Wyniki wyszukiwania

1

Food composition and selectivity of juvenile perch (Perca fluviatilis L.) against food resources in the mouth of the Odra River

100%

Wolska M., Mazurkiewicz-Zapalowicz K., Formicki K.

Electronic Journal of Polish Agricultural Universities. Series Fisheries

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2016

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tom 19

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nr 1

2

Development of a resource assessment system for Baltic coastal fish stocks with perch [Perca fluviatilis L.] as a model species

100%

Thoresson G., Kangur M., Repecka R., Saat T., Vitinsh M.

Bulletin of the Sea Fisheries Institute

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1997

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nr 3

3

Preliminary results regarding the impact of perch-roach gillnets on pikeperch resources in the Vistula Lagoon

100%

Psuty-Lipska I.

Bulletin of the Sea Fisheries Institute

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2003

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nr 2

4

Age, growth, and condition of perch in the Odra Estuary

100%

Szypula J., Rybczyk A.

Folia Universitatis Agriculturae Stetinensis. Piscaria

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2001

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tom 28

5

Length distribution of perch [Perca fluvatilis L., 1758] trawl-fished in 2000 in the Pomeranian Bay

100%

Krol S., Dudko S., Lukasiewicz G., Swiniarski J.

Folia Universitatis Agriculturae Stetinensis. Piscaria

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2001

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tom 28

6

Morphometry of the gill respiratory area in the perch, Perca fluviatilis

100%

Satora L., Jakubowski M.

Acta Biologica Cracoviensia. Series Zoologia

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1995

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tom 37

7

Temperature effect on hormonally induced spawning in perch [Perca fluviatilis]

100%

Kouril J., Linhart O.

Polskie Archiwum Hydrobiologii

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1997

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tom 44

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nr 1-2

8

Variability of perch, Perca fluviatilis L. helminth fauna in the Gulf of Gdansk, Baltic Sea

100%

Rolbiecki L., Rokicki J., Szugaj K.

Oceanological Studies

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2002

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tom 31

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nr 1-2

9

Impact of different fishing seasons on the fatty acids profile, cholesterol content, and fat in the muscles of perch, Perca fluviatilis L. from the Wloclawski Reservoir (central Poland)

84%

Stanek M., Dabrowski J., Roslewska A., Kupcewicz B., Janicki B.

Archives of Polish Fisheries

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2008

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tom 16

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nr 2

The aim of the study was to compare the fatty acids profile, fat content, and total cholesterol in the muscles of female perch, Perca fluviatilis L., caught in fall and spring. The group of fish examined was comprised of perch caught in the Włocławski Reservoir in December 2005 and June 2006. Analysis indicated that the muscles of the fish caught in fall had higher total cholesterol and fat content (53.91 mg 100 g-1 and 2.17%, respectively) in comparison with the level of these parameters in the muscles of perch caught in spring (44.74 mg 100 g-1 and 1.94%, respectively). In both seasons, the main saturated fatty acid (SFA) was C16:0, the monounsaturated fatty acids (MUFA) were dominated by C18:1 n-6, and the highest percentage of polyunsaturated fatty acids (PUFA) was of C20:5 n-3. The total SFA and PUFA was higher in the muscles of perch caught in fall at 47.53 and 28.65%, respectively, in contrast to the values of these acids in spring, which were 43.02% and 21.73%, respectively. Total MUFA in fall (23.83%) was lower than in spring (32.24%).

10

Two different feeding tactics of young-of-the-year perch, Perca fluviatilis L., inhabiting the littoral zone of the lowland Sulejow Reservoir (Central Poland)

84%

Frankiewicz P., Wojtal-Frankiewicz A.

International Journal of Ecohydrology and Hydrobiology

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2012

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tom 12

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nr 1

11

RNA/DNA ratio as an indicator of the impact of long-term accumulative contamination for the assessment of river degradation – a pilot study

84%

Mankiewicz-Boczek J., Kaczkowski Z., Godowska M., Zalewski M.

International Journal of Ecohydrology and Hydrobiology

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2010

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tom 10

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nr 2-4

To improve our understanding of the hierarchy of human induced modifications of the natural environment, with particular regard to the controlling strength of the habitat or chemical impacts, it was found to be appropriate to employ indicators at a molecular level. This paper examines the potential use of the analysis of the RNA/DNA ratio for the evaluation of the ecological status of two rivers of Central Poland. The study confirmed that analysis of the RNA/DNA ratio has the potential to be a sensitive indicator of river degradation. It is also a useful screening method for the evaluation of the impact of prolonged sub-lethal contamination of freshwater ecosystems dominated by tolerant fish species such as the perch, Perca fluviatilis L.

