saisons Â trois zones lacustres Â zone riveraine Â zone de remise à l'eau au large Â cinq groupes de taille) en relâchant 3 000 animaux d'un an marqués. Les pêcheurs à la ligne ont apporté des données sur 522 poissons recapturés dans les quatre ans suivant le déversement. Le taux de recapture était le plus élevé dans la zone lacustre la plus productive, il augmentait avec la taille des poissons, était plus élevé sur le rivage que dans les eaux hauturières, mais ne différait pas d'une saison à l'autre. Les poissons déversés dans les zones oligotrophes ont parcouru de plus longues distances et se sont dispersés davantage que ceux déversés dans la zone mésotrophe. La taille du poisson a eu peu d'effet, alors que la saison et la méthode de mise à l'eau n'ont eu aucun effet sur la dispersion du poisson. Pour conclure, pour le sandre, il est recommandé de faire des empoissonnements d'automne avec de grands alevins de l'année relâchés directement du rivage plutôt que d'autres solutions. Les quotas de mise en charge peuvent être concentrés...

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“…Consequently, heavy human pressure and cultural eutrophication have changed the biological structure and functioning of the whole lake during the mid 1900s. However, due to a successful nutrient management on the drainage area Lake Balaton has been recovering from this man-made eutrophication since the mid 1990s (Istvánovics et al 2007). Oxygen defi ciency has never been registered in the lake and also concentrations of heavy metals and other toxic pollutants are low or insignifi cant (Herodek et al 1988, Nguyen et al 2005.…”

Section: Study Areamentioning

confidence: 99%

Life history patterns of Procladius choreus, Tanypus punctipennis and Chironomus balatonicus in Lake Balaton

Specziár

2008

Ann. Limnol. - Int. J. Lim.

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Life history patterns of the three most abundant chironomids were analysed in Lake Balaton by monitoring the population dynamics of larvae and the presence of pupal exuviae. Procladius choreus had two generations per year with at least two parallel cohorts during 1996-1999. Tanypus punctipennis had a trivoltine life cycle with occasional parallel cohorts, overlapping generations and long, interrupted emergence periods between 1997 and 1999. At Tihany, Chironomus balatonicus had only one detectable generation between 1995 and 2002. Meanwhile at Keszthely, the abundance of C. balatonicus larvae peaked from autumn to the beginning of summer in

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Updating water quality targets for shallow Lake Balaton (Hungary), recovering from eutrophication

Cited by 46 publications

References 20 publications

Gut content microbiota of introduced bigheaded carps ( Hypophthalmichthys spp.) inhabiting the largest shallow lake in Central Europe

Gut content microbiota of introduced bigheaded carps ( Hypophthalmichthys spp.) inhabiting the largest shallow lake in Central Europe

Management of pikeperch stocking in Lake Balaton: effect of season, area, fish size and method of release on the rate and distribution of recaptures

Life history patterns of Procladius choreus, Tanypus punctipennis and Chironomus balatonicus in Lake Balaton

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