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Ichthyologic monitoring the flow of Popelka in Nová Ves nad Popelkou
ZELENKA, Václav
The aim of this work is to evaluate ichtyofauna in the stream Popelka, to determine the species composition of fish stoce and to determine the dominant fish species, their abundance and size variability. Throughout the length of the flow, twelve catching sites were identified there, the length of each site was about 50 m, the catch in these sites was from the bottom of the upstream towards the end. The catch of the flow was by wade manner with use of an electric aggregate. All caught fish species were subsequently determined. Also the body lenght so-called ?standart lenght? was measured. After measuring all fish that were caught were gently given back to the place of the catch. In terms of abundance the most numerous species in Popelka was brown trout represented by 477 subjects followed by stone loach with 391 subjects. These species clearly dominated in Popelka. Another occurring species were rainbow trout with 49 subjects, brook charr with two subjects and hybrid of brown trout and brook charr with one subject. With regard to the regional constance the brown trout was a species almost always present, with presence in 11 out of the 12 sites. Stone loach with incidence in 8 locations was mainly occurring species. With the appearance in 5 localities the rainbow trout was frequently occurring species. Among the species that are rare in Popelka, there were brook charr occurring in two locations and hybrid of brown trout and brook charr with the appearance in one location. Index of species diversity by Shannon and Wiener for the flow of Popelka is 0.88 and evenness is 0.55. Size variability across the flow in body length of brown trout was ranging from 46 to 308 mm, in diameter 126.4 mm, the stone loach from 41 to 130 mm, in diameter 80.1 mm, the rainbow trout from 65 to 250 mm, in diameter 88.7 mm and brook charr from 290 to 313 mm with an average of 301.5 mm. In the Popelka stream with a total length of 12 km there are four species of fish in these fish communities. Species diversity is distinctly poorer in comparison with the other streams. It would be appropriate to repeat the catch in the future to determine the stability of fish population in Popelka stream.
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Ichtyofauna of selected streams of Bohemian Forest
ŠRÁMEK, Jiří
Presented work is directed to summarize the results of ochtyomonitoring of five stream in Bohemian Forest in autumn 2010. The processing status is evaluated fish communities, especially their species composition, diversity, dominance, evenness and other parameters. They have been evaluated also physico-chemical properties of the sites such as air and water temperature, conductivity and turbidity. Last but not least were evaluated the characteristics of flows and in particular morphological characteristics, types of the bottom substrate and its contours etc. The evaluation of all obtained data showed that fish communities surveyed Bohemian flows are balanced, they are not burdened with invasive species and rand indicators correlated with the state of flow, geographic location and natural conditions. It was caught nine fish species in the total number of 963 individuals. Abundance was at all locations in the range 201,6 to 409,7 individuals per kilometer of flow, showed the diversity of communities from 0,372093 to 2,166085 (Shannon and Wiener index) and from 0,301804 to 0,866948 (Simpson index), then evenness of plant 0,372093 to 0,783906. The most dominant species was the brown trout, the second most frequent species was bullhead.
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The Fish Populations in the Selected Sumava Mountains streams with an occurrence of the Freshwater Pearl mussel
LUNDA, Roman
Monitoring of fish populations was done in 2010. The catch was conducted at predetermined locations with a potential occurrence of the freshwater pearl mussel (Margaritifera margaritifera). The aim was to map there ichtyofauna in terms of biodiversity, equitability, abundance, dominance and the size variation. An electric aggregate catching was used for the monitoring. Each section of the monitored area was 200 m long and catching was proceed upstream in its whole width. Caught fish were determined, measured and returned back. The status of fish communities was assessed on the basis of acquired information. In total, two species of Salmonidae and Cottidae were found in the monitored localities and one species of Cyclostomata. The dominating brown trout (Salmo trutta m. fario), (81.4%) was followed by the bullhead (Cottus gobio), (17.4%). The brook lamprey belongs to the next protected and endangered species. In terms of biodiversity the locality no. 8 Spulka ? upper part (0.59) was assessed as the first one while the locality no. 2 Zlaty potok (Golden stream) ? Miletinky (0.14) was at the last placing. A majority of these localities? community was formed only by the brown trout and the bullhead. Only one part of the locality no. 3 Zlaty potok ? Strunkovice had a community enriched by the brook lamprey. The most abundant freshwater pearl mussels were confirmed at the locality no. 2 Zlaty potok ? Miletinky where the freshwater pearl mussel occurs from tens to hundreds individuals. This part has also a high abundance of the brown trout (96.8%) which serves as the host fish for the freshwater pearl mussel?s evolution cycle.
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Fish Population in Tributaries of Tepla Vltava River
GEBAUER, Radek
Monitoring of fish populations in tributaries of Tepla Vltava River was performed in 2010. This survey was held in pre-selected localities. The aim was to detect the status of local ichthyofauna in terms of biodiversity, equitability, abundance, dominance and size variation. The results can be used for comparison with future researches at these localities. To catching fish was used the electrofishing. Each section was 200 m long and the electrofishing crew went upstream in entire width of the flow. Caught fish were determined, measured and carefully returned back to the stream. Based on acquired information was evaluated the status of fish populations. All together we have caught 7 fish species and 1 cyclostomes species ? brook lamprey. In terms of dominance took the first place brook trout (average 79 %) followed by the bullhead (12.9 %). Other protected and endangered species were: brook lamprey, fathead minnow and burbot. In terms of biodiversity was on the first place Olšinka (1.07), lowest biodiversity was on the brooks Jedlový, Houženský and Kubohuťský stream, the value of biodiversity was here 0. Highest equitability was calculated on the middle section of the Kaplický stream (0.95). The worst stream was the Jedlový stream. On 200 m long section of this stream occured only 9 pieces of brook trout.
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