Age and Growth of Rudd, Scardinius erythophthalmus (Linnaeus, 1758), in Ömerli Reservoir (İstanbul, Turkey)

Abstract

In this study, 317 rudds (Scardinius erythrophthalmus (Linnaeus, 1758) were captured between March 2005 - January 2007 from Ömerli Reservoir and growth features such as age, growth and condition factor were investigated. The age composition of rudd population varied between -0-8 years. Maximum number of rudds were 2 years of age. Females, males, and juvenile composition of the population was 54.26%, 43.22%, and 2.2%, respectively. The total length and weight of rudds varied between 6.8-29.0 cm and 3.4-392.7 g respectively. The von Bertalanffy growth equations were L(t) = 34.63[1-e−0.170 (t+1.327)], W(t) = 574.31[1-e−0.170 (t+1.327)]3.15 ± 0.029 for males, L(t) = 37.43[1-e−0.153 (t+1.371)], W(t) = 847.58[1-e−0.153 (t+1.371)]3.28 ± 0.024 for females and L(t) = 37.55[1-e−0.153 (t+1.389)], W(t) = 819.23[1-e−0.153 (t+1.389)]3.2 4±0.017 for all specimens in the Ömerli Reservoir. Length-weight relationship was calculated as W = 0.0066TL3.24±0.017 for all individuals. According to age groups, condition factor varied between 1.121-1.678 for females and 1.172-1.724 for males, respectively.

Keywords

• Age
• growth performance
• condition factor
• rudd

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