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1

The impact of raised water level on a winter anoxia lake on the population of narrow-clawed crayfish Astacus leptodactylus (Esch.)

100%
Krzywosz T., Traczuk P., Ulikowski D.
Archives of Polish Fisheries
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2009
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tom 17
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nr 2
2

Sanitary and bacteriological examinations of Lake Oswin water

84%
Zmyslowska I., Golas I.
Polish Journal of Environmental Studies
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2003
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tom 12
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nr 3
The investigation was carried out in the “Seven Islands” nature reserve. It has been discovered that in the spring, summer and autumn the number of determined pollution degree indicator bacteria (TVC 22°C and TVC 37°C) of the water of Lake Oświn ranged from tens to thousands of CFU per 1 ml, depending on the research station. The sanitary state indicator bacteria (TC, FC, FS) occurred from single cells to several hundred thousand cells per 100 ml of water. In 36.5% of the lake water samples, the FC:FS ratio was determined as higher than 4.0, but it also ranged from 0.7 to 4.0. In 18% of Lake Oświn water samples it ranged from 0.043 to 0.7, and in 9% it was lower than 0.043. This proves excretal contamination with prevailing excrements of human origin.
3

The bacterial microflora in the fish and water of Lake Oswin

84%
Zmyslowska I., Golas I., Harnisz M.
Acta Scientiarum Polonorum. Piscaria
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2003
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tom 02
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nr 1
4
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
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Fish monogeneans from a shallow, eutrophic Oswin Lake in Poland

67%
Mierzejewska K., Wlasow T., Dzika E.
Wiadomości Parazytologiczne
|
2006
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tom 52
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nr 1
A study was carried out in a shallow, eutrophic Oświn Lake, within Seven Islands Reserve (north-eastern Poland), in order to determine the infection of fish with monogeneans as sensitive indicators of water quality. This paper presents comparative analysis of the occurrence of Monogenea in fishes from two, distinctly separated pools of the lake, differing in environmental conditions. The impact of fish size and sampling season on the infection parameters was also analyzed. Material and methods. In 1998 and 1999, a total of 1091 fish representing 8 dominant species were examined. Samples were collected four times a year (in May, July, August, and October) simultaneously from the eastern and western parts of the lake. Results. 16 species of Monogenea (and some unidentified specimeus) occurred in the fish examined, most of them from the Dactylogyridae family: Dactylogyrus sphyrna, D. auriculatus, D. intermedius, D. anchoratus, D. falcatus, D. tincae, D. wunderi, D. zandti, D. difformis, D. nanus, D. distinguendus, D. crucifer, D. caballeroi. Furthermore, Tetraonchus monenteron (Tetraonchidae), Gyrodactylus elegans (Gyrodactylidae), and Paradiplozoon megan (Diplozoidae) were detected. Monogenea occurred abundantly on the gills of pike, roach, rudd, white bream, carp bream and crucian carp, but rather sporadically in tench and perch. The highest species variety and diversity of monogenean guilds were detected in carp bream and roach. It was proved that D. crucifer and D. difformis were significantly more abundant in the western pool compared to the eastern one. Infection of fish with Dactylogyridae was season-dependent, contrary to the infection of pike with T. monenteron. Intensity of infection of white bream with D. sphyrna and roach with D. crucifer increased with fish body length; such a relationship did not appear for the other monogeneans and their hosts. Conclusion. Presence of common Monogenea in the fish examined, lack of rare species, poor diversity of monogenean guilds and relatively low infection rate could be connected with the low stability of the lake environment. Location-dependent occurrence of D. crucifer and D. difformis indicated that the exchange between fish groups from the eastern and western parts of the lake is limited.
5
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The parasite fauna of fish from eutrophic Oswin Lake at Seven Islands reserve

67%
Wlasow T., Gomulka P., Drozd D., Mierzejewska K.
Wiadomości Parazytologiczne
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1998
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tom 44
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nr 3
6

Fish digeneans from the seven islands ornithological reserve at Oswin Lake Poland. Part I. Posthodiplostomum cuticola von Nordmann, 1832

