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Following two previous workshops (Hluboká nad Vltavou, Czech Republic, 1994; Badajoz, Spain, 1997), the Leibniz‐Institute of Freshwater Ecology and Inland Fisheries in Berlin in close cooperation with the Fisheries Department of the Saxonian State Institute of Agriculture, Königswartha, organized a third workshop whereby European experts were invited to meet in Machern, Germany, from 11‐15 September 2000. Thirty‐three participants from eight countries (Belorussia, Bulgaria, Czech Republic, Estonia, Germany, Italy, Poland, and Spain) accepted this invitation and came to Saxony, a region in Germany with a long and rich tradition in conventional pond fish farming. The Workshop was organized in six sessions covering the following subject areas: 1) Genetics, Cytology and Breeding (Chair: Klaus Kohlmann) 2) Gametogenesis, Reproduction and Early Development (Chair: Ewa Kamler) 3) General Ecology (Chair: Zdenk Adámek) 4) Physiology (Chair: Martin Flajšhans) 5) Rearing and Weaning of Juveniles (Chair: Gert Füllner) 6) Culturing to Market Size and Product Quality (Chair: Juan José Pérez‐Regadera Pérez) A Poster Session was moderated by Otomar Linhart (Czech Republic). In total, 20 oral contributions and 10 posters were presented. This volume includes the most relevant manuscripts selected after peer review. Several topics are of immediate and practical importance to tench culture. Knowledge on population genetics of the species is fundamental for future broodstock management, to avoid inbreeding and establish appropriate gene banks. Insight has been gained to identify the effective population size to minimize detrimental genetic effects in controlled reproduction programmes. A performance test with five genetically different strains revealed significant growth differences, demonstrating that the choice of a proper population can remarkably enhance productivity. Studies on oogenesis and artificial reproduction (induction of ovulation by synthetic hormones, desticking methods for better fertilization, and incubation by an alcalytic enzyme), are among the relevant results for effective and reliable fry production. Investigations on the environmental requirements of various lifecycle stages (e.g. temperature, light, substrate and pH) are not only prerequisites for the optimal raising of all developmental stages up to marketable size but are also essential for broodstock quality control. The farming sessions considered important subjects such as optimum feeding rhythms, adequate feed composition, food competition in pond culture, and also resulted in technological recommendations for production to marketable size and product characteristics. For the first time, product quality was examined in tench culture, indicating a clear advantage of an F1 hybrid over a pure strain for most of the factors studied. Financial support from the Deutsche Forschungsge mein schaft, the Saxonian State Ministry of Environment and Agriculture, and the Leibniz‐Institute of Freshwater Ecology and Inland Fisheries is also gratefully acknowledged; without their support the Workshop would not have been possible. The organizers and Special Issue Editors wish to thank all Session Chairs and the many anonymous referees for their tremendous assistance in improving the presentation of the manuscripts. Special thanks are also due to the management and staff of the institutions involved, as well as the Congress Hotel and the Kavalierhaus Machern for providing the perfect technical and social environment to make the Workshop a successful and pleasant event. During the final session, the plenary discussion considered a proposal from Polish participants to hold the next Tench Biology Workshop in Poland in 2004. This offer was unanimously accepted by the participants, and the Polish colleagues are now in charge of the timely preparation.
Journal of Applied Ichthyology – Wiley
Published: Jun 1, 2003
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