Electrophoretic identity between allis shad, Alosa alosa (L.), and twaite shad, A.fallax (Lacépède) |
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Authors: | P. Boisneau,C. Mennesson-Boisneau, R. Guyomard,&dagger &Dagger |
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Affiliation: | Laboratoire d'Ecologie Hydrobiologique, I.N.R.A., 65, rue de St-Brieuc, 35042 Rennes, France;Laboratoire de Génétique des Poissons, I.N.R.A., Domains de Vilvert, 78350 Jouy-en-Josas, France |
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Abstract: | Morphological characteristics as well as electrophoretic polymorphism have been analysed in eight samples of allis shad, Alosa alosa (L.) and twaite shad, Alosa fallax (Lacepede), collected in the Loire basin and the Gironde-Dordogne system. The morphological characteristics showed that allis and twaite shad were present in these samples. Moreover, specimens with intermediate characteristics were found in the Loire and assumed to be hybrids between the two forms. By contrast, the two species were monomorphic and electrophoretically indistingishable at the 22 loci analysed. Therefore, it cannot be excluded that these two forms correspond to a single species. |
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Keywords: | Alosa alosa A. fallax enzyme polymorphism |
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