Growth and reproductive characteristics of Squalius Lepidus Heckel 1843 in the Dimeh spring of Zayandeh-Rud River

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Abstract

Population structure, growth, and reproductive characteristics of Kavar, Squalius lepidus, a
native species of Cyprinidae family in Zayandeh-Rud River were investigated by monthly
sampling from October 2006 to August 2007. A total of 415 individuals were collected. Age
groups of males and females ranged between 1+ and 4+. The male:female sex ratio was 1:3.
The largest female was 163.0mm in fork length and 63.71g in weight whereas the largest
male was 156.0mm in fork length and 50.45g in weight. The minimum, maximum, and mean
absolute fecundity was 1161, 12953, and 4279±2169, respectively, and relative fecundity was
148.4±49.3 eggs/g of body weight. Gonadostomatic Index (GSI) values suggested that
spawning of Squalius lepidus occurs from May to June. Thus, Squalius lepidus is considered
an intermittent spawner species. Growth parameters for both sexes were stated by the von
Bertalanffy growth function as k = 0.162, L = 232mm, to= -0.427 years for females and k =
0.136, L =217mm, to =- 0.847 years for males. The weight-length relationship was described
as W = 0.00005L2.827 (r2 = 0.860) for males andW = 0.00005 L 2.855 (r2 = 0.859) for females.
The slope of the regression line (b) fitted through the weight-length data suggested a negative
allometric growth for both females and male (P

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Iranian Scientific Fisheries Journal
Volume 20, Issue 2
March and April 2011
Pages 121-130

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