Journal of Wetland Ecobiology
Volume 16, Issue 1 (Spring 2024)
2024, 16(1): 22-29 |
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Hakimimofrad R, Behbash R. Growth Pattern and Length–Weight Relationships of Redbelly Tilapia (Coptodon zillii) in Shadegan Wetland Using OLS and RMA Regression Models. Wetland Ecobiology 2024; 16 (1) : 3
URL: http://jweb.ahvaz.iau.ir/article-1-1115-en.html
URL: http://jweb.ahvaz.iau.ir/article-1-1115-en.html
Abstract: (271 Views)
Shadegan Wetland, the largest wetland in Iran and a key aquatic ecosystem in the Middle East, has been significantly impacted by the invasive redbelly tilapia (Coptodon zillii). Understanding the growth dynamics of this species is essential for effective management and ecological impact assessment. This study aimed to investigate the length–weight relationship and allometric growth of C. zillii in Shadegan Wetland, comparing estimates derived from Ordinary Least Squares (OLS) and Reduced Major Axis (RMA) regression methods. In spring 2016, 30 individuals were sampled, and their total length (TL), standard length (SL), and body weight were recorded. The length–weight relationship was estimated using log-transformed linear regression equations. Strong linear correlations were observed between length and weight. Model fitting based on total length (r² = 0.968) exhibited a stronger fit than that based on standard length (r² = 0.886). For all regressions, the estimated growth coefficient (b) was less than 3, indicating negative allometric growth, where weight increases disproportionately less than length. The RMA method consistently yielded higher b values than OLS and is generally considered more appropriate for biological studies due to its accounting for error in both variables. The condition factor (K) was calculated as 2.13 and exhibited a significant decreasing trend with increasing TL, consistent with the observed negative allometric growth. Overall, these results suggest successful establishment and favorable conditions for C. zillii in Shadegan Wetland. Therefore, regular monitoring of growth dynamics and condition factors is recommended for effective management and conservation of this valuable aquatic ecosystem.
Article number: 3
Keywords: Redbelly tilapia, Shadegan Wetland, Length-weight relationship, Growth pattern, Regression methods
Type of Study: Research |
Subject:
Special
Received: 2025/12/24 | Accepted: 2026/01/8 | Published: 2026/01/8
Received: 2025/12/24 | Accepted: 2026/01/8 | Published: 2026/01/8
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