Determination of resident brown trout Salmo trutta features by their habitat characteristics in streams of Serbia

Simonović, Predrag; Marić, Ana; Jurlina, Dubravka Škraba; Kanjuh, Tamara; Nikolić, Vera

doi:10.2478/s11756-019-00284-1

Cited by 6 publications

(5 citation statements)

References 50 publications

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“…Knowledge regarding the dissolved salt content is important since each aquatic organism (e.g. brown trout) has its own connectivity requirements as an important habitat variable regarding brown trout (Simonović et al, 2020). The electrical conductivity results of the present study indicates the electrical conductivity values vary between a minimum of 200 μS/cm (site S2) and 437 μS/cm (site S5), meaning the study samples are consistent with the Moroccan standard of 2700 μS/cm, and do not display noticeable deviations.…”

Section: Resultsmentioning

confidence: 99%

“…The electrical conductivity results of the present study indicates the electrical conductivity values vary between a minimum of 200 μS/cm (site S2) and 437 μS/cm (site S5), meaning the study samples are consistent with the Moroccan standard of 2700 μS/cm, and do not display noticeable deviations. For water with salmon, the electrical conductivity should generally be between 150 and 750 μs/cm (Simonović et al, 2020). Monitoring organic matter by means of turbidity measurements indicate a minimum value (1.4 NTU) at the sampling site 1, not exceeding the standard of 5 NTU, and being elevated at all sampling sites with a maximum of 64.15 NTU (site S5).…”

Section: Resultsmentioning

confidence: 99%

Section: Re Sults and Discussionmentioning

confidence: 99%

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Assessment of heavy metal and organic pollution of a salmonid ecosystem: Case of the Oued Guigou River, Middle Atlas (Morocco)

et al. 2023

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The present study focused on evaluating the quality of the Oued Guigou River located in Middle Atlas (Morocco) by studying relevant physicochemical and metallic parameters. Samples for determining the organic matter and trace metal elements trapped in water samples were collected at upstream of Oued Guigou between December 2020 and April 2021. The samples were analysed for physicochemical quality, while the trace metal elements (lead, zinc, copper, chromium, iron, nickel, calcium and magnesium) were determined using ICP‐AES analysis. The results indicated significant organic pollution, as well as standard deviation and average changes in the values of the studied metals, most likely attributable to domestic effluents. The metal content in particular exhibited high values exceeding the recommended Moroccan standard limits, suggesting domestic and agricultural pollution is a potential threat to both the receiving rivers and their associated lakes and reservoirs.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Re Sults and Discussionmentioning

confidence: 99%

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Assessment of heavy metal and organic pollution of a salmonid ecosystem: Case of the Oued Guigou River, Middle Atlas (Morocco)

et al. 2023

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“…Rosenbauer suggested that a fly fisher should pay attention to geology when 'reading' a river before casting a fly [26,49]. Simonović et al showed that the geological structure of a stream's bedrock has an important effect on the character of a trout stream and fish feeding habits [50]. If the stream flows over an insoluble bedrock (e.g., granite), it will be less fertile in terms of available food, and trout will be smaller and will fight for food vigorously.…”

Section: Discussionmentioning

confidence: 99%

What’s on the Menu for the Resident Brown Trout in a Rich Limestone Stream?

Atlagić

Marić

Tubić

et al. 2021

Water

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Examination of brown trout seasonal diet variation and investigation of terrestrial prey importance in a food-rich stream using four indices of prey importance (number and weight abundance, frequency of occurrence, index of relative importance) revealed that aquatic prey constituted the major part of the diet (>90%) throughout the examined period. Despite Gammaridae being the most abundant in the environment, other less abundant organisms appeared to be important prey, including terrestrial organisms, with maximum consumption in September. The electivity index showed a positive selection of rare prey types; Tokeshi’s model revealed a specialist strategy for most of the population, except for those of 1+ age, who were inclining to generalist strategy. Diet diversity increased throughout April to October, and ages 1+ and 2+ exhibited a more diverse diet than older ages. Diet overlap between age classes was considerable, with less overlap observed in the later season. This pattern of differentiation in the diet of brown trout age classes and their feeding plasticity over seasonal scales, as observed in this food-rich stream, provides a starting point for further examination of this topic in streams with similar or different food richness and availability.

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“…This is extraordinary considering Serbia's southerly position in Europe and low altitude. These determine high annual temperature and scarcity of water, which strongly limits habitats convenient for exclusively resident, stream-dwelling brown trout, whose ecological demands are the same as elsewhere (Simonovi c, Mari c, Jurlina, Kanjuh, & Nikoli c, 2020). The great majority of brown trout streams are of the freestone type, with few spring creeks.…”

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confidence: 99%

Effects of run‐of‐river hydropower plants on fish communities in montane stream ecosystems in Serbia

Simonović

Ristić

Milčanović

et al. 2021

River Research & Apps

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Small run-of-river hydropower plants (RRHPs) have revealed strong harmful effects worldwide on stream habitats (e.g., fragmentation and destruction) and decreased fish species, especially anadromous species abundance. Recently, RRHPs have rapidly been installed in Serbia. Most were installed on montane streams because their steep slopes are most convenient for hydropower energy production at minimal costs.Brown trout Salmo trutta are prominent in the fish communities of this rarest type of aquatic ecosystems. Their native molecular diversity reflects a biodiversity hotspot in the Balkans, and they provide attractive fishing opportunities. Records from fishery management plans for highland stream fisheries where RRHPs were installed revealed reduced brown trout biomass compared with streams without RRHPs.Research on six streams with operational RRHPs revealed severe deterioration of habitat, for example, increased water temperature, reduced dissolved oxygen, and increased nutrient contents. Effects on fish communities were evident from a change in their structure. Resident, stream-dwelling brown trout were the most affected species with steep declines in abundance, biomass, and productivity. Fragmentation owing to damming was also reflected by deterioration of their age structure. Unique native brown trout stocks susceptible to adverse effects are difficult to restore by stocking, and fish passages commonly supplied as compensation to overcome the disruption of habitats cannot mitigate the threat posed to the fish.

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Determination of resident brown trout Salmo trutta features by their habitat characteristics in streams of Serbia

Cited by 6 publications

References 50 publications

Assessment of heavy metal and organic pollution of a salmonid ecosystem: Case of the Oued Guigou River, Middle Atlas (Morocco)

Assessment of heavy metal and organic pollution of a salmonid ecosystem: Case of the Oued Guigou River, Middle Atlas (Morocco)

What’s on the Menu for the Resident Brown Trout in a Rich Limestone Stream?

Effects of run‐of‐river hydropower plants on fish communities in montane stream ecosystems in Serbia

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