67%
Mierzejewska K., Wlasow T., Kapusta A., Szymanczyk K.
Acta Ichthyologica et Piscatoria
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2004
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tom 34
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nr 1
Background. The study was carried out in the shallow, eutrophic Oświn Lake, in the area of the Seven Islands ornithological reserve (north-eastern Poland) to determine the infection of fish with digeneans maturing in piscivorous birds. This paper presents a comparative analysis of the occurrence of Posthodiplostomum cuticola in fish from two parts of the reservoir differing in environmental conditions. The effect of fish size and season of sampling on the infection level was analysed. Materials and Methods. Within 1998 and 1999, a total of 1091 fishes of 8 species dominating in the lake were examined. Samples were collected four times a year (in May, July, August, and October) simultaneously from the two examined parts of the lake. Results. Metacercariae of P. cuticola occurred with a high prevalence and intensity of infection in roach, rudd, white bream, and carp bream, and sporadically in crucian carp and European perch. The intensity of infection of fish from the western part of the lake was significantly higher compared with the eastern part; roach from the western pool were much more infected than in the other reservoirs of north Poland. The infection of roach, white bream and carp bream increased with total body length (TL), such a relationship was not reported for rudd. The infection of roach, white bream and carp bream varied significantly in different experimental periods while differences in the infection of rudd in samples were incidental. Conclusion. Location-dependent occurrence of P. cuticola in fishes indicates that interchange between fish groups from the eastern and western pool of Oświn Lake is limited. Infection of rudd was of a more incidental character then the infection of roach, white bream, and carp bream.
7

Fish digeneans from the Seven Islands Ornithological Reserve at Oswin Lake. Part II. The eyeflukes - Diplostomum spp. and Tylodelphys clavata [Von Nordmann, 1832]

67%
Mierzejewska K., Wlasow T.
Acta Ichthyologica et Piscatoria
|
2005
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tom 35
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nr 1
Background. Aparasitological survey was carried out in a shallow, eutrophic Oświn Lake (north-eastern Poland), within the Seven Islands ornithological reserve. We intended to compare the occurrence of eyeflukes in fish from two, distinctly demarcated pools of the lake, differing in environmental conditions. The effect of fish size and sampling season on the infection parameters was analysed and the present state of the parasite faunas was compared to the literature data. Materials and Methods. Within 1998 and 1999, a total of 1091 fishes representing 8 dominant species was examined. Samples were collected four times a year (in May, July, August, and October) simultaneously from the eastern- and western parts of the lake. Results. Diplostomum spp. occurred in all the fish examined, numerously in roach, rudd, white bream, and carp bream. The parasite was less abundant in northern pike, crucian carp, and European perch. Tylodelphys clavata was found in roach and it sporadically occurred in northern pike, rudd, white bream, carp bream, and European perch. The infection rates of rudd and white bream in the eastern part of the lake were significantly higher than the respective values from the western part. The infection with both eyeflukes did not correlate with the fish length. The infection of roach, rudd, white bream, and carp bream with Diplostomum spp. and roach with T. clavata varied significantly in different experimental periods. Conclusion. The eyeflukes as well as P. cuticola were sensitive indicators, reflecting the environmental pressure-both, spatial differences in ecological conditions within the same water body and long-term alterations. Diplostomum spp. did not accumulate with the age of fish. No seasonality was found for Diplostomum spp. or Tylodelphys clavata. Locationdependent occurrence of Diplostomum spp. in rudd and white bream indicated a limited fish interchange between the two pools of the lake.
8

Bacteria and parasites on the gills of pike Esox lucius L. and tench Tinca tinca [L.] as indices of the trophic level of Oswin Lake [Northeastern Poland]

67%
Wlasow T., Zmyslowska I., Lewandowska D., Mierzejewska K., Idzikowski R., Ziomek E.
Archives of Polish Fisheries
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2003
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tom 11
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nr 2
The presence of bacteria and parasites on the gills of pike and tench from Oświn Lake in the Seven Islands Reserve was investigated. Parallel bacteriological analyses of the water were done. The materials were sampled in May-June, July, October 1999, six years after the water level had been increased. The bacteriological and parasitological results both indicate that this body of water is eutrophic. The increase in the incidence of infection with Ergasilus sieboldi and an increase in the number of heterotrophic bacteria were observed simultaneously on the gills. Based on the parasitological and microbiological analysis of gills, the prognosis for the health of pike is unfavorable.
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