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Seasonal changes in the population structure of the Chinese mitten crab, Eriocheir sinensis (H. Milne Edwards) in the Odra/Oder estuary

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A total of 1642 individuals of the Chinese mitten crab, Eriocheir sinensis caught in 2001-2002 in the Odra estuary, were measured. The carapace width was found to range from 46.68 to 92.31 mm (mean width 66.61 ± 7.33 mm); the mean carapace widths of females and males were 65.40 ± 6.82 mm (46.68-88.85 mm) and 67.96 ± 7.66 mm (47.04-92.31 mm), respectively. There were distinct differences in the numbers of individuals caught in different months. The highest number of crabs (85.44% of all individuals) was caught in autumn, as a consequence of reproductive migration. In the total number of 1642 specimens examined, males were slightly dominant (51.4%), in particular in October (55.31%) and November (52.01%). Females dominated in spring and summer and contributed 57.2-64.7%. Un total de 1642 individus du crabe chinois Eriocheir sinensis capturés en 2001-2002 dans l'estuaire de l'Odra ont été mesurés. La largeur de la carapace était comprise entre 46,68 et 92,31 mm (largeur moyenne 66,61 ± 7,33 mm); la largeur moyenne de la carapace des femelles et des mâles était de 65,40 ± 6,82 mm (46,68-88,85 mm) et 67,96 ± 7,66 mm (47,04-92,31 mm), respectivement. Des différences notables ont été observées dans les nombres d'individus capturés suivant le mois. Le nombre le plus élevé de crabes (85,44% de tous les individus) a été récolté en automne, suite à la migration de reproduction. Sur le nombre total des 1642 spécimens examinés, les mâles étaient légèrement dominants (51,4%), en particulier en octobre (55,31%) et novembre (52,01%). Les femelles dominaient au printemps et en été, dans la proportion de 57,2-64,7%.


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