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首页> 外文期刊>Dataset Papers in Science >Reproductive Dynamics ofIheringichthys labrosus(Lütken, 1874) (Teleostei, Pimelodidae), in the Capivara Reservoir, Paranapanema River, Parana, Brazil
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Reproductive Dynamics ofIheringichthys labrosus(Lütken, 1874) (Teleostei, Pimelodidae), in the Capivara Reservoir, Paranapanema River, Parana, Brazil

机译：巴西巴拉那帕内玛河卡皮瓦拉水库的黑鸢尾鱼（Lütken，1874）（Teleostei，Pimelodidae）的生殖动力学

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摘要

To study the reproductive dynamics of the mandi-beiçudo,Iheringichthys labrosus, in the Capivara Reservoir, Paranapanema River, Parana, Brazil, specimens were captured trimonthly from March 2001 to July 2004 at four sampling sites. The sex ratio showed a predominance of females in most of months sampled and the larger length classes. The majority of the individuals captured showed a standard length between 16 and 22 cm, with a maximal length of 27.5 cm. The size at first maturity was estimated to be 18.1 and 19.7 cm for females and males, respectively. Analysis of the temporal variation of the gonadosomatic index (GSI) and frequency of occurrence of gonadal maturation stages of males and females for the months sampled showed thatI. labrosusreproduces during the whole year, with peak reproduction in November and December. There was a positive correlation between the mean values of GSI and variation in rainfall values, suggesting that this abiotic factor can influence the reproduction of this species. The mean absolute fecundity was 67274.5 ± 16562.5 oocytes, and the mean relative fecundity was 350.6 ± 186.3 oocytes per gram of total weight.
机译：为了研究巴西帕拉纳帕拉纳帕内玛河卡皮瓦拉水库中曼迪贝索多的繁殖力，从三个采样点于2001年3月至2004年7月每三个月采集一次。在大多数月份的抽样调查中，性别比例显示出女性占主导地位，而长度类别则更大。捕获的大多数人的标准长度为16至22厘米，最大长度为27.5厘米。雌性和雄性的第一次成熟时的大小分别估计为18.1和19.7cm。对男性和女性的性腺体征指数（GSI）的时间变化和性成熟阶段发生频率的分析表明，I。 labrosus全年繁殖，11月和12月繁殖高峰。 GSI平均值与降雨值变化之间存在正相关关系，表明该非生物因子可以影响该物种的繁殖。平均绝对繁殖力为每克总重量的67274.5±16562.5个卵母细胞，平均相对繁殖力为350.6±186.3卵母细胞。

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