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Porovnání araneofauny dutin ovocných dřevin v okolí liniových staveb v Brně - Obřany a Rohozná
Boučková, Monika
The aim of my bachelor thesis was to determine the number of spiders in the cavities of fruit alley trees around the line structures (path, roads). I chose two localities, one made of fruit and the other leafy trees, which I then compare. I caught the spiders in the news traps during the 2014/2015 period every month. I found a total of 163 spiders, of which only 5 were adult. I found these adults in the summer months in a different kind of representation. The most numerous of them is the family Salticidae represented by 2 pieces. Juvenile individuals were the most represented by the families of Philodromidae. These species I discovered 61 predominantly on Malus domestica. Keywords: spiders, trees, cavities, line structures, adult, juvenile
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Araneofauna dutin ovocných dřevin v okolí obce Želetice
Bělohoubek, Jiří
The main target of my bachelor thesis was to measuring the frequency of spiders in the cavities of fruit trees around the village Želetice, their species composition and compare the results by different kinds of fruit trees in the study area. Spiders've fielded in card-board or newspaper traps for a year, always at monthly intervals and a total of 83 I found spiders, of which 9 were adult. For juveniles, the most represented family Phi-lodromidae and most frequent representative adults is Lepthyphantes leprosus. The most abundant month was November 2015, and most individuals was found on Malus domestica namely 48.8% of all spiders.
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Length and weight growth of early pikeperch fry fed with enriched artemia nauplii in experimental conditions
JANKOVÝCH, Antonín
The aim of our experiment was proving the suitability and effectivity of artemia nauplii enrichment in pikeperch fry rearing. 24 hour enrichment took place in 3 variants: 1. SELCO, 2. 18 (n-3) (alfa-linolenic acid) and 3. 18 (n-3) + vitamin C. Original intention was initializing fry feeding with different types of enriched artemia metanauplii. Due to excessive size of artemia after 1 day enrichment (Artemia franciscana) (in comparison with size of fry oral cavity) the intake of such food was not possible, thus the metodics had to be modified. From the given reason, fish were initially fed with unenriched nauplii ; firstly with dose 100 ml (4 - 8 day post hatch - dph) after that with dose 50 ml per tank (9. dph 25.4.). As soon as fry reached suitable size and was able to intake bigger size of nauplii, was in the second part feeding diferenciated (use of different types of enrichment and control group was fed with unenriched artemia). First part of experiment lasted 22 days (5.4. - 26.4.), fish must have been netted and again placed in tanks for experiment with enriched artemia. Second part of rearing varied in use of differently enriched metanauplii and lasted 8 days (27.4. - 4.5.). At the end of second part of feeding (from 1.5.) was involved co-feeding, which means combined feeding (living food and starter feed). 5.5. was experiment terminated. The highest survival was reached in group fed with artemia enriched in comercial preparate SELCO (28,67 %), second highest survival was reached in group fed metanauplii enriched in alfa-linolenic acid (27,88 %) and third highest survival was reached in group fed with alfa-linolenic acid and vitamin C enriched metanauplii (19,00 %). The highest individual fry weight at the end of experiment was reached in group fed with artemia enriched in alfa-linolenic acid and vitamin C : 306,16 +- 64,27 mg, the lowest individual weight was reached in control group : 216,9 +- 39,96 mg. The highest average total lenght (l.t.) was measured in SELCO group 30,13 +- 2,47 mm, the lowest total lenght reached fish in control group 27,37 +- 1,32 mm. In group fed with artemia enriched in vitamin C was noticed the highest percentage of starter feed intake (8 %), but simultaneously in the same group was reached the highest rate of cannibalism (6 %).
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Comparison of growth and diet of juvenile perch (Perca fluviatilis) and pikeperch (Sander lucioperca) in ponds
SVATEK, Petr
Perch (Perca fluviatilis) and pikeperch (Sander lucioperca) are currently identified as suitable species for intensive aquaculture. Intensive pond farming in Central Europe (Czech Republic, Poland, Hungary and Austria) where these two species is used primarily for breeding and production of larval and juvenile stages, which then adapt to the conditions of controlled recirculation systems or used to produce blends for free water. The goal of my work will make the successful rearing of larvae of pikeperch and perch in a monoculture in pond conditions.
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Toxicity of selected substances for spiny-cheek crayfish
MAHOVSKÁ, Ivana
The thesis examined the toxicity of selected compounds for spiny-cheek crayfish (Orconectes limosus) in laboratory conditions. Tested the acute toxicity of the insecticide Diazinon 60 EC and herbicide Roundup Biaktiv. Tests were chosen to juveniles spiny-cheek crayfish (Orconectes limosus), and juvenile and adult specimens of signal crayfish (Pacifastacus leniusculus).These species of crayfish have been selected as an easily accessible model organism. Both species of crayfish spreading and in Europe they are unoriginal. Work focused on the observed toxicity of these substances on spiny-cheek crayfish and signal crayfish and the demands on the quality of the environment.
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