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Assessment of migration conditions for fish swimming through a semi-natural fish pass on the Nidzica River in Bronocice

Plesiński Karol K., Filipczyk Janusz M., Bień Michał M., Karadağ Mustafa

Journal of Water and Land Development

2023

no. 59

54--65

Fish passes are essential elements for maintaining continuity for migrating fish. Without them, fish would be unable to undertake migration to satisfy their basic life needs. These devices must meet a range of requirements related to the size of individual fish pass elements and the hydrodynamic parameters of the flowing water. Despite efforts, it is not always possible to meet these requirements. There are many causes of errors in the design and construction of fish passes, and each case should be assessed individually. The most severe consequence of these errors is the obstruction of fish migrating upstream. In this study, an analysis of the permeability of a semi-natural fish pass was conducted for fish. This assessment was carried out using two methods. In the first approach, the required geometric dimensions of the fish pass elements were determined based on the dimensions of individuals living in the river channel. In the second approach, the dimensions were extracted from publications dedicated to slot fish passes, as the studied object resembles such a design. The analysis revealed that the fish pass does not fulfil its intended role. All fish species living in the Nidzica River channel face difficulties in passing through the fish pass, including the brook trout, for which the object is specifically designed. The main errors stem from the design and construction, resulting in exceeded values, primarily in the hydrodynamic parameters, rendering the fish pass impassable. The study also aimed to develop corrective recommendations considering the latest scientific developments.

Analysis of Fish Migration Potential Through the Seminatural Fish Pass on an Example the Skórka Barrage on the Głomia River

Hämmerling M., Kałuża T.

Rocznik Ochrona Środowiska

2018

Tom 20, cz. 1

574--587

Water management by artificial water level increasing in rivers, results in environmental changes. One of them is the constraint on migration of fish and other aquatic organisms. In order to facilitate the passage, fish passes are built. The study analysed many parameters related to proper work of the fish pass. The article presents results of a field study of the fish pass located within the Skórka barrage on the Głomia river. The aim of the study was to identify water flow conditions in particular chambers of the fish pass. On the basis of results of the field study, the hydraulic conditions of water flow through the fish pass were determined and referred to the optimum performance parameters of the construction. The results obtained make a basis for discussion of possible problems related to construction and operation of the fish passes resembling „close to nature” structures.

Gospodarowanie wodą poprzez m.in. piętrzenie rzek powoduje zmiany w środowisku przyrodniczym. Jedną z nich jest ograniczenie możliwości migracji ryb i innych organizmów wodnych. W celu ułatwienia ich przemieszania buduje się przepławki. W pracy przedstawiono wyniki badań terenowych dotyczących parametrów hydraulicznych przepławki dla ryb zlokalizowanej w obrębie stopnia wodnego Skórka na rzece Głomii. Celem badań było rozpoznanie warunków przepływu wody w poszczególnych komorach przepławki seminaturalnej. Na podstawie wyników badań terenowych określono warunki hydrauliczne przepływu wody przez przepławkę, odnosząc uzyskane rezultaty do optymalnych parametrów pracy przepławki. Uzyskane wyniki stanowią podstawę do dyskusji na temat możliwych problemów budowy i eksploatacji „bliskich naturze” konstrukcji przepławek dla ryb.