Cookies Policy

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.
The full text of this article is not currently available.

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 BrillOnline platform automatically have access to the MyBook option for the title(s) acquired by the Library. Brill MyBook is a print-on-demand paperback copy which is sold at a favorably uniform low price.

Access this article

+ Tax (if applicable)
Add to Favorites
You must be logged in to use this functionality

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.

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


Full text loading...


Data & Media loading...

Article metrics loading...



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
    Your details
    Why are you recommending this title?
    Select reason:
    Crustaceana — Recommend this title to your library
  • Export citations
  • Key

  • Full access
  • Open Access
  • Partial/No accessInformation