Reproductive biology of the invasive sharpbelly, Hemiculter leucisculus (Basilewsky, 1855), from the southern Caspian Sea basin

H. Mousavi-Sabet, A. Heidari, M. Salehi
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引用次数: 6

Abstract

The sharpbelly, Hemiculter leucisculus , an invasive species, has expanded its range throughout much of Asia and into the Middle East. However, little is known of its reproductive information regarding spawning pattern and season that could possibly explain its success as an invasive species. This research is the first presentation of its reproductive characteristics, which was conducted based on 235 individuals collected monthly throughout a year from Sefid River, in the southern Caspian Sea basin. Age, sex ratio, fecundity, oocytes diameter and gonado-somatic index were calculated. Regression analyses were used to find relations among fecundity and fish size, gonad weight (Wg) and age. The mature males and females were longer than 93.0 and 99.7mm in total length, respectively (+1 in age). The average egg diameter ranged from 0.4mm (April) to 1.1mm (August). Spawning took place in August, when the water temperature was 23 to 26°C. Average gonado-somatic index values for females at the beginning of the reproduction period (March) and in ripe mature spawning females (August) were 2.90% and 16.97%, respectively. The averages of absolute and relative fecundities were 19978.6 and 607.1 eggs, respectively. The absolute fecundity was significantly related to body weight, ovary weight and age. A potentially high reproductive capacity, comparatively small eggs, short time of eggs’ development, fast sexual maturation, short life span, tolerance to a wide range of environmental conditions, all promote the invasion of this invasive sharpbelly in freshwater ecosystems of the temperate climate zone.
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来自里海南部盆地的入侵性尖腹蛛——白纹半壳蛛(Basilewsky,1855)的繁殖生物学
尖腹蛛是一种入侵物种,其范围已扩展到亚洲大部分地区和中东。然而,人们对其产卵模式和季节的繁殖信息知之甚少,这可能解释了其作为入侵物种的成功。这项研究首次展示了它的繁殖特征,该研究基于一年中每月从里海南部流域的Sefid河采集的235只个体。计算年龄、性别比、繁殖力、卵母细胞直径和性腺体细胞指数。通过回归分析,发现鱼的生殖力与体型、性腺重量和年龄之间的关系。成熟雄性和雌性的总长度分别大于93.0和99.7mm(年龄+1)。卵的平均直径在0.4mm(四月)至1.1mm(八月)之间。产卵发生在8月,当时水温为23至26°C。生殖期开始时(3月)雌性和成熟产卵雌性(8月)的平均性腺-体细胞指数值分别为2.90%和16.97%。绝对繁殖力和相对繁殖力的平均值分别为19978.6个和607.1个卵子。绝对繁殖力与体重、卵巢重量和年龄显著相关。潜在的高繁殖能力、相对较小的卵子、卵子发育时间短、性成熟快、寿命短、对各种环境条件的耐受性,都促进了这种入侵性尖腹蛛对温带淡水生态系统的入侵。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Iranian Journal of Ichthyology
Iranian Journal of Ichthyology Agricultural and Biological Sciences-Aquatic Science
CiteScore
0.70
自引率
0.00%
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0
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.
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