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Restoration of the European sturgeon, Acipenser sturio L., 1758 in Germany: Effect of Different Feed Items on Specific Growth Rates of Large Juvenile Fish
Author(s) -
Hensel Emanuel C. K.,
Kirschbaum Frank,
Williot Patrick,
Wirth Manfred,
Gessner Jörn
Publication year - 2002
Publication title -
international review of hydrobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.524
H-Index - 52
eISSN - 1522-2632
pISSN - 1434-2944
DOI - 10.1002/1522-2632(200211)87:5/6<539::aid-iroh539>3.0.co;2-c
Subject(s) - zoology , biology , limiting , population , fishery , fish <actinopterygii> , mechanical engineering , demography , sociology , engineering
23 Acipenser sturio juveniles (51 months old, median total length 80 cm, median weight 1950g) of a 1995 artificially reproduced F1 population from the Cemagref, Bordeaux were used for feeding experiments for 28 weeks. Fish were kept in two experimental tanks (5.5 m 3 ) at 20.5 °C and natural photoperiod in freshwater. During the first 16 weeks fish were fed three frozen components (3C), small marine fish (FSMF), small chironomids (FSC) and large chironomids (FLC) except for 3 two weeks periods when the 3 single components were tested: the highest median specific growth rates (MSGR) were obtained with the FLC feed (0.43% bw/d). From weeks 17 to 28 FLC feed was offered except for 2 two weeks periods: a feeding experiment was performed with FLC plus frozen pieces of smelt (MSGR –0.18% bw/d) and a starvation experiment (MSGR –0.32% bw/d). A. sturio showed a high variation in both the MSGR and the individual SGR values thus limiting the interpretation of these quantitative results.