Volume 14, Issue 4 (winter 2025)
J. Aqua. Eco 2025, 14(4): 1-11 |
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Danaei A, Patimar R, Raeisi H, kordjazi Z, Fazel A. Spatio-temporal Variability of Some Population Dynamics Parameters of the Caspian kutum, Rutilus frisii (Nordmann, 1840) in the Coastal Waters of Golestan Province (Southeast Caspian Sea). J. Aqua. Eco 2025; 14 (4) :1-11
URL: http://jae.hormozgan.ac.ir/article-1-1130-en.html
URL: http://jae.hormozgan.ac.ir/article-1-1130-en.html
Abstract: (290 Views)
This study aimed to investigate inter-population variation in the population dynamics of the Caspian kutum (Rutilus frisii) based on catch data from the coastal waters of Golestan Province (southeast Caspian Sea) over 26 years (1991-2016). The biometric data of 20,438 kutum samples were analyzed, with sizes ranging from 18 to 70 cm. The average values of L∞ and k were 59.83 cm and 0.44 per year, respectively. The weight infinity (W∞) ranged from 1,738.97 to 6,380.03 grams, with an average of 2,867.96 grams. Cohort analysis revealed five distinct cohorts in the exploited population. The natural mortality rates varied between 0.60 and 0.84, with an average total mortality (Z) of 1.35. The exploitation rate (E) ranged from 0.13 to 0.73, exceeding 0.5 in 8 years. The results indicate significant temporal variability in the kutum population over the study period.
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This work is licensed under a Creative Commons — Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)