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Spatial distribution of fish in reservoirs and lakes
MUŠKA, Milan
This thesis is focused on the fish spatial distribution and its changes mainly during the diel cycle. In the first part, I described the fish spatial distribution in the tropical lake ecosystem of Lake Turkana. The second part deals with the fish spatial distribution in a temperate reservoir on the different spatial scales from in/offshore habitats over the fine-scale to the level of individuals. The linkage of fish distribution patterns with selected environmental variables was also evaluated.
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Fish avoidance behaviour in response to a trawl gear
SAJDLOVÁ, Zuzana
The main objective of the thesis is an introduction to the problematics of fish avoidance behavior in response to a trawl gear towed by one or two trawlers (motor boats). Avoidance or escape reactions are dependent on many factors and ecological conditions influencing animals´ behaviour therefore it is necessary to refer about fish sensory organs and perception. The content also deals with methods useful for studying fish behaviour in the wild. These are invasive and noninvasive technics and methods like acoustics, video cameras and towed gears (mainly trawls). All of them have become an important tool in recent surveys of marine environment as well as freshwater lakes and reservoires.
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