Wyniki wyszukiwania

1

Selected elements of the biology of ruffe [Gymnocephalus cernuus L.] of the Vistula Lagoon

100%

Rychter A.

Bulletin of the Sea Fisheries Institute

|

1997

|

nr 2

2

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

Cechy przeliczalne i mierzalne jazgarza (Gymnocephalus cernuus L.) z jeziora Gopło

72%

Dabrowski J.

Zeszyty Naukowe. Zootechnika. Uniwersytet Technologiczno-Przyrodniczy w Bydgoszczy

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2006

|

tom 36

5-13

3

On some problems of reproduction of ruff, Gymnocephalus cernuus (L., 1758) in the Lake Dabie

72%

Neja Z.

Acta Ichthyologica et Piscatoria

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1988

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tom 18

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nr 2

4

Morphometry of the gill respiratory area in ruffe, Gymnocephalus cernuus (L.)

72%

Satora L., Romek M.

Archives of Polish Fisheries

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2010

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tom 18

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nr 1

5

Ultrastructural observations on Loma acerinae [Jirovec, 1930] comb.nov. [Phylum Microsporidia]

72%

Lom J., Pekkarinen M.

Acta Protozoologica

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1999

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tom 38

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nr 1

6

Contents of some heavy metals in chosen tissues of Gymnocephalus cernuus L.

72%

Hlynczak A. J., Domagala J., Baranowska-Bosiacka I., Rutkowska M.

Biological Bulletin of Poznań. Supplement

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1996

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tom 33

7

Morphophysiological aspects of the embryonic development of ruffe, Gymnocephalus cernuus [L.] under different thermal conditions

72%

Bonislawska M., Korzelecka-Orkisz A., Winnicki A., Formicki K., Szaniawska D.

Acta Ichthyologica et Piscatoria

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2004

|

tom 34

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nr 1

Background. Ruffe, Gymnocephalus cernuus is a small fish inhabiting vast areas of Europe, Asia, and also North America. Its substantial geographical dispersal range in different climatic zones, in waters of different parameters indicates that this is a particularly plastic species. Recent implementation of new fish-processing machinery has increased dramatically the economical importance of ruffe, which is now treated as a gourmet food. In the wake of the increased interest in this fish we decided to study aspects of its developmental biology. Methods. Fertilised eggs and the developing embryos of ruffe were incubated under five different temperature regimes. They were monitored in two planes, horizontal and vertical, using a light microscope fitted with a digital camera and connected to a computer with a monitor and a VCR. The data collected were processed using MultiScan software. Results. Perivitelline space in ruffe constitutes as much 65% of the egg volume. This facilitates movements of an embryo and enhances processes of gas exchange through mixing of perivitelline fluid. It finally contributes to the distribution of the hatching enzyme on the inner surface of the egg shell. Similarly as in the other percid fish, the lack of integration between the "lipid raft" and the embryonic disc, causes the fall of the disc on the lateral side of the vitelline sphere. This lateral position persists throughout all sequential stages of the embryogenesis. The diversified thermal regimes of the development affect the timing of the embryogenesis, as well as the condition, weight, and the size of newly-hatched ruffe larvae. The highest rate of specimens hatched in good condition-marked by the highest weight and body length-was observed at the optimal temperature range of 16-18oC. Newly-hatched larva is small (5 mm body length, 0.10 mm3 of yolk sac volume), active, and fully prepared for independent life in the water. Under the optimal temperature range, determined in the present study, the duration of embryonic development of ruffe (from fertilisation to hatching) was 2122 dh (accumulated degree-hours). Conclusion. The present study constitutes a contribution to the knowledge of the embryonic development of ruffe and its biological sense, emphasizing the morpho-physiological differences between this species-living under, specific, diversified ecological conditions-and other fish.

8

Jazgarz Gymnocephalus cernua (Linnaeus, 1758)

58%

Przegląd Rybacki

|

1998

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tom 23

|

nr 6[43]

9

Percid occupation of submersed riverine macrophytes: food resource partitioning between perch (Perca fluviatilis L.) and ruffe (Gymnocephalus cernuus L.)

58%

Dukowska M., Grzybkowska M., Lik J., Jurasz W.

Oceanological and Hydrobiological Studies

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2012

|

tom 41

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nr 1

10

Mozliwosci zwiekszenia sprzedazy ryb malo cennych polawianych z Zalewie Wislanym

58%

Borczochowski M., Bartel R.

Komunikaty Rybackie

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2003

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nr 6

9-12

11

Seasonal dynamics of Phyllodistomum folium [von Olfers, 1816] [Trematoda, Gorgoderidae] in blue bream, Abramis ballerus [L.] and ruffe, Gymnocephalus cernuus [L.] from the Oder River [Germany-Poland]

58%

Pietrock M., Mattheis T., Kruger R., Meinelt T.

