A study on the morphometric characteristics of Astacus leptodactylus inhabiting the Thrace region of Turkey

This study was carried out to determine some morphological characteristics, and the length-length and length-weight relationships of freshwater crayfish (A. leptodactylus Eschscholtz 1823) in the area of Tekirdağ, in the Thrace region of Turkey. The total length and wet weight for all individuals ra...

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Bibliographic Details
Published in:	Knowledge and management of aquatic ecosystems no. 397; pp. 5 - 13
Main Authors:	Deniz (Bök), T., Harlıoğlu, M.M., Deval, M.C.
Format:	Journal Article
Language:	English
Published:	EDP Sciences 01-01-2010
Subjects:	allometric growth Astacidae Astacus leptodactylus caractères morphométriques crayfish croissance allométrique Freshwater length-weight relationship morphometric characters relations longueur-poids région Thrace Thrace region écrevisse Turkey
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Summary:	This study was carried out to determine some morphological characteristics, and the length-length and length-weight relationships of freshwater crayfish (A. leptodactylus Eschscholtz 1823) in the area of Tekirdağ, in the Thrace region of Turkey. The total length and wet weight for all individuals ranged from 33 to 156 mm and 0.64 to 96.42 g, respectively. Although the average length of both sexes was nearly the same, the average weight of male crayfish was higher than that of females. The total length-wet weight relationships for males, females and combined sexes of wet weight were found to be: WW = 7.106TL3.293, WW = 2.105TL3.022 and WW = 9.106TL3.224, respectively. Isometric growth for female crayfish and positive allometric growth for male crayfish were observed in all populations. The carapace length, carapace width, and chela length and width increased allometrically with total length (TL) in both sexes. In conclusion, the morphometric relations in A. leptodactylus observed in the present study could provide information for future studies and management plans. Cette étude a été conduite pour déterminer quelques caractéristiques morphologiques, les relations longueur-longueur et longueur-poids de l’écrevisse d’eau douce (A. leptodactylus Eschscholtz 1823) dans la zone de Tekirdağ, dans la région Thrace de Turquie. Les longueurs totales et les poids frais de tous les individus vont de 33 à 156 mm et de 0,64 à 96,42 g respectivement. Bien que les longueurs moyennes des deux sexes soient très proches, le poids moyen des écrevisses mâles est supérieur à celui des femelles. La relation longueur totale (LT)-poids frais pour les mâles, femelles et sexes combinés, sont : WW = 7,106TL3,293, WW = 2,105TL3,022 et WW = 9,106TL3,224 respectivement. Une croissance isométrique pour les écrevisses femelles et allométrique positive pour les mâles a été observée dans toutes les populations. Les longueurs et largeurs de carapace et de pince croissent allométriquement avec la longueur totale dans les deux sexes. En conclusion, les relations morphométriques observées chez A. leptodactylus dans cette étude peuvent apporter des informations pour des études ultérieures et les plans de gestion.
Bibliography:	publisher-ID:kmae100011 ark:/67375/80W-JJH55XX8-N tomrisdeniz@hotmail.com istex:F2D61FBDB07CC3512BF963AA2628E3740DB30589 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1961-9502 1961-9502
DOI:	10.1051/kmae/2010021