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Assessment of Growth and Mortality Parameters of Common Kilka (Clupeonella cultriventris) in the Southern Caspian Sea Fishing Grounds, Gilan Province
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Kambiz Khedmati   , Mohammad Gholizadeh * , Hassan Fazli , Hadi Raeisi |
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Abstract: (62 Views) |
| This research was conducted to estimate the growth and mortality dynamics of the common kilka (Clupeonella cultriventris) within its primary fishing grounds in the southern Caspian Sea, specifically in the Gilan Province, over the period from October 2022 to October 2024. A total of 688 specimens, comprising 250 males and 438 females, were subjected to biometric measurements and weight analysis. The mean total lengths of males, females, and the overall population were determined to be 12.79 ± 0.21 cm, 11.47 ± 0.12 cm, and 13.34 ± 0.15 cm, respectively. Statistical analysis of length-frequency distributions between sexes indicated a significant difference (DKS = 5.43, N = 152, p < 0.05).By employing the least squares method for model fitting, the asymptotic length (L∞) and annual growth coefficient (K) were estimated for the entire population, males, and females. For the population, these values were 15.85 cm and 0.48 yr⁻¹, respectively. For females, L∞ and K were calculated as 16.47 cm and 0.45 yr⁻¹, while for males, they were 13.95 cm and 0.62 yr⁻¹. The asymptotic weights (W∞) for females, males, and the overall population were 28.38 g, 16.58 g, and 24.42 g, respectively.Total mortality rates (Z) were also evaluated, with estimates of 1.76 yr⁻¹ for males, 1.33 yr⁻¹ for females, and 1.57 yr⁻¹ for the population in Gilan’s coastal waters. The marked reduction in the stock of common kilka highlights an urgent need for the implementation of robust fisheries management strategies to ensure the sustainability of this vital species in the southern Caspian ecosystem. |
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| Keywords: Clupeonella cultriventris, Caspian Sea, infinite length, growth factor |
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Full-Text [PDF 1428 kb]
(14 Downloads)
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Type of Study: Research |
Subject:
Special
Received: 2025/01/20 | Accepted: 2025/02/4 | Published: 2025/06/27
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