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Intensive rearing of two-year-old stock of grayling, Thymallus thymallus L Intenzivni odchov dvoulete nasady lipana podhorniho Thymallus thymallus L



Intensive rearing of two-year-old stock of grayling, Thymallus thymallus L Intenzivni odchov dvoulete nasady lipana podhorniho Thymallus thymallus L



Bulletin VURH Vodnany. leden-brezen; 411: 3-11



Populations of grayling in running waters of the Czech Republic decrease permanently. Users of fishing grounds therefore pay sustainable attention to production of stocking material of this fish and to its restocking. Local organization of Czech Anglers" Union in Cesky Krumlov reared two-year-old stockfish in a flow-through pond ( 450 m2) with regular administration of a supplemental feeding mixture in 2004. The stock comprised of 4 000 yearlings of grayling (G1). After five months of rearing, altogether 2 500 stockfish of grayling (G2) were harvested with 197 mm mean size and 75 g mean body weight. Exterior and condition parameters and indices of G2 were checked at the harvest, as well as dressing percentage and proportions of individual body parts; these were compared with literature data. Our results from the intensive culture were comparable to, or in some cases (indices) more favourable than those on grayling from other recipients. Most females at the age of 17 months were found with gonadosomatic index about 2.4 %. Part of the stockfish reared was group-marked and restocked into open waters.

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