Influence d'un écran électrique en aval d'une usine hydroélectrique sur le comportement de remontée du saumon atlantique (Salmo salar)

This paper presents a comprehensive study of the impact of damming on the spawning migrations of Barbus barbus in the canalized River Meuse (Southem Belgium). A Denil fish pass on the Ampsin-Neuville dam was controlled 251 times in 1989-1993. The most stnking feature is the almost complete absence of barbel in 1990-1993 (15 fishes in 4 years). Most captures of barbel in the fish pass in 1989 were clumped within a few days (mid-May) and related with spawning migrations. Stepwise multiple regression analyses revealed that attractivity was the major condition set allowing barbel to migrate successfully through the pass, while feasibility parameters (water velocity) were found not to be relevant. The variables involved in the attractivity condition set refer indirectly to the influence of water catchment by a hydroelectric plant and to the relative importance of the flow in the pass. The study concludes that this additional condition set significantly interferes with the natural environmental stimuli triggering spawning migrations in barbel and questions the effectiveness of the thermally-related reproductive strategy of the species in an environment with restricted longitudinal connectivity. This statement is discussed in parallel with the recent evolution of barbel populations in canalized rivers.

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Exploring the effect on marine fish of electric fields of a fish‐protection

Столбунов

Salienko

Заботкина

et al. 2022

Ûg Ross.: èkol. razvit.

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Aim. Experimental assessment of the impact of electric fields generated by the Electronic Programmable Complex Fish‐protecting Facility on the Electric Principle (EP EPRCFF) on the most common fish species of the Black Sea.Material and Methods. Experimental studies were conducted at the marine test site in the Quarantine Bay of the Black Sea (May‐September, 2021). The following were investigated on larvae, juvenile and adult fish of common species: behavioral responses to electrical fields, survival during and after exposure to the electric field of the fish barrier and the effects of electricity on the reproductive system and biochemical parameters of fish.Results. The features of behavior and distribution of larvae, juvenile and adult fish in the electric field of a fish barrier in modes of different intensity have been analysed. Survival estimation of fish during and after electric influence of the fish barrier has been carried out. The data on the influence of the electric screen on the reproductive system of fish and the biochemical characteristics of their internal organs were analysed.Conclusion. The larvae of fish exhibit a clear “first reaction” to the impact of the electric fish screen. However, there is no avoidance effect (i.e. escape of fish larvae from the area of the working electrode system). The juveniles actively move from the operation zone of the fish‐protective device, avoiding the influence of the electric field. The maximum distance from the electrode system EPRCFF was recorded in adult fish. Significant differences were not revealed in the direct assessment of the survival rate of control and experimental groups of individuals of different species of marine fish after exposure to the electric fish barrier. Some differences on the reproductive system of the fish species studied in the structure of gonads and reactivity of cells were noted under the influence of the electric barrier. The biochemical status of the internal organs under electrical action differed in various species of marine fish.

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Influence d'un écran électrique en aval d'une usine hydroélectrique sur le comportement de remontée du saumon atlantique (Salmo salar)

Cited by 3 publications

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A comprehensive assessment of the failure ofBarbus barbusspawning migrations through a fish pass in the canalized River Meuse (Belgium)

Exploring the effect on marine fish of electric fields of a fish‐protection

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