Table of Contents
Dataset Papers in Biology
Volume 2013 (2013), Article ID 607541, 6 pages
http://dx.doi.org/10.7167/2013/607541
Dataset Paper

Reproductive Dynamics of Iheringichthys labrosus (Lütken, 1874) (Teleostei, Pimelodidae), in the Capivara Reservoir, Paranapanema River, Parana, Brazil

1Grupo de Pesquisa em Ecologia e Revitalização de Ambientes Aquáticos, Departamento de Biologia, Setor de Ecologia, Universidade Federal de Lavras, Campus Universitário, Caixa Postal 3037, 37200-000 Lavras, MG, Brazil
2Departamento de Biologia Animal e Vegetal, Centro de Ciências Biológicas, Universidade Estadual de Londrina, Campus Universitário, Caixa Postal 6001, 86051-990 Londrina, PR, Brazil

Received 22 March 2012; Accepted 17 April 2012

Academic Editors: S. Fenoglio and P. Tryjanowski

Copyright © 2013 Fábio Mineo Suzuki et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

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 that I. labrosus reproduces 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.