Cookies Policy
X

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies.

I accept this policy

Find out more here

Length-based estimates of growth parameters, mortality rates, and recruitment of Astacus leptodactylus (Eschscholtz, 1823) (Decapoda, Astacidae) in unexploited inland waters of the northern Marmara region, European Turkey

No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
Brill’s MyBook program is exclusively available on BrillOnline Books and Journals. Students and scholars affiliated with an institution that has purchased a Brill E-Book on the Brill platform automatically have access to the MyBook option for the title(s) acquired by the Library. MyBook is a cheap paperback edition of the original book and will be sold at uniform, low price.

Access this article

+ Tax (if applicable)
Add to Favorites

image of Crustaceana

The growth parameters, mortality rates, and recruitment pattern of Astacus leptodactylus from an unexploited area in inland waters of the northern Marmara region were investigated based on lengthfrequency data using FISAT software. Specimens were collected during eight scientific samplings carried out between March 2005 and May 2006. The seasonalized Von Bertalanffy growth function was fitted to the length frequency data (n = 2434) with the following parameters: L = 80.8 mm, K = 0.405 year−1, C = 1, and WP = 0.90. The study of functional regressions permits us to conclude that the growth of this population is allometric. Natural mortality (M) was estimated at 0.578 year−1 and total mortality at 0.589 year. The longevity of the crayfish was calculated as t max = 7.4 year. The recruitment pattern shows that there is peak recruitment in May and June.

We also estimated the potential instantaneous fishing mortality coefficient at F = 1.53-1.63 year−1, the instantaneous total mortality coefficient at Z = 2.11-2.21 year−1, and the exploitation rate E = 0.72-0.73, all through the length-converted catch curve procedure using the length-frequency data of the fyke-nets of 32 mm polyamide (PA) mesh size (stretched mesh). Les paramètres de croissance, les taux de mortalité et le modèle de recrutement d'Astacus leptodactylus d'une zone non-exploitée des eaux intérieures du nord de la région de Marmara ont été étudiés à partir des données longueur-fréquence en utilisant le logiciel FISAT. Les spécimens ont été collectés au cours de huit campagnes scientifiques d'échantillonnage menées entre mars 2005 et mai 2006. La fonction de croissance de Von Bertalanffy s'ajuste aux données de longueur-fréquence (n = 2434) avec les paramètres suivants: L = 80,8 mm, K = 0,405 an−1, C = 1, et WP = 0,90. L'étude des régressions fonctionnelles nous permet de conclure que la croissance de cette population est allométrique. La mortalité naturelle (M) a été estimée à 0,578 an−1 et la mortalité totale à 0,589 an−1. La longévité de l'écrevisse a été calculée comme t max = 7,4 ans. Le modèle de recrutement montre un pic de recrutement en mai et juin.

Nous avons aussi estimé le taux potentiel instantané de mortalité par pêche à F = 1,53-1,63 an−1, le taux instantané de mortalité totale à Z = 2,11-2,21 an−1, et le taux d'exploitation à E = 0,72-0,73, par la technique de courbes de prises converties en longueur en utilisant les données longueur-fréquence à partir des verveux de vide de maille polyamide (PA) de 32 mm.

http://brill.metastore.ingenta.com/content/journals/10.1163/156854007781360649
Loading

Article metrics loading...

/content/journals/10.1163/156854007781360649
2007-06-01
2016-02-06

Affiliations: 1: Faculty of Fisheries, Istanbul University, TR-34470 Laleli-Istanbul, Turkey; Faculty of Fisheries, Akdeniz University, TR-07058 Antalya, Turkey; 2: Faculty of Fisheries, Istanbul University, TR-34470 Laleli-Istanbul, Turkey; 3: Faculty of Fisheries, Ege University, TR-35100 Bornova-Izmir, Turkey

Sign-in

Can't access your account?
  • Tools

  • Add to Favorites
  • Printable version
  • Email this page
  • Subscribe to ToC alert
  • Get permissions
  • Recommend to your library

    You must fill out fields marked with: *

    Librarian details
    Name:*
    Email:*
    Your details
    Name:*
    Email:*
    Department:*
    Why are you recommending this title?
    Select reason:
     
     
     
     
    Other:
     
    Crustaceana — Recommend this title to your library

    Thank you

    Your recommendation has been sent to your librarian.

  • Export citations
  • Key

  • Full access
  • Open Access
  • Partial/No accessInformation