Wyniki wyszukiwania - Biblioteka Nauki

1

Management of European whitefish [ Coregonus lavaretus L.S.L.] stocks in Lake Paasivesi, eastern Finland

100%

Heikinheimo-Schmid O.

Polskie Archiwum Hydrobiologii

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1992

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tom 39

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nr 3-4

2

Badania ichtiofauny jako podstawa racjonalnej gospodarki rybackiej i zarządzania zbiornikiem zaporowym na przykładzie zbiornika goczałkowickiego

84%

Łozowski B. , Małkowski E. , Woźnica A. , Łaszczyca P. , Koprowski R. , Wróbel Z. , Pasierbiński A. , Migula P. , Gwiazda R. , Pszczeliński Ł. , Siudy A.

Gospodarka Wodna

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2014

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tom Nr 8

308--311

PL

W artykule podjęto próbę odpowiedzi na pytanie dlaczego w zbiorniku zaporowym konieczna jest racjonalna gospodarka rybacka. Wskazano, że główną rolę w zapewnieniu równowagi w ekosystemie takiego zbiornika pełnią ryby, oraz podkreślono ich rolę w utrzymaniu dobrej jakości wody w akwenie. W artykule omówiono narzędzia wspomagające gospodarkę rybacką oraz wady i zalety różnych sposobów oceny stanu ichtiofauny w zbiornikach. Przedstawiono również innowacyjny sposób szacowania ilości ryb za pomocą analizy obrazów sonarowych opracowanej w ramach Projektu ZiZOZap.

EN

The article attempts to answer the question why a dammed reservoir requires a rational fishing management. It indicates that the main role in ensuring balance of such reservoir's ecosystem is played by fish aand it underlines their role in maintaining a good quality of water in the water body. The article discusses the tools supporting the fishing management, as well as advantages and disadvantages of different methods of the ichthyofauna condition assessment in reservoirs. The authors also present an innovative method of estimating the quantity of fish, using sonar images analysis, elaborated as part of the ZiZOZap project.

3

Klasyfikacja i mozliwosci rybackiego wykorzystania malych zbiornikow wodnych na terenie wojewodztwa olsztynskiego

84%

Rozanski S.

Acta Academiae Agriculturae ac Technicae Olstenensis. Protectio Aquarum et Piscatoria

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1995

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tom 20

63-70

4

Problemy rybackiego zagospodarowania starorzeczy w krajobrazie rolniczym Doliny Lyny

84%

Glinska-Lewczuk K.

Zeszyty Problemowe Postępów Nauk Rolniczych

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2005

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tom 503

91-100

PL

W pracy przedstawiono możliwości i problemy zagospodarowania starorzeczy na stawy rybne lub łowiska rekreacyjne dla wędkarzy w kontekście cech morfologicznych starorzeczy i własności fizykochemicznych ich wód. Zespół cech środowiska przyrodniczego starorzeczy, jak: morfologia, warunki termiczno-tlenowe, a także parametry jakości wody stwarzają możliwość ekstensywnego chowu ryb. Starorzecza mają dogodne warunki dla egzystencji organizmów stagnofilnych oraz chowu ryb karpiowatych limnofilnych (karp, lin, karaś) oraz drapieżnych (szczupak, sum). Na przykładzie starorzecza zaadaptowanego na staw rybny w Smolajnach stwierdzono w pierwszym roku duży przyrost jednostkowy ryb, tj. ok. 1,32 kg na sztukę karpia i 1,38 kg na sztukę suma na pokarmie naturalnym. Pozytywnym czynnikiem w funkcjonowaniu stawu jest stały dopływ dobrze natlenionej wody rzecznej. Jednakże reżim rzeczny jest także jednym z czynników przesądzających o tym kierunku wykorzystania i wymuszającym zakres inwestycji. Ponadto efektywność inwestycji obniża wykorzystanie pomp w celu osuszenia zbiorników, a także powszechne kłusownictwo. Z uwagi na niewielką opłacalność inwestycji, prezentowany obiekt służy głównie celom dydaktycznym, a w przyszłości wykorzystany zostanie także na łowisko rekreacyjne.

EN

The study was carried out to recognize the possibilities and problems concerning management of oxbow lakes as the fish ponds and also as the terrain of recreation fishing, consider morphological qualities of oxbow lakes, chemical and physical parameters of water. The complex of natural environment conditions such as morphology, oxygen and thermal conditions as well as the water quality create the possibility for extensive fish breeding in such reservoirs. Oxbow lakes are favorable for living of stagnant water organisms as well as breeding of cyprinids (carp Cyprinus carpio, tench Tinca tinca, crucian carp Carassius carassius) and predatory fish (pike Esox lucius, sheatfish Silurus glanis). First year of breed gave quite large annual growth of carp on natural food (on average 1375 g). An advantageous factor in the pond operation system is a constant inflow of well oxygenated river water. However, the hydrological regime of river is one of main factors limiting transformation of an oxbow lake into fish pond. Moreover, the efficiency of investment is not too high due to difficult ponds emptying that needs the pumps to be used. There is also a serious problem with poaching. Due to low economic efficiency presented object is assigned mainly for educational purposes and its recreational utilization may be possible in the future.

