scholarly journals Evaulation of the Quality of an Aquatic Habitat on the Drietomica River

2014 ◽  
Vol 22 (1) ◽  
pp. 43-48
Author(s):  
Ivan Stankoci ◽  
Jana Jariabková ◽  
Viliam Macura
Keyword(s):  
Salmo Trutta ◽  
Ecological Status ◽  
Aquatic Habitat ◽  
Main Step ◽  
Northwestern Part ◽  
River Habitat ◽  
Habitat Simulation ◽  
Brown Trout Salmo Trutta ◽  
The One

Abstract The ecological status of a river is influenced by many factors, of which the most important are fauna and flora; in this paper they are defined as a habitat. During the years 2004, 2005, 2006 and 2011, research on the hydroecological quality of a habitat was evaluated in the reference section of the Drietomica River. Drietomica is a typical representative river of the Slovak flysch area and is located in the region of the White Carpathians in the northwestern part of Slovakia. In this article the results of modeling a microhabitat by means of the Instream Flow Incremental Methodology (IFIM) are presented. For the one-dimensional modeling, the River Habitat Simulation System (RHABSIM) was used to analyse the interaction between a water flow, the morphology of a riverbed, and the biological components of the environment. The habitat ´s hydroecological quality was evaluated after detailed ichthyological, topographical and hydro-morphological surveys. The main step was assessing the biotic characteristics of the habitat through the suitability curves for the Brown trout (Salmo trutta m. fario). Suitability curves are a graphic representation of the main biotic and abiotic preferences of a microhabitat´s components. The suitability curves were derived for the depth, velocity, fish covers and degree of the shading. For evaluating the quality of the aquatic habitat, 19 fish covers were closely monitored and evaluated. The results of the Weighted Usable Area (WUA = f (Q)) were evaluated from a comprehensive assessment of the referenced reach of the Drietomica River.

scholarly journals Improvement in physical river habitat quality in response to river restoration measures

Geografie ◽  
2016 ◽  
Vol 121 (1) ◽  
pp. 54-78
Author(s):  
Kateřina Kujanová ◽  
Milada Matoušková
Keyword(s):  
Habitat Quality ◽  
River Restoration ◽  
Field Survey ◽  
Reference Conditions ◽  
Ecological Status ◽  
River Habitat ◽  
Restoration Measures ◽  
Hydromorphological Quality

The main goal of this paper is to verify the hypothesis that application of appropriate restoration measures can lead to an improvement in river habitat quality and to achieve good hydromorphological conditions within the ecological status under the Water Framework Directive 2000/60/ES. The study includes an analysis of river network modifications founded on comparing historical and present-day maps, a determination of regional hydromorphological reference conditions based on a field survey and measurements, an assessment of hydromorphological quality of the studied water body and a proposal of appropriate restoration measures. The effects on improvement in hydromorphological status were predicted on the basis of a simulation of hydromorphological conditions after the application of proposed restoration measures. Overall, at least a good hydromorphological status would be achieved. The study proved that it is essential to carry out a hydromorphological survey including a determination of reference conditions as it provides some outputs necessary for a proposal and application of efficient restoration.

scholarly journals Meat Quality of Rainbow Trout (Oncorhynchus mykiss) and Brown Trout (Salmo trutta fario) Farmed in Bulgaria

2019 ◽  
Author(s):  
G. Zhelyazkov ◽  
D. Stratev
Keyword(s):  
Rainbow Trout ◽  
Brown Trout ◽  
Salmo Trutta ◽  
Dry Matter ◽  
Nutritional Value ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Brown Trout Salmo Trutta ◽  
Water Holding ◽  
Salmo Trutta Fario

Background: Fish meat is outlined with high nutritional value having essential amino acids, unsaturated fatty acids, mineral and vitamins. In this short report, we compared the meat quality of rainbow trout (Oncorhynchus mykiss) and brown trout (Salmo trutta fario) farmed in Bulgaria. Methods: Ten fishes from each species were purchased from a fish farm and their morphological parameters were determined. The technological properties of meat were analyzed such as water holding capacity and cooking loss as well as chemical composition such as water content, protein, fat, dry matter, and ash. Results were processed by STATISTICA 6.0 software. Results: Higher values were significantly determined in brown trout for standard body length (p<0.05), body height (p<0.001), and body width (p<0.01); while differences in total body length were not relevant (p>0.05). Water holding capacity of rainbow trout meat (9.49±3.86%) was considerably better (p<0.001) than that of brown trout meat (15.85±1.11%). Cooking loss in rainbow trout (31.78±6.17%) was lower (p<0.001) than that of brown trout meat (44.48±4.20%). Protein, fat, and dry matter contents were higher in brown trout (p<0.001). No statistically significant differences were found out with respect to ash content (p>0.05). Conclusion: Meat of rainbow trout cultivated in Bulgarian farm exhibited better technological properties than that of cultivated brown trout; however, nutritional value of brown trout meat was superior.

