Abstract
Despite widespread use of genetic species discrimination, morphological characteristics provide the only means of species identification in the field. In Atlantic and European sturgeon parameters used for species segregation have been established for subadults and adults. So far, with regard to juvenile stages of A. oxyrinchus currently used for restocking, diagnostic morphological characteristics allowing the distinction between the two species have not been defined. Here, morphometric and meristic characteristics of early juveniles of A. oxyrinchus and A. sturio are presented, and their value for the species determination in fish of 4–20 cm is assessed. We outline valid diagnostic characteristics in juveniles (number of dorsal and lateral scutes, surface/type of scutes, presence of fontanelle), giving comments on their usefulness with regard to the diagnostic significance in adults.
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Acknowledgment
This study was supported in part by a grant from the German Ministry of Education and Science (BMBF 0330718) as part of the project “Genetic population structure, breeding plan and artificial reproduction of the European sturgeon”. We would like to thank Marcel Jansen and Philipp Lachner for their help in the lab.
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Wuertz, S., Reiser, S., Gessner, J., Kirschbaum, F. (2011). Morphological Distinction Between Juvenile Stages of the European Sturgeon Acipenser sturio and the Atlantic Sturgeon Acipenser oxyrinchus . In: Williot, P., Rochard, E., Desse-Berset, N., Kirschbaum, F., Gessner, J. (eds) Biology and Conservation of the European SturgeonAcipenser sturioL. 1758. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-20611-5_4
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