12

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The influence of age on the occurrence of internal parasites in perch (Perca fluviatilis L.) from Lake Goreckie in Wielkopolski National Park

84%

Andrzejewski W., Uzar T., Pekala-Safinska A., Urbanska M., Serwanska-Leja K., Pociecha A.

Roczniki Naukowe Polskiego Towarzystwa Zootechnicznego

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2021

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tom 17

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nr 4

13

Microtubular network of the gelatinous egg envelope within the egg ribbon of European perch, Perca fluviatilis L.

84%

Formicki K., Smaruj I., Szulc J., Winnicki A.

Acta Ichthyologica et Piscatoria

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2009

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tom 39

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nr 2

147-151

Background. After their deposition in water, eggs of perch form characteristic, long gelatinous ribbons (strands) floating within the water column. The ultrastructure of the external gelatinious egg envelope of members of the family Percidae was believed to be amorphous. The aim of the presently reported study was to describe the ultrastructure and function of the gelatinous egg envelope composing the perch egg ribbon. Materials and Methods. Fresh eggs of European perch, Perca fluviatilis L., were collected, in the form of egg ribbons, from females caught at the spawning grounds on the Odra River side canal Dziewoklicz, within the city limits of Szczecin, Poland. After fertilization eggs were fixed in 4%formaldehyde. In the laboratory, the commonly accepted techniques (dehydration, critical-point drying, sputter coating) were used to prepare samples for examination with a scanning electron microscope (SEM). The observations were photographically documented. Results. Closely below the surface of the gelatinous egg ribbon we observed a network of microtubules. These microtubules opened at the egg ribbon surface in the form of ring-like or nozzle-like pores. Conclusion. The gelatinous egg envelope of perch is a complex microtubular network that likely performs a skeletal role for the egg ribbon. Our results also suggest that the regular surface openings of the aforementioned network may play an attachment function (micro-suckers) reciprocally between eggs and between eggs and other objects, thereby facilitating the fastening the eggs to underwater vegetation.

14

Age and growth rate of perch [Perca fluviatilis L.] from a special angling lake Skomielno

84%

Rechulicz J.

Annales Universitatis Mariae Curie-Skłodowska. Sectio EE: Zootechnica

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2008

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tom 26

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nr 1

8-18

15

Age and growth of the perch [Perca fluviatilis L.] in the Solina and Roznow dam reservoirs

84%

Epler P., Luszczek-Trojnar E., Socha M., Drag-Kozak E., Szczerbik P.

Acta Scientiarum Polonorum. Piscaria

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2005

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tom 04

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nr 1-2

16

Occurrence of Ancyrocephalus paradoxus [Ancyrocephalidae; Monogenea] in pike perch from the Vistula Lagoon

84%

Rolbiecki L.

Wiadomości Parazytologiczne

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1998

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tom 44

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nr 3

17

Catch monitoring as a tool in responsible management of perch stock in the Pomeranian Bay

84%

Dudko S., Krol S., Swiniarski J.

Folia Universitatis Agriculturae Stetinensis. Piscaria

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2001

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tom 28

18

Artificial spawning of Eurasian perch, Perca fluviatilis L. using Ovopel

84%

Kucharczyk D., Szczerbowski A., Luczynski M. J., Kujawa R., Mamcarz A., Wyszomirska E., Szabo T., Ratajski S.

Archives of Polish Fisheries

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2001

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tom 09

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nr 1

Spermiation and ovulation in the Eurasian perch Perca fluviatilis L. were induced with Ovopel, pellets containing GnRH, and then compared with hCG and CPE. Males from the control group produced a significantly smaller volume of milt (average about 17mlkg BW⁻¹) than those from the hormonally-treated groups (over 24 ml kg BW⁻¹). Spermatozoa motility was similar in both the treated and untreated males, but the fertilization ability varied significantly between individual males. Over 90% of the treated females ovulated. Ovulation in the control group was noted in a limited number of females. Mean embryo survival to the eyed-egg-stage was over 50% in the treated groups, in contrast to 7.5% in the control group. The poor quality of perch gametes might result from high water temperature oscillations before the natural spawning season. The quality of eggs, expressed as survival to the eyed-egg-stage, decreased with latency time.

19

Size and fecundity of perch females at age of maturity

84%

Ciepielewski W., Hornatkiewicz-Zbik A.

Acta Scientiarum Polonorum. Piscaria

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2006

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tom 05

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nr 2

20

Ovarian structure and development in juvenile perch, Perca fluviatilis [L.] under intensive breeding [short communication]

84%

Kopiejewska W., Szczerbowski A.

Acta Scientiarum Polonorum. Piscaria

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2005

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tom 04

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nr 1-2

Ograniczanie wyników

Food composition and selectivity of juvenile perch (Perca fluviatilis L.) against food resources in the mouth of the Odra River

Development of a resource assessment system for Baltic coastal fish stocks with perch [Perca fluviatilis L.] as a model species