Scholarlink

<p>This study provides information on the reproductive traits and population parameters of <i>Pyrrhulina australis</i> (Lebiasinidae). Field work was conducted monthly between February 2009 and January 2011, along littoral zones and marginal lakes of the Paraguay River, Porto Murtinho subregion, in the southern Pantanal, Brazil. Fish were sampled using a nonstandardized seine net and sieves. The female–male sex ratio was 1.06: 1 and differed significantly among size classes. No significant variation was observed in the length–weight relationship between the sexes, and negative allometric growth was observed for both females and males. A nonseasonal pattern of reproduction was found with both mature and maturing females and males with high values of the gonadosomatic index throughout the year. Females and males differed significantly for <i>L</i><sub>50</sub>, with values of 23.4&#xa0;mm and 25.2&#xa0;mm, respectively. Mean absolute fecundity was 144.1 oocyte and was not related to female size, total weight, nor gonad weight. Mean relative fecundity was 0.28 oocytes per milligram of female total weight. Three to four peaks in the oocyte size class frequency distribution evidenced multiple spawning. Our results point to an opportunistic reproductive strategy featuring high fecundity, small <i>L</i><sub>50</sub>, multiple spawning, and continuous reproductive activity. Ornamental use of the species is briefly discussed.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Life history traits of the pencil fish Pyrrhulina australis(Characiformes), an ornamental species from southern Pantanal wetlands, Brazil

  • 期刊论文

  • 发表日期：

    2025年6月9日

查看全文
  • Karina Keyla Tondato-Carvalho,
  • Vinicius Renner Lampert,
  • Fernanda dos Passos Dias,
  • Patrícia Luna Rondon,
  • Yzel Rondon Súarez

摘要

This study provides information on the reproductive traits and population parameters of Pyrrhulina australis (Lebiasinidae). Field work was conducted monthly between February 2009 and January 2011, along littoral zones and marginal lakes of the Paraguay River, Porto Murtinho subregion, in the southern Pantanal, Brazil. Fish were sampled using a nonstandardized seine net and sieves. The female–male sex ratio was 1.06: 1 and differed significantly among size classes. No significant variation was observed in the length–weight relationship between the sexes, and negative allometric growth was observed for both females and males. A nonseasonal pattern of reproduction was found with both mature and maturing females and males with high values of the gonadosomatic index throughout the year. Females and males differed significantly for L50, with values of 23.4 mm and 25.2 mm, respectively. Mean absolute fecundity was 144.1 oocyte and was not related to female size, total weight, nor gonad weight. Mean relative fecundity was 0.28 oocytes per milligram of female total weight. Three to four peaks in the oocyte size class frequency distribution evidenced multiple spawning. Our results point to an opportunistic reproductive strategy featuring high fecundity, small L50, multiple spawning, and continuous reproductive activity. Ornamental use of the species is briefly discussed.