Acta Parasitologica

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1999

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tom 44

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nr 3

From May 1993 to April 1995 a comparative study on the seasonal dynamics of Phyllodistomum folium (von Olfers, 1816) infection was carried out on 633 blue bream, Abramis ballerus (L.) and 266 ruffe, Gymnocephalus cernuus (L.) from the Oder River (Germany/Poland). In blue bream, the monthly prevalences and mean intensities of infection varied irregularly throughout the year: prevalence values attained up to 50% and mean intensities reached 7.6 (range: 1-34) trematodes per infected fish. Conversely, in ruffe a temperature dependent occurrence of P. folium was observed: both the prevalence and mean intensity of infection were significantly higher at a water temperature beneath 10°C than above, with a highest monthly prevalence of 60.8% and a mean intensity of 2.9 (range: 1-7) P. folium. Juvenile and gravid trematodes were found in blue bream and ruffe at all seasons. Based on this study, it is concluded that (a) infection of fish is possible throughout the year, and that (b) modifications in course of infection are determined by the host species rather than on water temperature.

12

The growth rate of the six selected fish species inhabiting in the Polish part of the Vistula Lagoon

58%

Trella K.

Bulletin of the Sea Fisheries Institute

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2003

|

nr 3

13

On the role of paratenic hosts in the life cycle of the nematode Anguillicola crassus in the Vistula Lagoon, Poland

58%

Rolbiecki L.

Acta Ichthyologica et Piscatoria

|

2002

|

tom 32

|

nr 2

Anguillicola crassus is an Asian nematode accidentally introduced to Europe and parasitising the swimbladder of European eels. Planktonic copepods are the major intermediate hosts but the success of this parasites depends on small fishes, acting as paratenic hosts and transmitting the nematode to eels. The role played by cyprinids and percids in the life cycle of A. crassus in the Vistula Lagoon was analysed. A total of 2398 fish specimens (1091 percids and 1307 cyprinids) were examined within December 1994-March 1997. The presence of the nematode was recorded in zander (Sander lucioperca), European perch (Perca fluviatilis), ruffe (Gymnocephalus cernuus), carp bream (Abramis brama), ziege (Pelecus cultratus), and roach (Rutilus rutilus), the ruffe being the most heavily infected fish species. The present findings advance our knowledge on the biology A. crassus and will help to predict its spread to other bodies of water.

14

The importance of benthic fauna in the diet of small common bream Abramis brama [L.] roach Rutilus rutilus [L.], pikeperch Sander lucioperca [L.] and ruffe Gymnocephalus cernuus [L.] in the Wloclawek Reservoir

58%

Kakareko T.

Archives of Polish Fisheries

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2002

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tom 10

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nr 2

The food composition of small common bream, roach, pikeperch and ruffe was studied in the shore area of the Włocławek Reservoir between July and October 1999. Zoobenthos and pelagic Chironomidae pupae dominated. Rotifers, copepods and cladoceran pelagic zooplankton were almost not consumed at all. Common bream fed mainly on benthic cladoceran Chydoridae and Chironomidae larvae. Roach consumed vegetation, Chironomidae larvae and small molluscs Sphaeriidae. Ruffe ate Chironomidae larvae, and pikeperch ate fish and various developmental stages of Chironomidae. Pelophilous chironomid forms, mainly from the genus Chironomus, dominated among the consumed larvae. Due to its exceptional abundance, the benthic fauna in the Włocławek Reservoir is an attractive food source for fish, and it plays an important role in their diet from the earliest life stages onwards. The benthic fauna also provides good developmental conditions, especially for typical benthic feeders.

15

Reexamination of the gill respiratory surface area in the pike, Esox lucius, and remarks on the other fish species

58%

Jakubowski M.

Acta Biologica Cracoviensia. Series Zoologia

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1992-1993

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tom 34-35

Ograniczanie wyników

Selected elements of the biology of ruffe [Gymnocephalus cernuus L.] of the Vistula Lagoon

Cechy przeliczalne i mierzalne jazgarza (Gymnocephalus cernuus L.) z jeziora Gopło

On some problems of reproduction of ruff, Gymnocephalus cernuus (L., 1758) in the Lake Dabie

Morphometry of the gill respiratory area in ruffe, Gymnocephalus cernuus (L.)

Ultrastructural observations on Loma acerinae [Jirovec, 1930] comb.nov. [Phylum Microsporidia]

Contents of some heavy metals in chosen tissues of Gymnocephalus cernuus L.

Morphophysiological aspects of the embryonic development of ruffe, Gymnocephalus cernuus [L.] under different thermal conditions

Jazgarz Gymnocephalus cernua (Linnaeus, 1758)

Percid occupation of submersed riverine macrophytes: food resource partitioning between perch (Perca fluviatilis L.) and ruffe (Gymnocephalus cernuus L.)

Mozliwosci zwiekszenia sprzedazy ryb malo cennych polawianych z Zalewie Wislanym

Seasonal dynamics of Phyllodistomum folium [von Olfers, 1816] [Trematoda, Gorgoderidae] in blue bream, Abramis ballerus [L.] and ruffe, Gymnocephalus cernuus [L.] from the Oder River [Germany-Poland]

The growth rate of the six selected fish species inhabiting in the Polish part of the Vistula Lagoon

On the role of paratenic hosts in the life cycle of the nematode Anguillicola crassus in the Vistula Lagoon, Poland

The importance of benthic fauna in the diet of small common bream Abramis brama [L.] roach Rutilus rutilus [L.], pikeperch Sander lucioperca [L.] and ruffe Gymnocephalus cernuus [L.] in the Wloclawek Reservoir

Reexamination of the gill respiratory surface area in the pike, Esox lucius, and remarks on the other fish species