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National Repository of Grey Literature 1 records found  Search took 0.00 seconds. 
The artificial stripping and semi-intensive breeding of the grayling (Thymallus thymallus L.)
 VÝBOŠŤOK, Michal
The aim of the experiment was to verify the possibility of semi-intensive production of three month old European grayling (Thymallus thymallus) stocks for stocking into open waters. The grayling fry was stocked in small ponds in FROV JU experimental fish culture facility and trout farm Kaplice after the first feeding in shallow troughs. In ponds, the fry was fed by naturally occurring zooplankton with dry food addition. The highest level of survival was 32 %. Fish captured after 9 weeks of rearing in the pond (to 12.7.) were a mean weight of 2.7 g and mean total length of 70 mm. Preserving of hygiene, implementation of preventive therapeutic interventions and ensuring an adequate level of nutrition during firs feeding in the trough are the key factors of this method. The second requirement is thorough preparation and treatment of ponds used for rearing. The experiment also showed a wide tolerance of grayling fry to the physico-chemical parameters of water during the first year of life.
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