Age, growth, sex ratio, spawning season and fecundity of Capoeta razii from Sefidroud River in the southern Caspian Sea basin

Iranian Journal of Ichthyology Pub Date : 2019-01-25 DOI:10.22034/IJI.V5I4.287

Kobra Ghasemzadeh-Sarcheshmeh, H. Mousavi-Sabet, M. Sattari, S. Vatandoust, M. Ahmadnezhad

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引用次数: 1

Abstract

Some aspects of reproductive biology of Capoeta razii , an endemic cyprinid species from the Sefid River in the southern Caspian Sea basin, were studied by monthly sampling throughout a year. Age, growth, sex ratio, spawning season, fecundity, gonado-somatic, modified gonado-somatic and Dobriyal indices were estimated. The sex ratio (F: M) was obtained as 1.00:2.63, and the percentage of males was greater than females. The mature males and females were longer than 88 and 148 mm in total length, and 1 + and 2 + in age, respectively. The spawning of C. razii took place from late May to late August when the water temperature was between 19.7 and 22.8 ◦ C. At the beginning of the reproduction period, the average gonado-somatic index values were 10.0% ranging from 4.03% to 15.90% in ripe females. The estimated gonadal indices showed that the ripe males were ready to spawn earlier than females. The average egg diameter was 0.99±0.65, ranging from 0.2 to 2.3 mm. The averages absolute and relative fecundity were 4386±2174 and 66.3±37.8, respectively. The absolute fecundity was significantly related to body weight and gonad weight.

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里海盆地南部Sefidroud河斑螯蟹的年龄、生长、性别比、产卵季节和繁殖力

通过一年中的每月采样，研究了来自里海南部流域Sefid河的特有塞浦路斯物种Capoeta razii的生殖生物学的某些方面。估计了年龄、生长、性别比、产卵季节、繁殖力、性腺体细胞、改良性腺体细胞和多鱼指数。性别比（F:M）为1.00:2.63，男性的比例大于女性。成熟雄性和雌性的总长度分别超过88和148mm，年龄分别为1+和2+。拉齐C.razii的产卵发生在5月下旬至8月下旬，当时水温在19.7至22.8之间◦ C.在生殖期开始时，成熟雌性的性腺-体细胞指数平均值为10.0%，范围为4.03%至15.90%。估计的性腺指数表明，成熟的雄性比雌性更早做好产卵的准备。平均卵径为0.99±0.65，范围为0.2至2.3mm。平均绝对繁殖力和相对繁殖力分别为4386±2174和66.3±37.8。绝对繁殖力与体重和性腺重量显著相关。

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来源期刊

Iranian Journal of Ichthyology Agricultural and Biological Sciences-Aquatic Science

CiteScore

0.70

自引率

0.00%

发文量

期刊介绍： Iranian Journal of Ichthyology (IJI) is a peer-reviewed journal for publication of high quality papers on any aspect of ichthyology and will be published 4 times a year by the Iranian Society of Ichthyology (http://www.isi-org.ir). The journal welcomes the submission of manuscripts that meets the general criteria of significance and scientific excellence, and will publish original scientific articles in the fields of ichthyology. The editors welcome the submission of original manuscripts including Research Articles, Short communications, and Views & News. Review papers by distinguished authors and Special Issues will also be considered. It is our aim to provide the international scientific community with an efficiently published journal, meeting high scientific and technical standards. Scopes of Iranian Journal of Ichthyology includes: Systematics, taxonomy, morphology, anatomy, biogeography, biodiversity, conservation, ecology and general biology of fishes (reproduction, food and feeding habits, age and growth, population dynamics, etc.). Papers on freshwater, brackish, marine and fossil fishes will be considered.