Estimating age structure of Liocarcinus depurator along the western Black Sea coast of Türkiye using the Bhattacharya method

Authors : Ahmet Mutlu Gözler, Aziz Gümüşler, Erhan Çiloğlu

Pages : 825-831

Doi:10.35229/jaes.1773741

View : 118 | Download : 224

Publication Date : 2025-11-30

Article Type : Research Paper

Abstract :A total of 2.233 Liocarcinus depurator samples were collected during beam trawl surveys along the northwestern Black Sea coast of Türkiye to analyse the population\\\'s age structure. The male-to-female ratio is 2:1. Length-frequency distributions were estimated for four age groups using the Bhattacharya method, with carapace lengths of 0+ = 15.51 mm, I+ = 23.76 mm, II+ = 31.29 mm, and III+ = 36.49 mm for males, and 0+ = 15.35 mm, I+ = 21.36 mm, II+ = 27.18 mm, and III+ = 30.50 mm for females. For all sexes combined, lengths were 0+ = 15.35 mm, I+ = 22.65 mm, II+ = 30.81 mm, and III+ = 36.59 mm. One-way ANOVA showed significant differences in mean length among age groups for the pooled sample, as well as for males and females separately (all p < 0.001). Independent t-tests found no significant difference between sexes in age group 0 (p = 0.59), but significant differences in age groups I, II, and III (p < 0.05 for all). Males were generally larger than females in older age groups, indicating apparent sexual dimorphism and different growth patterns in the population.
Keywords : Yaş yapısı, Bhattacharya metodu, Liocarcinus depurator, Eşeysel dimorfizm, Türkiye Karadeniz kıyıları

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