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Suitability of Different Food Types for On-Feeding and Juvenile Production of European Grayling, Thymallus thymallus, under Intensive Farming Conditions

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  • Franz Lahnsteiner
  • Manfred Kletzl

Abstract

In the present study on-feeding and juvenile production of European grayling, Thymallus thymallus, was tested with a commercially available fry food for salmonids (FSS) and a specific self-made fry food containing zooplankton components (DFZO) under intensive farming conditions. Live zooplankton food was used as control. Rearing of grayling was not possible with FSS as in > 70% of the fish malformations manifested circa 30 days after on-feeding. Malformed fish had sharply bent tails and gas accumulations in the coelomic cavity and intestine. These alterations were reversible and compensated when fish were fed on a live zooplankton diet instead of FSS for 2 weeks. When grayling were fed with DFZO during the first 14 days and with FSS thereafter, survival rates 49 d after first feeding were 85 ± 3%, increase in total length was from 15.7 ± 0.9 mm (day of first feeding) to 27.1 ± 1.2 mm (day 49) and in weight from 20 ± 2 mg to 110 ± 13 mg. The percentage of malformed fish was < 0.5%. These viability parameters did not significantly differ from fish fed with live zooplankton food.

Suggested Citation

  • Franz Lahnsteiner & Manfred Kletzl, 2014. "Suitability of Different Food Types for On-Feeding and Juvenile Production of European Grayling, Thymallus thymallus, under Intensive Farming Conditions," Journal of Agricultural Science, Canadian Center of Science and Education, vol. 7(1), pages 161-161, December.
  • Handle: RePEc:ibn:jasjnl:v:7:y:2014:i:1:p:161
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    References listed on IDEAS

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    1. Franz Lahnsteiner & Manfred Kletzl & Thomas Weismann, 2012. "Rearing of Burbot, Lota lota (Pisces, Teleostei), Larvae with Zooplankton and Formulated Microdiets," Journal of Agricultural Science, Canadian Center of Science and Education, vol. 4(9), pages 269-269, July.
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      JEL classification:

      • R00 - Urban, Rural, Regional, Real Estate, and Transportation Economics - - General - - - General
      • Z0 - Other Special Topics - - General

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