Effect of bisphenol A on maturation and quality of semen and eggs in the brown trout, Salmo trutta f. fario

2005 ◽  
Vol 75 (3) ◽  
pp. 213-224 ◽  
Author(s):  
Franz Lahnsteiner ◽  
Beate Berger ◽  
Manfred Kletzl ◽  
Thomas Weismann
Keyword(s):  
Bisphenol A ◽  
Brown Trout ◽  
Salmo Trutta ◽  
Brown Trout Salmo Trutta

The Effects of Different Stunning Techniques on Meat Quality of Brown Trout (Salmo Trutta Fario)

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Murat Genc ◽  
Gonca Alak ◽  
Muhammed Atamanalp ◽  
Nilufer Sabuncuoglu ◽  
Esat Mahmut Kocaman ◽  
...  
Keyword(s):  
Meat Quality ◽  
Brown Trout ◽  
Salmo Trutta ◽  
Brown Trout Salmo Trutta ◽  
Salmo Trutta Fario

The influence of spawning habitat restoration on juvenile brown trout (Salmo trutta) density

2007 ◽  
Vol 64 (3) ◽  
pp. 509-515 ◽  
Author(s):  
Daniel Palm ◽  
Eva Brännäs ◽  
Fabio Lepori ◽  
Kjell Nilsson ◽  
Stefan Stridsman
Keyword(s):  
Brown Trout ◽  
Habitat Complexity ◽  
Salmo Trutta ◽  
Habitat Restoration ◽  
Size Composition ◽  
Spawning Habitat ◽  
Gravel Beds ◽  
Brown Trout Salmo Trutta ◽  
Juvenile Brown Trout

Between 1992 and 2003, we assessed the density of age-0+ brown trout (Salmo trutta) in a channelized stream in northern Sweden, which was restored using two different schemes. One section of the stream was restored by the addition of boulders and reconstruction of gravel beds (boulder + gravel section), whereas another section was restored through addition of boulders only (boulder-only section). In addition, we compared the substrate size composition of gravel beds and the egg-to-fry survival between the two stream sections, and we related the density of age-0+ brown trout to the area of reconstructed gravel beds. After the restoration, the density of age-0+ brown trout increased significantly in the boulder + gravel section and was positively correlated with the area of reconstructed gravel beds. By contrast, the density of age-0+ brown trout did not change in the boulder-only treatment. Egg-to-fry survival was significantly higher in the boulder + gravel section compared with the boulder-only section, probably because of the higher content of sand and fines in the gravel beds of the latter treatment. This study shows that the density of age-0+ brown trout was limited by the availability and quality of spawning substrate rather than by the structural habitat complexity.

Evaluation of the Properties of Humus Liquid of Earthworm Eisenia Foetida Obtained from Different Rachis

2017 ◽  
Vol 3 (02) ◽  
Author(s):  
Ramiro Remigio Gaibor Fernández ◽  
Abraham Adalberto Bayas Zamora ◽  
Galo Israel Muñoz Sánchez ◽  
Cristhian Adrián Rivas Santacruz
Keyword(s):  
Plant Growth ◽  
Fulvic Acids ◽  
Cattle Manure ◽  
Eisenia Foetida ◽  
Humic And Fulvic Acids ◽  
Livestock Manure ◽  
A Value ◽  
The One ◽  
Liquid Slurry

The objective of the present investigation was to evaluate the physical characteristics of the vermicompost and the quality of the purine of the red Californian (Eisenia foetida) using different substrates of feed for these worms. For this purpose, nine treatments were studied: 75% African palm rachis + 25% cattle manure, 50% African palm rachis + 50% cattle manure, 25% African palm rachis + 75% livestock manure, 50% manure of cattle, 50% of manure of cattle, 25% of manure of cattle, 50% of manure of cattle, 50% of manure of cattle, 50% of rach of coconut + 50% of manure of Livestock, 25% coccus rachis + 75% livestock manure. The substrate made up of 50% of rachis of coconut and 50% of livestock manure can be used in nurseries or nurseries for being the one that registered a value of pH 7.3 plus the closest to the neutral compared to the others, besides this (75% of oil palm rachis and 25% of cattle manure) showed a higher content of humic and fulvic acids (0.87 and 0.45 p / p, respectively), compounds that are important for agriculture by stimulating plant growth, in addition to this reflection 0.06% sulfur content, 4.0 ppm boron, 7.0 ppm copper, 47.5 ppm iron, 6.0 ppm manganese, with a presence of microorganisms of the species Trichoderma, Penicillium, Cladosporium sp. in amounts of 1.91x105 UFC / ml, however in this substrate was obtained between 13.3 and 43.5% less liquid slurry in Comparison with other treatments.

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