Growth of sterlet Acipenser ruthenus under experimental and farm conditions of the Czech Republic, with remarks on other sturgeons
2011
Prokes, M., Akademie Ved, Brno (Czech Republic). Ustav Biologie Obratlovcu | Barus, V., Akademie Ved, Brno (Czech Republic). Ustav Biologie Obratlovcu | Mares, J., Mendelova Univ., Brno (Czech Republic). Ustav Zoologie, Rybarstvi, Hydrobiologie a Vcelarstvi | Penaz, M., Akademie Ved, Brno (Czech Republic). Ustav Biologie Obratlovcu | Baranek, V., Povodi Moravy, Brno (Czech Republic)
Growth rate of Acipenser ruthenus juveniles and adults was studied and compared with other sturgeon species under experimental and farm conditions in the Czech Republic. During the juvenile development (0+ to 5+) the specific growth rate (SGR) decreased successively from 17.67 to 0.05 %/d. During the adult period of development (6+ to 13+), the SGR fluctuated from 0.0191 to 0.0562, mean = 0.0410 %/d. In addition, body weight condition and length-weight relationship are presented. The adult period commenced at average age from 4 to 5 years. At the end of subsequent 13 years of life (1st-13th), following values of TL/w (in mm/g) in reared sterlet were determined: 250/53, 350/174, 400/250, 440/320, 465/400, 490/462, 516/525, 546/645, 561/720, 596/860, 610/1014, 625/1199, 660/1456. A very fast growth intensity was determined in the young sterlet (1st and 2nd year) while it decreased in the older fish. Growth intensities of other reared sturgeon species (Huso huso, Polyodon spathula, A. gueldenstaedtii, A baerii, A. stellatus) were mainly higher than that of sterlet in early juvenile period of ontogeny.
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