5

The ichthyofauna of littoral of two shallow lakes on background of fishery management and angling pressure

84%

Rechulicz J. , Plaska W. , Tarkowska-Kukuryk M.

Teka Komisji Ochrony i Kształtowania Środowiska Przyrodniczego

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2014

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tom 11

6

Stockings and changes in peled [ Coregonus peled [Gmelin] ] stocks and fishery management in the Lokka and Porttipatha reservoirs, Northern Finland

84%

Salonen E. , Mutenia A.

Polskie Archiwum Hydrobiologii

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1992

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tom 39

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nr 3-4

7

Fishing pattern and interactions of fleet components in the Argyrops spinifer (Actinopterygii: Perciformes: Sparidae) fisheries of the Arabian Sea, Oman

67%

Al-Mamry J. , Ben Meriem S. , McCarthy J. D. , Richardson C. A.

Acta Ichthyologica et Piscatoria

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2011

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tom 41

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nr 1

EN

Background. The influx of foreign fishing vessels in the Arabian Sea, during the mid 1990’s, has sparked some conflicts between artisanal and industrial fleets and raised concerns related to the resource management implications of fish stocks in the region. To address the lack of management data on the basic biology and stock assessment for targeted species, the Ministry of Fisheries Wealth in Oman initiated this study with a view to contributing towards the development of a management plan for the sustainable exploitation of the living resources of the sea in this region. Materials and methods. A database including biological parameters, length-frequency distributions and catches of king soldier bream, Argyrops spinifer (Forsskål, 1775), in Oman according to fleet (gear/technique) and region was compiled by monthly sampling in 2001 to 2002. In this study, length cohort and yield per recruit analyses were examined after simulating changes in fishing effort, in length at first capture and introducing a closed season for trawlers. Results. The results showed that: (i) the status of the stock is healthy, the average fishing mortality rate is moderate (0.1) and acts in general on the adult fraction of the stock. The fishing pattern differs, however, among fleets with some fleet components fishing, in part, for immature king soldier bream. (ii) An increase in total fishing effort would not lead to any long-term substantial increase of the catch (according the uncertainty of M value); however, the spawning stock biomass would decrease significantly. This measure affects negatively fleets that target the larger specimens. (iii) A moderate (±20%) modification of minimum length limit in catches would not affect, substantially, the sustainable yield and the spawning stock biomass. (iv) Any regulation of trawler fishing by closed season (i.e. restricted trawler activities during some seasons) would not have a significant effect on the long-term yield. Conclusion. The current pattern of exploitation and fishing effort acting on the A. spinifer stock are optimal and no changes to global fishing or length at first capture are recommended. Also, with the actual fishing effort of trawlers, no closed season is suggested. However, fleet components whose catches include some juvenile fraction should adopt more selective gear as used by the hand line fishery in the Al-Wusta region.

8

The effect of subjective fish scale ageing on growth and recruitment analyses: a case study from the UK

67%

Musk R. S. , Britton J. R. , Axford S. N.

Acta Ichthyologica et Piscatoria

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2006

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tom 36

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nr 1

EN

Re-ageing of scales sampled in 1985 from the population of roach, Rutilus rutilus (L.), of the River Stour, England, revealed a high degree of subjectivity in their ageing, resulting from contrasting interpretations of similar scale features between practitioners. Compared with ages attained in 1985, re-ageing of the scales in 2004 only found agreement >80% at ages 1, 2, and 4 years. By age 9, agreement had dropped to 6%. The re-ageing revealed the presence of year classes that had previously been thought to have already died out and suggested their recruitment strength was associated with water temperatures in the first year of life of cohorts.

9

Fish culture as a factor affecting primary production

67%

Rybka A. , Puchala R. , Pilarczyk M.

Oceanological and Hydrobiological Studies

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2008

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tom 37

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nr Suppl.1

10

Ireland's changing freshwater habitats: anthropogenic impacts, fishery management problems and ecohydrological perspectives

67%

McCarthy T. K. , Cullen P.

International Journal of Ecohydrology and Hydrobiology

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2002

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tom 02

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nr 1-4

EN

The adverse changes to Ireland’s rivers and lakes, that result from deterioration in water quality, channelization and alteration of natural hydrological features, have impacted on the habitats of a variety of important fish stocks. These anthropogenic effects, and the recent changes in landscape management, which also threaten the other aspects of aquatic biodiversity of many Irish river catchments are reviewed. The importance of conserving ecotone features and of adopting an integrated ecological approach to monitoring of aquatic environmental change is discussed. Application of ecohydrological principles, for fish conservation and fisheries management is recommended. Further interdisciplinary studies and elaboration of new strategies for sustainable development of Ireland’s freshwater resources are outlined.

11

The additional benefits of fish farming in small water bodies

59%

Rozanski S.

Acta Academiae Agriculturae ac Technicae Olstenensis. Protectio Aquarum et Piscatoria

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1996

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tom 22

83-94

12

Wystepowanie sandacza [Stizostedion lucioperca L.] w obrebie zlewni kompleksu wielkich jezior mazurskich